7 Best Battery Maintainer Reviews & Buyer’s Guide 2024

Alex Clarkson
Alex Clarkson

We all know how it can be frustrating to wake up to a dead car battery. If your battery ever dies, the first thought is to replace it often, or perhaps get the alternator in your car checked. However, you might be lucky sometimes, and you don’t even know it. Why? Well, you might be getting a depleted battery replaced, which is not necessary – and is just a waste.

Thus, to restore your depleted battery, you might use one of the best battery maintainers on the market. These are special chargers, which you use to restore the power of your car battery. Remember, batteries are delicate power supply resources, and you need to treat them as such, to ensure optimal performance and longevity. The charging process is a crucial aspect of improving the longevity and performance of your battery. You will need a trickle charger or battery maintainer at some point, especially if you leave the car in the parking for several days. 

In this guide, we have identified all the useful information you need to consider when buying the best battery maintainers .

Top 7 Battery Maintainer Reviews ​2024

Battery Tender 12 Volt Junior Automatic Battery Charger

Battery Tender 12 Volt Junior Automatic...
16,632 Reviews
Battery Tender 12 Volt Junior Automatic...
  • STAY CHARGED: Provides a full charge to your machine’s battery before...
  • EASY TO USE: Low maintenance design to be quick and easy to use, our universal...

Charge your battery the right way when you have the Battery Tender 12 Volt Junior Automatic Battery Charger. This unit provides a spark-proof lead connection to make it ideal for powering your favorite devices. It has a brain, is lightweight, compact, and fully automatic – making it suitable for use in small spaces.

On top of that, the charger does well to keep your battery fully charged such that its always ready to use. The battery even features a microprocessor, which will help improve the life of any lead-acid battery. These include the batteries you in RVs, boats, airplanes, automobiles, and more.

While this charge is compact in size, the heavy-duty design it has offers longevity. It also comes with durable components, which are spark and rust proof as well. Since it’s a smart charger, you are always sure of a reliable way to power your favorite batteries conveniently. 

The advanced technology helps bring the battery back to full charge, without any overcharging issues. The makers of this unit have also done well to include alligator clips for ease of set up. It also has a complete 4 step charging program, which includes initialization, bulk charge, float, and more. This allows for the optimization of battery power without overcharging issues. Even more, this unit has an automatic charge cycle function, which changes to float mode, once the battery is fully charged.

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The Good

  • Spark proof lead connection ad 12-foot output cord
  • Complete 4 step charging program for optimization of battery power
  • Automatic charge cycle function easily switches to float mode
  • Solid-state two-color LED indicates the stage of the charger

The Bad

  • It takes a few minutes to install correctly

BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer

BLACK+DECKER BM3B Fully Automatic 6V/12V...
  • Charges and maintains 12 volt and 6 volt AGM, GEL and WET batteries
  • Easy connection to vehicle battery using battery clips and O-ring terminals

BLACK+DECKER is one of the industry leaders when it comes to producing useful tech products. Thus, this is why we also recommend the BM3B Fully automatic battery charger as an excellent recommendation for your needs. It can charge and maintain 12-volt batteries with ease. Ease of installation is among some of the crucial factors to consider when you want to buy a battery maintainer. You need a charger that is simple to set up, even if you are still new to using battery maintainers.

 Thus, The charger allows for secure connections to your vehicle battery by using battery clips and O-ring terminals. Similar to most high end chargers you will find on the market, the BM3B also comes with smart functions, which improve the performance and functionality of the battery significantly. The charger will also stop charging automatically when the battery is fully charged or topped off. 

It then switches to float mode for monitoring purposes. Thanks to the unique AC low voltage compensation, this unit ensures optimal performance, even when used with an extension cord. 

There is nothing better than a device with electrical protection guards. Thus, this is why the BM3B battery charger comes with inbuilt protection guards, which help stop overcharging, reverse polarity, or short circuit issues.

The Good

  • Easy connection to vehicle battery using clips
  • Can charge and maintain 12 volt and 6-volt batteries
  • Inbuilt circuit protection stops overcharging
  • Mounting bracket for ease of set up

The Bad

  • It takes a few minutes to charge large batteries correctly

BMK 12V 5A Smart Battery Charger Portable Battery Maintainer

BMK 12V 5A Smart Battery Charger...

