GP Dual Battery Charger with Extra Battery (1 Battery w/Charger)

when charging two 12-volt batteries in parallel it is important to remember that the voltage stays the same but the amp our capacity of the battery system increases this is important because the increase in battery capacity will affect charging time for example if you have a 40 amp hour automotive battery and a G 3500 it will take you roughly seven hours to recharge the battery if you add another battery in parallel the charging time will increase to around 13 hours here are some useful information when charging two batteries to 12-volt batteries form a parallel connection when the batteries are connected negative two negative and positive to positive the resulting system maintains a total output of 12 volts but increases the overall capacity the batteries can be charged at the same time by connecting to the end of the system in 12-volt mode or one at a time by connecting a battery char