Anytime you connect 2 batteries together in parallel you risk shortening the battery life. If one is weaker the other will attemp to charge it. Charging them together or seperate wont change that. If you charge tem with 2 chargers you will have to disconnet the batteries from each other.
You can charge them both at once. If you use 2 chargers you will need to disconnect the batteries from each other every time.
https://www.gearseds.com/files/twobat_onechgr2.pdf
Its probably a little far for you but these guys were great to deal with and not afraid to give their opion.
Clark Welding Co
5843 Urbana Pike, Frederick, MD
(301) 694-6161
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