Noco Genius G15000
- A powerful, professional grade battery charger and battery maintenance tool designed to recharge all types of batteries rapidly in workshops, garages or those you simply want the best.
Our first product is the ultra-safe NOCO Genius G15000 Pro Series smart battery charger, which uses some of the safest and most advanced technologies in the world. I mean, versatility alone is a sales pitch enough. After all, this charger is capable of running on automotive, marine, motorsports, recreational vehicle and deep cycle batteries. It’s hard to see how you won’t find multiple uses for this fantastic product. I also find the external support and rubber base to be incredibly beneficial.
The NOCO Genius G15000 UltraSafe Battery Charger is one of the most versatile battery chargers. It works with all types of 12 and 24 volt lead-acid batteries, including wet, gel, marine, deep cycle and standard automotive batteries. It also includes an advanced repair mode that helps increase the performance and longevity of batteries that have gone uncharged for long periods. Built as a smart and versatile deep cycle battery charger, NOCO’s Genius G15000 is capable of meeting the needs of Needs charge of virtually every RVer. With the ability to charge various types of batteries, from lead-acid to deep cycle, the Genius G15000 is unmatched in terms of adaptability. Other than that, the NOCO charger is a fully automatic model, so when plugged in it monitors and maintains the batteries without requiring external interaction.
The rubber base and external mounting of the best rv battery charger will also help you in this area. These two aspects will limit the risk of the product scratching or slipping on the surface. This is just another way to ensure that this device remains as durable as possible. But none of these features matter without the device having a smart battery. This battery ensures that the product uses the least amount of power required while increasing the life and overall performance of your RV battery. If those features weren’t enough to sell you, the device also comes with an LED indicator, X-connect battery clips, and built-in grommets. These included aspects make the device much easier to use.
Spark resistant and protected against reverse polarity, the NOCO Genius G15000 is also very safe to use. In common cases, the NOCO battery charger must charge the batteries and keep them at their full capacity. But if needed, RV enthusiasts can use the Genius G15000 to reactivate heavily sulfated batteries and save a few bucks on battery replacement. Therefore, for full-time motorhomes who like to keep their expenses low in the long run, the NOCO Genius G15000 is the best deep cycle battery charger. Since the NOCO unit has LED indicators, it is easy to determine the charging stage at any time. Best Deep Cycle Battery Charger in 2021
Schumacher SP1296 Battery Charger
- RELIABLE POWER: Delivers 2 Amp charge and maintain to car, boat, and power sport batteries; compatible with standard, AGM, and deep-cycle batteries
The Schumacher SP1296 battery charger and maintainer is intended for use with boat, motorcycle, and powersport batteries. It contains a 2A completely automatic charging and maintenance system to keep your stored batteries charged. The device also has a float mode and microprocessor-controlled multi-stage charging, which improves battery life and safety. A quick-disconnect harness, an LED indication, and auto voltage detection distinguish between six and 12-volt batteries are also included. The Schumacher SP1296 complies with DOE regulations and meets energy efficiency criteria. It’s small and light enough to hang on the wall, and it’s a low-cost, user-friendly solution.
With no buttons or switches, this is the perfect battery charger for everything from boats to lawnmowers and motorbikes. You can use it to charge and maintain the batteries or simply to retain it. Because it is very compatible with various battery types, you can use it to charge your normal, AGM, and GEL batteries. It also functions as a 6 volt deep cycle battery charger.
It has an inbuilt microprocessor controller. It incorporates a multistage charging method that promotes safety, precision, and battery life. It can also provide a layer of protection by automatically distinguishing between 6V and 12V batteries. You can also take advantage of its reverse hook-up protection, which will assist protect your battery and charger from damage. One issue with this device is that it may cease to function after a year of use. There have also been some concerns about the instructions being inadequate. Another problem is that the wire eyelets are too narrow for some screw post diameters.
BLACK+DECKER BC2WBD Fully Automatic
- 2 amp battery charger and maintainer is compatible with any AGM, GEL, or WET automotive or marine 12V battery
Thanks to its waterproof casing, Black + Decker BC2WBD is resistant to dust, oil, humidity, which allows it to maintain stable operation in various environments. Black + Decker’s 12V Deep Cycle Battery Charger is also light enough that the RVer can be moved quickly and effortlessly. In addition to this, BC2WBD offers up to three connection methods: DC accessory socket, connection ring, and battery clamps. For this reason, Black + Decker BC2WBD is considered the best deep cycle battery charger for standard rigs.
