depends on the battery. Are they both starting batteries? Deep cycle? You're never supposed to combine different batteries. Are they the same age? Both good? I charge two batteries at once all the time thru the battery switch, mainly because I'm in a hurry and only have one good charger right now. Are they real low? Its best to charge them separately. Load test each one to determine the condition, check each cell with a volt meter to see if you have a problem. Are they just a little low? charge them together under low amperage.
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