If your car is not used frequently then you ought to have a car battery maintainer. When not in use, the car battery loses charge on its own. It severely impacts the longevity of the battery and it dies prematurely.

So, one fine day if you wish to drive the car, you’ll have to first replace the dead battery. It will add up to your expenses even though your car is parked in the garage most of the time. A car battery maintainer is what you need to avoid such a situation. It ensures the sound health of your car battery even when not in use. It also ascertains the charge of the battery and charges it to the point it is thoroughly charged.

Now that you know the importance of a car battery maintainer, you’ve to decide which one is the best for your car battery. So, here we will discuss the best car battery maintainer and some tips to buy them.

Top 3 pick

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It revives the dead battery of your car. It is not always that after a battery has died, it has to be replaced. A car battery maintainer charges a dead battery and brings it to use. It will save your money and efforts of buying a new car battery. So, a maintainer will help you use the old dead battery by infusing life into it.

It increases the longevity of an unused car battery. The charge of a car battery drains out when it is not operative. Only discharging of the battery and no charging reduces its ideal lifespan. A maintainer keeps the unused battery conditioned and helps it retain the charge as well. Thus it prevents the premature failure of a battery by extending its life.

It ensures the good health of your car battery. A battery maintainer improves the performance of a car battery by conditioning it. It also keeps it in the topped-up condition. Also reduces the possibilities of damage to the battery that occurs due to various reasons.

It prevents overcharging of the battery. The best part of a car battery maintainer is that it can monitor the charge required by the battery. It only charges the battery until it gets charged fully and not beyond that.Overcharging is fatal for any car battery and this aspect is taken care of by car battery maintainers.



The source in which the battery maintainer draws power is an important factor to be considered. Most battery maintainers are mains-powered. They are simply plugged-in to an electrical power source using a cable. However, now we even have automated solar-powered battery maintainers in the market. They relieve you of long cables and the requirement of a power outlet. Solar-powered maintainers are convenient and environment-friendly but make you depend on the sun to charge the battery.


Not all maintainers are compatible with all types of car batteries. Car batteries come in different types and sizes. Usually, they are of either 6V or 12 V. Also, most conventional car battery maintainers are designed to charge lead-acid batteries. But nowadays, they can be used to charge AGM or Gel batteries. So ensure if the maintainer is fit to charge the type of car battery you use. It is advisable to select such a battery maintainer that can charge both 6V and 12V batteries.


Batteries hold a huge amount of charge and to handle it can be risky. Safety should be of prime concern whenever you buy a battery maintainer. Protection from electrical shocks and short circuit is vital. Reverse polarity protection warns you on connecting the charger to the wrong battery terminals. Even preventing overcharging of the battery is necessary to avoid risks of overheating and damage to the battery. Therefore, you must always look for maintainers equipped with these safety features.


The pace at which the maintainer charges the battery completely is another factor. The charging speed of the maintainer depends on its amperage. The more the amp of the maintainer, the faster will be the charging speed. However, it is a secondary consideration as maintainers with high amps are expensive. Moreover, maintainers with low amps use less power to charge the battery. Slow charging speed is also better for the long battery life.


Factors like after-sale services of the brand and terms of the warranty are also to be considered. These services and warranty create a sense of reliability in the brand. If battery maintainer brands offer long-term warranty then it says a lot about its quality and durability. Even though it is not an essential consideration, it is recommended to opt for maintainers that come with long term warranties.


Some other features of a battery maintainer that you must check while buying it:

  • Improvement in the performance of vehicles
  • Price
  • Thermal sensor
  • Battery desulfator
  • Automatic charging of modes
  • LED indicators



Product Name: NOCO GENIUS5, 5-Amp Fully-Automatic Battery Maintainer

Product Description: As the name suggests, this battery maintainer has some excellent features. It is compatible with both 6V and 12 V batteries. It is designed to charge almost all kind of batteries including lead-acid, marine, AGM, Gel, and lithium-ion batteries. It also works well with various kinds of vehicles including cars, motorcycles, boats ATVs, trucks, SUVs, etc. The best feature of the NOCO Genius5 5-Amp battery maintainer is that it an affordable, compact, and an all-in-one automobile device. Besides being a battery maintainer, it also acts as a battery charger, trickle charger, and battery desulfator. Its in-built thermal sensor can ascertain the nearby temperature and optimizes the charge. It helps to prevent overcharging of the battery in summers and undercharging in winters. It is equipped with reverse polarity protection and spark-proof features. From restoring dead batteries using repair mode to improving the lost battery performance, this battery maintainer works efficiently. It not only strengthens the engine for a powerful start but also enhances battery life.

