In the right corner it's....Sir Gawain! He is nephew to King Arthur, and an honorable knight of Arthur's Round Table. He is very popular with the ladies, and quite charming. He is loyal to his king and queen and keeps his promises.
To charge the battery, the alternator voltage output has to exceed a minimum charging voltage. This minimum charging voltage is 13.8 volts dc across the battery terminals, or at the output of the alternator. A single lead-acid cell starts to charge at anything over 2.25 volts.ince a 12 volt battery has six cells, any 12 volt lead-acid battery needs at least 13.8 volts to start to charge. This voltage will be enough to fully charge or maintain the battery on a trickle charge, but charging time will be very long at 13.8 volts.
A 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. But there is a wide range of chargers with different charge rates on the market-from 2 to 10 amps. The higher the charge output, the faster a flat battery is recharged.f there is a power point handy, the battery can be left in the car, so long as the charge rate is only 3 or 4 amps. However, if the car has an alternator, disconnect the battery. beforehand: otherwise some alternators-generally the older type-can be damaged. If separate. caps are fitted, remove them for ventilation.