The Black & Decker Fully Automatic Waterproof Charge is a 2 Amp battery charger compatible with most battery types. It is ideal for people who are often outdoors or who enjoy recreational trips to the beach or boardwalk. Due to its water resistance and dust-proof casing capabilities, this charger bills itself as one of the longest-lasting battery chargers. The charger also comes with fully automatic frequency controls, which optimize performance when using extension cords. This charger requires additional research, depending on the vehicle you want to charge. One problem I have encountered is that the charger is not compatible with all types of batteries. The Black & Decker site is a bit misleading and the brand’s customer service is not very responsive. However, it is a durable charger if you have a typical car battery.
Because the BC2WBD is an automatic battery maintainer, you can leave it connected to your vehicle’s battery bank for long periods of time. With integrated circuit protection, the Black + Decker model is protected against overloads, short circuits, reverse polarity, etc. Interestingly, the Black + Decker BC2WBD has low voltage compensation and that is why it can deliver a maximum load when paired with extension cords. With a combination of a hanging hook and magnetic holder, the BC2WBD also proves to be very easy to set up. Available at a reasonable price, the Black + Decker Battery Charger fits the budget of the average RV enthusiast. To reassure its customers, Black + Decker gladly backs BC2WBD with a one-year manufacturer’s warranty that provides peace of mind.
As it incorporates a microprocessor that regulates the output power, the Schumacher SC1281 regularly optimizes the charging time and maintains the battery charge at the same time. The multi-step nature of its charging process means that the SC1281 also excels at increasing the life of the battery bank. Therefore, the charger made by Schumacher deep cycle battery is considered the best deep cycle battery charger for those who are concerned about the integrity of batteries. With the Schumacher SC1281, your batteries should last for many seasons before needing to be replaced.
Where this deep cycle battery charger really matters is its size. While it may be taller and heavier, it all adds up to its power and cargo-carrying capabilities. You get two great features when you use the Schumacher SC1281: a 30 amp fast charge or a 100 amp cranking shock to really get your battery back to maximum efficiency. It has a larger center display with giant, bold numbers so you know where your battery charge level is. The charger also comes with multi-stage charging and automatic voltage sensing to save you time and make your battery run faster. It is also quite portable, with an easy-grip handle.
Being compatible with typical batteries used in RVs, the Schumacher unit could charge AGM, gel and deep cycle batteries. This is why the SC1281 works quite well in a wide range of battery banks containing batteries of different types. Also, since Schumacher equips the SC1281 with voltage sensing, it can distinguish between 6V and 12V batteries when plugged in. Also, if the Schumacher battery charger notices reverse clamps, it will refuse to work until RV enthusiasts put the clamps in the correct polarities.
NOCO Genius G3500 Battery Charger And Maintainer
- The most versatile all-in-one battery charger any vehicle owner would need to quickly recharge its battery in hours, including cars, boats, trucks, RVS, tractors and much more up to 120 amp-hours.
The NOCO Genius G3500 is a must-have for all vehicle owners. You can charge your entirely exhausted batteries and get a few more years out of them with a promise of double the charging time. The NOCO Genius G3500 is capable of charging a wide range of battery cells. It can start and deep cycle 12V and 6V lead-acid cells in COLD/AGM mode, as well as 12V Lithium cells. You almost certainly have one like this stowed in your home or trunk, so give it a shot and find outdated batteries to be even more handy.
You may leave this battery charger unattended all year without danger of overheating or overcharging. Because it incorporates spark-proof technology with reverse polarity protection, this charger is regarded as one of the most advanced and safest on the market today. You’ll also appreciate the fact that it has an in-built diagnostic tool, so you won’t have to worry about open circuits or short circuits.
With the advantage of optimization and energy savings, you would have the advantage of knowing that this charger stabilizes the internal cell chemistry, allowing performance to be boosted and battery life to be extended. It also ensures that when you do not require full power, it consumes the least amount of energy. Based on the organic battery reaction, it will also make the appropriate changes.
You’ll soon realize that resurrection batteries doesn’t require miracles, only the NOCO Genius G3500. It is very easy to operate and has soft button pads for control and charging settings. You’ll discover how many batteries you have at home that only need a little prodding and pulsating from this battery charger to come back to life. The only disadvantage of the deep cycle marine battery charger is that most of the equipment must be purchased separately. The 12V male plug and eyelets are not included in the kit. Overall, it is a terrific investment that you should think about because of its advanced technology and energy-saving features.