  • Safety
  • Easy to use
  • Versatile
  • Value for money


Being a fully automated, safe to use, high performing battery maintainer, the NOCO Genius5 5-Amp has topped our list. It is a mains-powered 5-amp battery maintainer backed by a 3-year limited warranty. If you own more than one vehicle then it is the best battery maintainer for you. Designed to suit almost all kinds of batteries and different types of vehicles, it is a versatile battery maintainer. Its thermal compensation feature helps in accurate charging of the battery. It revives the dead batteries and improves battery performance. Overall this full-proof and dynamic battery maintainer is worth investing in.


All-in-one smart charger.
Integrated thermal sensor.
Compatible with multiple batteries and vehicles.
Safe to use.
Fully automatic.
Multi-mode indicators.
Compatible and handy.
Value for money.


May not work in some vehicles.
May be defective.

2) Battery Tender 12V Smart Battery Maintainer – 022-0165-DL-WH

Product Description: Our second pick is the Battery Tender 12V and 1.25 AmpSmart Battery Maintainer. It is equipped with dual independent charging banks that allow two car batteries to charge together. It is designed for maintaining and charging sealed, maintenance-free and flooded batteries, lead-acid and AGM car batteries.

Its temperature detector can sense the surrounding temperature and optimize the charging of the battery. It comes with a LED indicated 3-step charging feature including initialization, bulk charge, and float mode. Its in-built smart controller charges the battery safely and precisely to guard against overcharging. The spark-free and reverse polarity protection traits of this smart charger cum maintainer qualify international safety standards. Though it comes with a two-year warranty, it is costly and comes with shorter cables. If money is not a vital consideration for you then you can try this maintenance-free automatic battery maintainer.

  • Multiple battery compatibility.
  • Dual charging banks.
  • High amperage.
  • Advanced protection.
  • Integrated smart controller.
  • Triple charging modes.
  • Thermal detector.
  • Free of maintenance.
  • Very expensive.
  • Shorter cables.
  • Not suitable for modern car batteries

3) BLACK+DECKER BC2WBD Fully Automatic 2 Amp 12V Battery Charger/Maintainer

Product Description: The BLACK+DECKER BC2WBD fully automatic 2 Amp 12V Waterproof Battery Charger/Maintainer is the next in our list of best car battery maintainers. It is compatible with 12V AGM, Gel, and flooded batteries. It comes with high amperage and is developed to charge batteries of vehicles like cars, motorcycles, boats, RVs, ATVs, etc. Equipped with battery clips, ring terminals, and DC accessory, a three-way connecting feature makes it convenient and hand-free to use.

Its superior safety features include built-in circuit protection, reverse polarity, and overcharging protection. It is a completely sealed battery maintainer with an IP67 rating that safeguards against moisture, grease, and dust. Though the cords are shorter, it works well with extension cords. It is an ideal choice for cars that works in all weather conditions. With a limited warranty of just one year, this battery maintainer may not work after a few months of use. However, it is a very cheap battery maintainer with excellent safety guards and handy features.

  • High amperage.
  • Multi-battery installation.
  • Inexpensive.
  • Compact.
  • Easy to use.
  • Suitable for various vehicles.
  • High-quality protection.
  • Ideal for extreme weather conditions.
  • Not durable.
  • Shorter cords.
  • Limited warranty.


Q: When should you use a car battery maintainer?

A: The best quality of a car battery maintainer is that it can be used 24/7. Unlike a battery charger, you just need to plug in the maintainer to the car battery and it will do its job. It will keep the battery charged and topped-up. So even if the car is not in operation for months, a battery maintainer will not allow the battery to die and keep it in a healthy state. Moreover, when you’re plugging the maintainer for a long time, you can be carefree about the damage via overcharging.

Q: What is the difference between battery charge and maintainer?

A: Often people use the terms battery charger and battery maintainer interchangeably. However, the two are not the same. A battery charger just charges the battery irrespective of its charge holding capacity. So, the overcharging of a battery happens very frequently when you use a battery charger. Also, once fully charged, the battery also starts self-discharging. On the other hand, a battery maintainer does not only charge the battery but also helps it retain or maintain the charge. It eliminates the risk of battery overcharging by precisely charging the battery concerning its charge holding capacity.

Q: What happens when your car battery is overcharged?

A: A car battery is overcharged on account of unregulated charging beyond the capacity of the battery. It can overheat the battery thereby damaging the battery and its charger. There are high chances of a reduction in the ideal lifespan of the battery as a result of overcharging. Therefore, using a car battery maintainer is essential.

Q: What to do when your car battery dies?

A: When a car battery dies, its engine stops functioning. So your car will not start when the battery is dead. Many people think a dead battery becomes redundant and has to be replaced. However, charging the battery using a battery maintainer can restore it. Jump-starting the battery also works at times.

Final word

So, do not get confused if you decide to buy a car battery maintainer. Just got for the one that has the maximum features we discussed. Do not compromise with the safety features and make sure the maintainer is compatible with the car battery you use.

We hope our buying guide proves out to be beneficial for you! If yes, share your comments below!

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