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i want to merge 2 batteries socket of 4 AA 1.5v batteries , how can combine them to have 12v ?
Put them in serie. One red cable to another black cable. Glue the cases back to back.
Don't get confused by the clamps; I only used them for keeping things in place. Oh, my cases are for 3 batteries, but the procedure is aplicable to 4 batteries cases also.