Charging Know-How
Are Battery Maintainers Safe to Leave Connected?
Are battery maintainers safe to leave connected? Learn when a smart maintainer can stay attached, what to check first, and when to unplug it.
Keep a parked car, bike or boat ready to start
We compare smart chargers and maintainers from NOCO, CTEK, Schumacher, Battery Tender, Optimate and Clore by amp rating, battery type and the vehicle they suit. Begin with what you drive, how long it sits or the battery under the hood.
Latest guides
Matchups & ReviewsBattery Tender 3 Amp Review
Battery Tender 3 amp review: see what its 6V and 12V support, float mode and included cables offer, plus how it compares with two smart chargers.
Matchups & ReviewsBattery Tender Junior vs Plus: Which One Do You Need?
Battery Tender Junior vs Battery Tender Plus: compare output, charging features and included cables to choose the right charger for your car, motorcycle or ATV.
Amps & Battery TypesBest 10 Amp Battery Chargers
Compare the best 10 amp battery charger options for cars, large batteries, storage and shop use. See which features and battery types fit your needs.
- Chargers by Vehicle
Best Battery Chargers for Diesel Trucks
Compare the best battery charger for diesel truck use, with picks for everyday charging, storage, 24V systems and high-current starting support.
Chargers by VehicleBest Battery Chargers for Motorcycles and Powersports
Find the best battery charger for motorcycle batteries, from everyday smart charging to lithium care and BMW-compatible socket charging. Compare 9 picks.
Chargers by VehicleBest Chargers for Multiple Batteries at Once
Compare the best battery charger for multiple batteries, from compact two-bank models to four-bank units. Choose by battery type, setting, and use.
- Maintainer & Charger Picks
Best Battery Maintainers for Winter Storage
Compare battery maintainers for winter storage by battery type, charging needs and number of vehicles. Find a fit for cars, motorcycles and seasonal storage.
- Maintainer & Charger Picks
Best Car Battery Maintainers for Cars That Sit
Compare the best car battery maintainer picks for cars that sit, including smart charging, battery compatibility, storage features and ways to choose.