Charge like a professional when you have the BMK 12V 5A smart battery charger. This unit can diagnose to check for any defect before charging your battery. It has a 72-hour safety feature to start anytime when the charge is on. Thus, it helps protect the marginal cells from overcharging issues. The other crucial feature to consider when buying a battery maintainer is to check the design construction. Why? 

Well, because it helps determine the durability, it will offer resistance to materials such as plastic. Made using high quality ABS and IP65 waterproof material, this unit offers exceptional longevity benefits. It even features a constant pulse current maintenance function, which helps to stop overcharge and discharge issues.

It will also stop automatically once the battery charges ultimately. The inclusion of an LED indicator helps to display the different charging statuses of the charger. It’s an excellent choice for use in boats, cars, vehicles, electrical tools, and more. The fully loaded and burn-in test proves that this unit is highly reliable and efficient for use. The battery even has a contact pulse current maintenance function, to help stop overcharge and discharge complications.

The Good

  • Checks the battery conditions to check for battery defects
  • Comes with an upgraded 72-hour safety function
  • Made using high quality ABS and IP65 waterproof material
  • 4 stage smart charging and fully automatic charger

The Bad

  • The battery charger requires improved smart functions

NOCO GENIUS1, 1-Amp Fully-Automatic Smart Charger 

NOCO GENIUS1, 1-Amp Fully-Automatic...
  • Meet the GENIUS1 - Similar to our G750, just better. It's 35% smaller and...
  • Do more with Genius - Designed for 6-volt and 12-volt lead-acid automotive,...

Improve the longevity of your batteries significantly when you have the NOCO GENIUS1 Fully Automatic smart battery charger. This unit is compact, but it provides exceptional power four your needs. It’s an excellent maintainer for both the 6- and 12-volt lead-acid automotive, deep cycle batteries, and marine. More so, this charge lets you enjoy precision charging, all thanks to the inclusion of an integrated thermal sensor. The sensor can detect ambient temperature, and adjusts the charge to stop overcharging issues in hot climates.

Not only is the NOCO GENIUS 1 charger reliable for charging your batteries, but its also easy to set up. Yes, that’s right! Ease of use is among some of the crucial factors you should consider when shopping for battery maintainers. The markers of this unit have also done well to make it a smart charger. This way, you don’t have to focus entirely on the charging process, giving you the peace of mind to focus on other essential things. 

You will also find it easy to use to charge dead batteries. You can even leverage the all-new force mode that lets you take control, and manually start charging the dead batteries. Designed to be simple to set up and use, you will find this unit highly convenient for your needs. It is also fully automatic, thus giving you the peace of mind to focus on other essential things. The charger is powerful, and you can use it to charge lawnmowers, maintain cars, ATVs, trucks, SUVs, and more.

The Good

  • Comes with an integrated thermal sensor that detects ambient temperature
  • Charges dead batteries as low as 1 volt
  • Equipped with an all-new Force Mode for easy charging
  • Detects sulfation and acid stratification issues

The Bad

  • N/A

MOTOPOWER MP00205A 12V 800mA Fully Automatic Battery Charger/Maintainer

The MOTOPOWER MP00205A battery charger and maintainer is an excellent recommendation as well. The charger can charge all types of 12V lead-acid batteries, including the flooded or sealed maintenance batteries. More so, the charger is also fully automatic, and you just have to plug and leave it for the charging process.

A good battery maintainer also has a smart brain for your convenience. It is also microprocessor controlled to help you monitor the charging process. It will stop automatically when fully charged. Then, the charger will monitor the battery and maintain the battery with a float charging current.

This unit is also microprocessor controlled, such that you don’t have to worry about short circuits, reverse polarity, overcharges, and more. The charger also has a Constant Pulse Current Maintenance function, which helps to stop excessive charge and discharge issues. These are all functions that help to improve battery life and also improve recovery.