Battery Tender Plus Charger and Maintainer
- STAY CHARGED: Provides a full charge to your powersports vehicle’s battery before switching to float mode to maintain proper voltage levels for safe, long-term storage without overcharging
Durable and easy to use, Battery Tender Plus 021-0128 is highly regarded by many RVers, from newbies to veterans. Capable of automatically switching to floating mode when the maximum capacity is reached, Plus 021-0128 could keep deep cycle batteries fully charged without overcharging. Additionally, Battery Tender’s battery charging is designed with top-notch temperature compensation, so its charge rate must remain constant regardless of ambient temperature. Possessing a lightweight body, Battery Tender Plus 021-0128 is also portable.
The Tender Plus 021-0128 battery charger is one of the most efficient chargers. It works fast to give your battery a fast and efficient charge. It also includes an automatic float mode to avoid overcharging the battery. Tender Plus 021-0128 is a 1.25 amp charger with 12 volt capacity. The display is simple and easy to read when in use, and the charger features anti-spark technology. Additionally, it is compatible with most types of batteries and is optimal for long-term storage if required. Due to its simplicity, this charger tends to flash a red warning light when not needed. This is a simpler battery charger model, which means there is no specific reading when a problem arises. Also, this charger is not forever. A year or two with that seems to keep it going until it’s done. It is a quick and simple charger, ideal for people who do not need all the flashy settings of the most complicated devices.
It also has a quick connect harness, making this product an easy process to use. This feature will simplify even the most difficult connections thanks to its design. Honestly, this quality can go a long way in some situations. You should also take advantage of the 10-year warranty on this charger. This number of years of warranty is not something you see often in this market. As a result, you can reasonably expect this manufacturer to assist you when or if something happens to the product. It is also advantageous that this charger automatically switches to floating charge mode when the battery is fully charged. In other words, this feature will ensure that you don’t overcharge the battery, which can lead to a lot of problems.
Thanks to the colored LED lights on the housing, determining the charge level with Plus 021-0128 is very easy. Also, if the battery voltage drops under load for any reason, the Battery Tender will switch to adaptive ISM charging and resume full power. Like other modern battery chargers, Battery Tender Plus 021-0128 has built-in protection that leads to a higher level of security. Since the Plus 021-0128 is a low-maintenance deep cell battery charger, RV enthusiasts don’t need to pay special attention to it. When it comes to post-purchase support, Battery Tender offers your unit a solid 10-year warranty. In case you want to purchase an insurance policy while shopping, Plus 021-0128 is the best deep cycle battery charger you can get.
- The world’s most advanced 12V & 24V battery charger! OptiMate 6 12V-24V is perfect for high performance starter & deep cycle batteries that demand temp. controlled charging & long term maintenance!
The Optimate 6 12V-24V Battery Charger is a perfect choice for anyone who needs a deep cycle battery charger. This product is perfectly suited to thrive in these circumstances with a set of features that will blow your mind. You see that this charger has the ability to charge a 12V or 24V battery and maintain the same performance in both situations. But the best part about this feature is that when / if you accidentally select 24V and charge a 12V, the device will notify you.
The durability of this OptiMATE 6 battery is perfect. Maintaining a 12V deep cycle, marine, automotive and motorcycle lead acid battery is easy and straightforward. The company also offers a 3-year limited replacement warranty. Additionally, multi-step desulphation helps restore the unattended battery to 0.5 volts. Ampmatic charge control helps to adjust current. It is more suitable for all battery sizes, such as 3AH to 240AH. It also includes a cell voltage balancing mode that appropriately designed new batteries to be used for the first time. In addition, it optimizes battery performance. This is ideal for safe electronic vehicle use. Automatic shutdown is the best feature Tecmate offers. This means that in the event of a short circuit or disconnection of the battery, the battery will automatically shut down. This will save your vehicle from any event.
