If electronic devices (e.g. sound system with USB) have been added to the car, a battery with a higher capacity than the one installed by the manufacturer may be needed.

The current that the battery can provide during start-up in cold environment (-17 C). The higher it is, the easier the start-up will be.

Car batteries with a system that automatically stops and restarts the engine. When the vehicle stops, the system turns off the engine. The battery must have sufficient energy reserves to reactivate the engine.