For secondary rechargeable batteries the stronger battery would charge the weaker one draining itself and wasting energy. Figure 2 unbalanced charging each battery draws less amperage as power passes through an increasing number of interconnecting leads.
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Charging 3 batteries in parallel. If you connect rechargeable batteries in parallel and one is discharged while the others are charged the charged batteries will attempt to charge the discharged battery. Check that your battery charger is set for charging at 12 volts. Draws 1795 amps draws 131 amps. With no resistance to slow this charging. If you have 3 batteries in parallel and force that through any in seriesthe series batteries will either restrict the maximum current flow or worseyou could be charging the series batteries which could cause them to failleakexplode. Figure 1 unbalanced charging a common yet inefficient way of charging batteries in parallel.
An example method of charging batteries in parallel is to use one branch of the parallel circuit to charge each battery with a single charger. Multiply the time anticipated to charge one battery by the total number of batteries. Connect the positive output of the charger to the positive terminal of the first battery and connect that positive terminal to the positive terminal of the second battery. Its never a good idea to have any batteries in series with a parallel set. For example if charging one battery normally takes three hours and you have five batteries linked in parallel the charging time will be five times three hours or 15 hours. Number of leads that separate your battery from the charger is equal for each battery.
The process is simple but as the capacity of the batteries increases depending on the number of batteries wired in parallel it can take twice the time to charge two 12 volt batteries and three times as long for three batteries.
Gallery of Charging 3 Batteries In Parallel