BMK 12V 5A Smart Battery Charger
- 【UPGRADED DEFECTIVE BATTERY DETECT/FAST CHARGING CAR BATTERY BOOSTER】Updated with battery condition diagnose to detect the defective battery before charge. Input 100-240V AC, With 5A DC output current, BMK 12V 5A car battery charger is suitable for charging batteries with 15-100Ah. NOTE: To better tender the battery, please make sure the battery capacity is higher than 15Ah, it can also charge over 100Ah batteries, just more charging time. ETL Certified for performance and safety
The BMK BLUEMICKEY 12V 5A Smart Battery Charger comes with many features that can make your life easier. A good example is the fantastic harness in the product, which makes it very easy to disconnect and connect. Due to this, the whole process of use becomes simpler and easier to use. Many buyers have emphasized how little discomfort this product causes them. As someone who struggles with these tasks, you can bet you were delighted to see these kinds of accolades.
The BMK portable battery charger can take it wherever you want. It’s waterproof because it’s designed for use on boats, so you know it will perform very well in heavy rain or a dust storm. This model can charge batteries between 15 amp hours and 100 amp hours, although a higher Ah rating requires more time. It has a four-step smart charge and shuts down as soon as the battery is charged. This will extend the life of your RV’s battery. The built-in LED indicator lets you know the state of the battery before removing it, so you don’t disconnect the charger too soon.
This battery charger is smart enough to prevent you from damaging the batteries. It has strong overcurrent, overcharge and over discharge protections. The system also provides protection against overvoltage, overheating and short circuit. This is a rugged device that automatically changes its safety features when you plug it in and start charging the battery. Speaking of batteries, the only power supply and storage solutions that you can’t charge are lithium-ion batteries. Any type of lead-acid battery should be able to draw power with the BMK. To optimize the charging and retention capacity of the BMK battery, it is important to only charge batteries with a minimum capacity of 15 Ah.
This model has several built-in protection measures. It has reverse polarity protection, short circuit protection, overvoltage protection and overcurrent protection. It also has overload protections. It uses a constant pulse current during battery maintenance mode to avoid overcharging and discharging the battery. The manufacturer fully charges the battery chargers and performs combustion tests so you know that you will not burn out after the first few uses.
Platform owners should also like the security features of this product. I don’t see how anyone could be impressed with the spark-proof qualities of this product. This is another way for this model to ensure its performance meets user needs. The BMK 12V Deep Cycle Battery Charger will also check for proper connection prior to power-up. Prevent the device from operating in questionable situations to ensure its use is completely safe.
Noco Genius GEN1
- A 10 amp (10 amp per bank) on-board battery charger for charging and maintaining one 12-volt battery.
NOCO makes some of the most efficient and capable battery chargers on the planet. Take, for example, the brand’s Genius GEN1. This marine battery charger is a very compact device that can supply power to your deep cycle battery and maintain its optimal shape. This NOCO battery charger is equipped with the latest innovations in battery charging and maintenance. Its 10A rating allows you to charge your deep cycle battery up to two times faster than other marine battery charging systems. The gen1’s ingenious design allows it to manage your battery much more efficiently than other battery maintainers. The charger emits a high voltage pulse when it detects that your battery is low voltage, has lost capacity, or has developed sulfation. A commendable feature of the GEN1 is its feedback mechanism. It charges your battery at a constant rate without exceeding its capacity.
Using innovative charging technologies, NOCO’s Genius GEN1 offers twice the charging speed of traditional deep cycle battery chargers. So with the NOCO charger on your deck, you don’t have to wait too long for the battery bank to fully charge. Since it could stabilize the cell chemistry, Genius GEN1 lengthens the battery change interval. Also, if NOCO Genius GEN1 detects sulphation, loss of capacity, and the like, it would quickly apply high-voltage charges to restore cell quality.
With IP68 rating, the Genius GEN1 remains fully operational even after being submerged underwater for several hours, so water intrusion will be harmless. Other than that, with a low profile construction, the battery charger made by NOCO takes up negligible space. As a result, for year-round small RV owners, NOCO’s Genius GEN1 is the best deep cycle battery charger. Genius GEN1 is also protected against a variety of problems ranging from sparks to thermal leaks.
TowerTop 12V Fully Automatic Battery Charger
- Fast, Smart Battery Charger: The Battery Charger can charge all types of 12V Lead-acid Batteries, including GEL, AGM and STD. It is perfect for charging Automotive, Motorcycle, Marine, RV, PowerSport, Lawn & Garden, etc. Do not charge a frozen or dead battery that has gone below 3V.
