• A 6-volt and 12-volt battery charger and maintainer for lead-acid and lithium-ion batteries up to 120 amp-hours
  • An ultra-safe design featuring spark-proof technology, as well as reverse polarity and overcharge protection
  • Safely charge automotive, marine, RV, powersport and lawn & garden batteries, as well as, AGM and deep-cycle batteries
  • Actively monitors the batteries health and repairs discharged and sulfated batteries for improved battery life
  • Charge a motorcycle, snowmobile, ATV, personal watercraft, lawn mower and more, or simply maintain all types of vehicles

NOCO Genius smart battery chargers are some of the safest and most advanced on the market. One of our best, the G3500 3.5 Amp is designed to charge 6-volt and 12-volt lead-acid and lithium-ion batteries up to 120Ah. It can also effectively maintain automotive, marine, RV, powersport, lawn & garden and deep-cycle batteries. It charges 2x faster than ordinary battery chargers, can repair damaged batteries and is designed for use with micro-hybrid start-stop vehicles and CANBUS electrical systems.

Guided by an onboard microcomputer, the G3500 monitors battery activity for safe and efficient charging, automatically minimizes energy consumption and provides redundant levels of safety protection, including spark-proof technology, as well as reverse polarity and overcharge protection. It can remain safely connected 24/7, while its streamlined design makes it ultra-compact, portable, and incredibly lightweight.

The G3500 features external mounting holes and a rubberized base that avoids surface slipping and scratches, while remaining impact, UV and water-resistant (IP65). Intuitive LED indicators provide visual state-of-charge feedback and diagnostic information, even when in maintenance mode. Designed for use on 120-volt 50-60Hz electrical systems, the G3500 includes both X-Connect battery clamps with integrated eyelet terminals, as well as a 5-year limited warranty.

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Capable of charging lead-acid batteries and lithium-ion batteries, the NOCO Genius G3500 can charge more types of batteries than other chargers we reviewed. That’s why it’s the best.
The NOCO Genius G3500 is our pick for the best battery charger because of its versatility. It’s the only battery charger we reviewed that can charge and maintain 12- and 6-volt lead-acid batteries, as well as 12-volt lithium-ion batteries. And it does this in a more compact design than other battery chargers we researched.
A feature that we love is the 12-volt Repair Mode, which does more than just charge dead 12-volt batteries. It uses a progressive recovery method to restore lost charge capacities in heavily sulfated batteries. To put this in simpler terms, it can recover the battery’s ability to maintain a charge when the voltage has dropped to as low as 2 volts. Most chargers can’t save batteries that have dropped below 3 volts. The safety features of the G3500 are excellent as well, which is more important than with jump-starters because chargers are left unattended for hours at time. To avoid overcharging, this charger monitors the battery and charges only when the battery can be charged. This ensures that the battery doesn’t overheat. In addition, the reverse polarity protection feature ensures that you don’t damage the battery if you accidentally connect the clamps to the wrong connections – negative to positive or vice versa.