It charges and maintains batteries, with a trickle charge feature that keeps your battery charged over long periods of inactivity. It works with all sorts of batteries - including lithium-ion, AGM and deep-cycle - and both 6- and 12-volt battery types. What makes the Genius1 so popular (besides its price) is its versatility. The NOCO Genius1 is currently the best-selling battery charger on Amazon, and there's little wonder why - not only is it a reliable automatic car charger that makes charging an easy and stable process, but it does it for only $30 or less. The efficacy and user-friendliness of the Battery Tender Plus have earned it a good deal of popularity on Amazon: it's currently the site's fourth best-selling car battery charger, with a rating of 4.7 out of 5 stars based on over 7,500 customer reviews. It's also cited as working well in extreme temperatures - both hot and cold.

It's easy and safe to connect and disconnect, spark-proof, and checks to make sure a connection is established before transmitting power. The 1.25 amps of power provided ensures a 'low and slow' charge, which is best for the health of your vehicle's battery. It even has a 'float' battery maintainer mode that will keep it at full power during periods of inactivity, compensating for the self-discharge associated with lead-acid batteries. It's an automatic charger, with a charge controller which means it will shut down on its own when your battery charge is full, preventing overcharging. The best overall charger for your vehicle's lead-acid battery is the Battery Tender Plus (it works with multiple types of lead-acid batteries, including absorbent glass mat and flooded). A charger that can power up a lead acid 12-volt battery in an SUV can do the same for one in a motorcycle, for instance. After all, most cars, motorcycles, SUVs, trucks and other road vehicles use lead-acid batteries, which are relatively resilient and inexpensive to manufacture.

When it comes to picking the best battery charger, the kind of vehicle you drive typically doesn't play a major role.

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