If a car battery fails, dangerous chemicals could leak. There's a low chance of overheating, but if a short develops, it may cause car batteries to fail. You're highly unlikely to end up with dead batteries, but a battery at 50-amp hours will take 24 hours to be fully charged.Ī 10 amp charger can charge a car battery in about 5 hours. While safe for your car battery, charging at 2 amps is very slow. The rule of thumb is, lower amps result in a slow charge and higher amps result in higher charging rate. Should I charge my battery at 2-amps or 10-Amps? Keep in mind that 20 amps is already fast charging, and repeated use of high charging amps may result in bad battery health.

Fast charging is not recommended for this type of battery, so stick to 10 amps for safety. How many amps do I need to charge a 12v battery?ĭeep cycle batteries at 12v cannot handle more than 30 amps of charge current. The higher the voltage, the faster a charge cycle is completed. This means that the alternator voltages and the vehicle charger voltages could safely get 15 volts while ensuring the battery won't get overcharged. You can charge your automobile battery at higher voltages as long as it's not yet fully charged. To increase the charge rate, you'll need at least 12.9 volts. Yes, you can safely charge a minimum voltage 12-volt battery with this amp rating, though it will be pretty slow. Charging within this range ensures the vehicle battery won't overcharge, overheat, or be damaged in the process. The safest amp to charge car batteries is from 4 to 7.5 amps. With too few amps, your car battery will take forever to charge! With too many amps, you risk overheating your battery, which may lead to an explosion. Knowing how many amps your car battery needs can be a lifesaver for your battery. So, what amp charger for a car battery is right for you? Is it a 2 amp or a 10 amp charger? Knowing what charger to use is also crucial in determining how long a full charge takes to avoid over charging or overheating. It's important for you to know how long your car's battery takes to fully charge, so you can plan ahead and not waste your precious time. This question has more to do with charge rate. After reading all the electric vehicle primers available online, you might think that you already know everything about the EV charging process - from the different types of chargers to the charging alternatives in the stickiest situations.īut, little is written about how many amps your car battery charger should REALLY be.

12v battery full charge voltage