Multiple batteries?

[Mr V]

Originally Posted by engunneer

if your batteries were in parallel, then they would be providing a nominal 12V, but since the charge level of each battery will be different, it is not recommended. They fuller battery would be trying to charge the weaker one.

A better solution might be to have two parallel battery cables, but only use them for a moment while hot swapping. plug in a fresh battery and unplug the used battery, and you can keep going without a full reboot.

As long as the batteries are reasonably close in AH rating, SOC and general age there is no problem running a parallel battery bank though preferably you charge them as group too. Virtually every diesel powered truck on the road today runs a bank of at least 2 batteries connected parallel and sometimes 3 or 4 batteries on the larger trucks. They are of course permanently connected and charged as a bank, not individually and are replaced as a group with identical batteries.