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The Good

  • Compact and durable battery design
  • Comes with a microprocessor-controlled program
  • Ring harness terminal connected permanently to the battery
  • Comes with Constant Pulse Current Maintenance

The Bad

  • Could have better alert functions for convenience

DieHard 71219 6/12V Shelf Smart Battery Charger and 2A Maintainer

DieHard 71219 2 Amp 6/12V Shelf Smart...
  • Micro processor controlled, fully automatic, 5-stage charging process for...
  • LED indictor will flash if clamps are reversed and charger will not operate

Charge your battery conveniently with the Diehard 71219 battery charger and maintainer. It comes with a powerful microprocessor, which controls the functionalities of the charger in many ways.

Furthermore, the charger also supports the 5 stage charging process for optimal charging and ease of monitoring. You will also appreciate the LED indicator with flash, which is an excellent safety mechanism. The charger also comes with battery maintaining functions, which help to stop overcharging.

The versatile and quick connect harness with 50A clamps make it easy to set up on the battery. The safety features are built to inform you of when the clamps are reversed to help stop overcharging complications. Also, the reverse hookup protection helps the device charge more safely and will shut off the charger when the braces are removed. 

The float mode monitoring helps to keep the battery at average voltage, thus maintaining optimal power.

The Good

  • Microprocessor controlled makes it easy to use
  • 5 stage charging process for quality charging
  • Comes with quick connect harness and 50A clamps
  • Works to stop overcharging when in use

The Bad

  • The charger warms up when used for long durations

Mroinge MBC010 Automotive Trickle Maintainer

Mroinge MBC010 Automotive Trickle...
  • Easy connection to motorcycles and vehicle battery using the included big...
  • Spark proof during lead connection, reverse polarity protection, overcharging...

With the Mroinge MBC010 Tricker Maintainer, you have a powerful battery charger for your specific devices. This unit has a smart brain, which does well to improve the power supply to your favorite devices. The smart brain means that this unit has a microprocessor for your power management convenience. 

 It even features four stages of battery charging, including initialization constant current, constant voltage, and floating charge. Also, the charger features a power-down memory function, such that it will restart the charging process automatically when you recover the main power.

On top of that, the charger does well to keep your devices fully charged, such that they are always ready to use. It even comes with a microprocessor-controlled structure, which will help extend the life of your devices. There is nothing better than when you have a dynamic and powerful battery maintainer for your needs. 

The charger should be flexible enough to charge the batteries on different cars, devices, and more. These include batteries used in ATVs, personal watercraft, golf carts, and more. The charger also monitors the charging time and battery capacity. You will find it easy to understand the charging time based on the capacity of the battery.

The Good

  • Microprocessor controlled battery maintainer
  • Suitable for various types of car batteries
  • 4 stage battery charging for the results

The Bad

  • Could use a better finish for ease of identification

BLACK+DECKER BC15BD Fully Automatic 15 Amp 12V Bench Battery Charger/Maintainer


The Black and Decker Brand knows how frustrating it can be to wake up to a dead battery. Therefore, this is why the BC15BD fully automatic maintainer is perfect for your needs. It comes with a patented 40A Engine Start Timer, which will optimize your battery power in a few minutes. Thus, you will have adequate power to start your cars, even when the battery is dead. More so, this unit is also completely automated, and it has as many as three charging options. 

It can switch in between the fast charge, the top off, and trickle charge when required. Thus, it ensures your battery always charges at the highest capacity, and in a short amount of time. You will also appreciate the several patented features on this unit, such as the alternator and dead battery voltage check. The gauge on this unit lets you view it through a large LCD screen, which displays different types of information. These include easy to understand icons, monitoring the electrical charge and even delivering alerts for incorrect connections 

Since this charge was developed with the end-user in mind, each of its functions is entirely automated. Most charge brands require customizing of many features such as the battery size and type. However, the BC15BD is simple to plug in and use.

The Good

  • Has a Patented 40A engine start timer
  • Can switch between charging states fast
  • Features an LCD screen for ease of use

The Bad

  • Features an LCD screen for ease of use

How to Find the Best Battery Maintainer

What Leads to Battery Depletion?

