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My boat has a 12 volt trolling motor and the battery(1) does not last long in wind. If I install a second 12 volt battery and connect them in parallel, positive to positive and negative to negative, is there any advantage to having a cutoff switch between them and only using the first one until it gets weak? Is it better to use the current from both at the same time? I do not have any experience in this area. Thanks for any information! :)
use both at the same time if wired parallel. otherwise you'd just be carrying 2 batteries. If you run one down then switch to both the first would pull the second one down, sort of level off current so to speak.Quote:
Originally Posted by Olgrey
If you use the first one and then turn on the second one, the first one will try to drain power from the second like it was a charger.
Use them together. They will last longer.
Good morning Wannabe.