Still, the time it takes to charge a 12V car battery will depend on three variables: the battery capacity, charger output, and the state of discharge. As a rule of thumb, opt for a smart trickle ...

Removed discontinued Energizer 4 Amp Battery Charger + Maintainer, added Clore CHARGE IT! 4506 6/12V (6/2) Amp Smart Charger. Removed discontinued SUAOKI ICS7+, added NOCO genius5.

Therefore, a 1-amp battery charger will typically take 48 hours to fully charge a 48Ah battery (48Ah ÷ 1A), while a 2-amp battery charger will take 24 hours (48Ah ÷ 2A).