Various factors can lead to battery maintainer depletion. For instance, extreme temperatures, such as in the hot or cold, are common causes. Also, human errors are also a common culprit. For instance, when you forget to switch off your lights, thus leaving an interior light on for the night. Any frequent or short discharges can easily deplete your batteries. These include regular short journeys. Some batteries will also drain during the winter months when you don’t drive your cars.

By driving your car for a brief duration and then turning it off, the alternator won’t bear most of the charging load. Thus, all this will cause discharging, which can deplete the battery. Charging repeatedly is also another common complication. It might easily lead to sulfation, which can have harmful side effects on your battery.

Sulfation might occur when lead sulfate crystals accumulate in the battery fluids. Thus, this will compromise electrical conversion, which can also lead to depletion.

What is the Difference Between a Battery Maintainer and a Charger or Tender?

Battery tenders are chargers are different tools. A battery maintainer is much more efficient in functionality. However, chargers are also suitable for use. That said, there are instances where using a tender is a much better option. Just as mentioned before, tenders are equipped with sensory mechanisms. This means that they transmit energy as required. However, they stop delivering power once they achieve a full charge. If you are going to be parking your car for a while, then this solution is suitable.

That said, charges can operate indefinitely. You have to evaluate their use because they don’t come with automatic switch-off functions. 

 Also, leaving a charger hooked continuously can lead to overcharging if you are not careful. Thus, remember that overcharging is one of the main issues compromising the lifespan of your battery.

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What to Consider Before Getting A Battery Maintainer

Since you know the expected functions of these tools, you are ready to start shopping for your battery maintainer. Start with the following guide:

Types of Battery it Can Maintain

There are many types of battery in the consumer market. When shopping for a battery maintainer, ensure that it’s compatible with your battery. Also, consult with the user manual to determine the type of cell available in your car. Is the tender you have picked suitable for fluid or gel? Or is it ideal for lead-acid, lithium-ion, or even both?

Voltage and Amperage

Do you also need to determine the voltage amount your tender is rated at? If you care at 12 volts, then a maintainer with anything lower would not be useful. Also, consider the peak amperage. If the current level is excessive, you can run the risk of damaging the battery. Too weak, and the gadget will require a long time to produce a full charge.

How Many Batteries Can It Maintain at Once?

This is applicable when you have more than one vehicle in your parking. It’s not reasonable to buy two or more products. You can invest in a maintainer that can charge more than one car simultaneously.

Number and Type of Charging Modes

Some maintainers have more functions than others. If you want a no-frills tool, then consider going for one with a few features.

However, if you want more, then go for devices that have a larger power range. Will it be easy to sustain the absorption and floating charges?

Ideally, a battery maintainer should be a versatile tool. The better you can use it to compensate for changes, the less likely it will cause harm to your products.

Diagnostic Features

If you want to identify trouble before it starts, consider the maintainers that have diagnostic functions. This way, you can take action and work on potential issues before they start. Also, you will be able to identify issue such as discharging, battery damage or replacement dates conveniently

Safety Features

When using electricity in any form, safety should be an imperative. A good maintainer should have at least one of the following:

Spark resistant clamps

These clamps help to reduce the chances of fire. Also, you don’t want sparks flying around in your engine, which has gas. Even if some spark resistant materials can still spark, they are often not hazardous. More so, they don’t get as hot as the regular sparks.

Short Circuit Protection

This will help stop damage to the battery maintainer, in the likelihood of an overload. Without this, the charger will continue operation and can overheat.

Auto Voltage and Amperage

The auto voltage feature lets the gadget adapt to specific power supply needs. For instance, regulating the power output as the charge gets close to full.

Reverse Polarity Features

This is suitable for those of you who may have issues when trying to connect batteries. Usually, a battery has two terminals, which you need to consider. In the simpler batteries, there is one cable, which is meant for one of the terminals on the battery. Misconnecting the terminals, can lead to serious complications. It might blow primary fuses, or even cause damage to the main components of the battery maintainer.


Being able to charge your batteries, the correct way is essential. For the batteries that you have in cars, ATVs, boats, and more, you need one of the best battery maintainers on the market. These are powerful and easy to use tools, perfect for charging automobile batteries. You can use them to save lots of cash, instead of going for a new battery. Always check your battery for such issues before you consider buying a new one or getting a replacement.

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