The TowerTop Smart Battery Charger/Maintainer is capable of charging 12-volt lead-acid batteries, including AGM and gel batteries. It has an LCD panel with easy-to-read symbols that provide information like charging and battery status. It includes a Start Aid technology that optimizes the battery in just 120 seconds, which is sufficient to start most cars. It is also suitable for use on RVs, motorbikes, and lawnmowers.
The charging procedure on the device consists of seven steps: soft start, bulk charge, absorption, battery test, recondition, and floating. This protects the battery from damage and overcharging. It also offers a number of safety features, including as over-voltage, overheat, overtime charging, short circuit, and reverse polarity protection. The charger’s battery reconditioning feature even extends battery life.
TowerTop is a well-known brand known for its smart and inventive goods. Because TowerTop mostly sells gadgets, you should look at its deep cycle battery charger.TowerTop’s 2/10/25A 12V Smart Battery Charger can charge practically all varieties of 12 volt lead-acid batteries from all major brands. It has a 7-step charging schedule that is carried out automatically by the device. This charger introduces a safer and more optimal method of charging your auto battery.
If you have a cold battery, you can use this charger’s advanced start assistance feature to jump-start it in 2 minutes. The TowerTop 2/10/25A 12V Smart Battery Charger can also detect the remaining voltage on your battery, giving you an indication of its present status and charging performance. To make monitoring even easier, there is a small LED display on the front that displays all of the relevant information.
STANLEY BC25BS Smart 12V Battery Charger for Car/Marine Charging
- Dependable and safe to use; In an emergency, the 75-amp engine start helps jump start your vehicle in about 90 seconds
The STANLEY BC25BS smart battery charger can charge a vehicle in 90 seconds and is an excellent substitute for jumper wires. It can be utilized on boats, ATVs, motorhomes, and other vehicles with AGM, gel, wet, or marine 12-volt batteries that sit for extended periods of time. The smartphone has three charging stages and switches from rapid charging to trickle charging automatically.
The ETL-certified LCD panel indicates battery and charging status and is ETL-certified for safety and performance. One of the finest features of this device is that it charges up to 40% faster than standard chargers. With this gadget, you may test the battery voltage under load and see if the alternator is functioning properly. While the device claims to be able to start your vehicle’s battery in 90 seconds, it may require overnight charge to function properly. Also, when it’s chilly outside, the cords don’t flex very well.
ADPOW 5A 12V Automatic Smart Battery Charger Automotive Maintainer
- Intelligent Charging Mode: 7-stages automatic charging process [ Desulfation - SoftStart - BulkCharge - Absorbtion - TestMode - Recondition - Float] by MCU controller, the LED indicator provide visual feedback of battery capacity and diagnostic information accordingly, efficiently prolong the lifetime of the battery.
The ADPOW battery charger and maintainer has a seven-stage charging method that includes desulfation, soft start, bulk charging, absorption, test mode, reconditioning, and float. It is intended for use with automobiles, boats, RVs, lawnmowers, and other similar devices. It contains an LED indication that displays battery capacity and other important information, and it can fully charge depleted sealed lead-acid batteries. Because the charger is tiny, lightweight, and portable, as well as water- and dust-resistant, it may be used in a number of settings. Overall, it contains high-quality components that are well-fitting and finished. The quick-release couplings are convenient, and terminal cleaners are included as an added benefit. It also does not grow too hot when in use.
Adpow is another another brand from today’s list that specializes in automotive batteries and other related components. If you haven’t discovered the perfect battery yet, consider the following option.
Because it is both a smart charger and a battery maintainer, the ADPOW Automatic Smart Battery Charger is an excellent addition to your accessory kit. Because of its 7-step automated charging performance, it is ideal for even completely depleted 12-volt batteries. On the gadget, there is an LED indication that will provide you with visual feedback.
It is appropriate for a variety of 12-volt batteries, including SLA, AGM, VRLA, maintenance-free lead-acid batteries, and many others. As a result, it is a good choice for a variety of battery-powered devices, such as lawnmowers, electric vehicles, and RVs. The ADPOW 5A 12V Automatic Smart Battery Charger takes safety extremely seriously, as evidenced by the device’s numerous safety features. To keep the battery safe, there is short circuit protection, overload protection, overcurrent protection, and a variety of additional preventive measures. The smart deep cycle battery charger comes with a lifetime quality warranty from Adpow.
The lettering on the device is a little small and can be difficult to read. The instructions aren’t the best, and charging a battery may take longer than on comparable smartphones.
