![]() There are also causes other than short trips and cold weather which can affect the state of your battery. As the battery nears full discharge, the lights gradually grow dimmer and finally go out altogether. Theoretically, a fully charged battery, without taking in current from theįor about ten minutes, or the headlights for eight hours, and a heated rear window for 12 hours. ![]() The loads imposed on your battery may be gauged from the amount of current used by the various electrical components: headlights take about 8 to 10 amps, a heated rear window about the same. Fast charging, however, is undesirable as it can buckle the The higher the charge output, the faster a flat battery is recharged. An average car battery has a capacity of around 48 amp hours which means that, fully charged, it delivers 1 amp for 48 hours, 2 amps for 24 hours, 8 amps for 6 hours and so on.Ī basic charger usually charges at around 2 amps - and so needs 24 hours to deliver the 48 amps needed to fully charge a flat, 48 amp hour battery.īut there is a wide range of chargers with different charge rates on the market - from 2 to 10 amps.
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