Buying Guide For The Best Deep Cycle Battery Chargers
Before you hunt for a deep cycle battery charger, you should first understand your battery. You will need to consider numerous parameters as well as the capacity of your battery in order to get the best deep cycle battery charger for your battery.
The battery type varies depending on the machine it is powering. A battery used in a two-wheeler vehicle, for example, is not the same as one used in a car or garden equipment. It is also critical to remember the current state of your battery. If your battery is entirely discharged, there are just a few chargers that can bring it back to life.
Monitor Charge Level Capabilities
If you despise the concept of your battery expiring a few hours before you expect it to, a charger that can monitor your battery’s charge level could be a lifesaver. When certain models detect that the charge level is becoming too low, they will automatically provide some more power.
It is another feature that will be somewhat more expensive; however, if you do not feel like checking the battery on a regular basis, this advanced sort of charger may be worth the extra money as a consumer.
Finally, the size of the battery should be taken into account. In the case of batteries, size is determined by the number of amp hours they can store rather than their physical dimensions. A typical amp hour on a battery is 50 amp hours.
A 10 amp charger will fully charge this 50 amp hour battery in six hours. Similarly, a 100 amp marine battery will take 11 hours to fully charge using the same charger. It is something you should consider before deciding which charger is ideal for you.
Frequently Asked Questions
What is a deep cycle battery charger?
It’s easy to understand what a deep cycle battery charger is. It is a charger intended for deep cycle batteries. As a result, these items have particular characteristics that make the job easier. A deep cycle battery charger, for example, will have thicker plates than a standard lead-acid battery charger. These plates will also be firm rather than spongy like those found on other battery chargers.
These characteristics differ on deep cycle battery chargers because they aid in charging your RV’s deep cycle battery significantly faster. Finally, these goods have a single purpose: to ensure that your RV’s battery is charged as efficiently and rapidly as feasible.
As a result, an RV owner’s primary goal should be to find the best RV battery charger. It may make your life on the road much easier while also ensuring that your RV’s battery never runs out of juice due to being undercharged.
How does a deep cycle battery charger work?
A deep cycle battery charger’s principal function is to recharge your RV’s battery to full capacity. It will also make every effort to guarantee that its charge rate is as efficient as feasible. And the better models will ensure that the device turns off when the battery is fully charged.
These are the most important features of the finest deep cycle battery chargers. Of fact, the actual procedure includes many more scientific terms, but these three functions provide a good overview of what you may expect from these products. We should highlight that some deep cycle battery chargers also function with various sorts of batteries; so, you may get more usage out of these devices than you anticipated at first.
What are the different types of Deep Cycle Battery Chargers?
There are various varieties of deep cycle batteries available on the market, just as there are several types of deep cycle battery chargers. They differ in numerous ways, including type, charging rate, amps, size, and so on.
You can select a unit that meets your needs and tastes from a variety of possibilities. This section will list all of the many varieties that may be found and seen on the market.
The first type is the charger, which is one of the most basic and popular sorts available. These types can be used generically, so you won’t have to bother about matching it with other amps, types, and so on.
Chargers function by repairing and revitalizing the power in your battery. They can even do this if your deep cycle battery is entirely depleted.
A restorer is a little more advanced sort of charger because it also has a cleaning function. The reception capacity of your battery is reduced when there are too many impurities and muck in its cells. As a result, it may not charge as quickly as other similar issues.
The restorer corrects this by breaking down the impurities that have accumulated over time. As a result, they are advised for professional applications or specialist shops, where deep cycle batteries are plentiful. On the other hand, restorers can be quite pricey.
Maintainers are intended to protect and maintain the charge of a deep cycle battery. As a result, the battery will not charge completely in one go. Because it only dispenses little amounts of energy, this helps to extend the life of your battery.
Aside from these basic varieties, deep cycle battery chargers that operate well with specialized deep cycle batteries are also available. When you have an AGM deep cycle battery, for example, a multi-stage charger is ideal. If you use gel batteries, float- or fast-charging chargers are also ideal. Deep cycle battery chargers vary in size as well. The size of your battery charger should be determined by numerous parameters such as charge rates, battery chemistry, and so on.
A good rule of thumb to remember is that higher the amps, the faster the charging rate. However, you should still consider the voltage of the battery, the power source, the battery type, and other aspects when selecting a device.