As some other people have mentioned, if you have batteries on both sides, you will get an error. Only 4 batteries can be charged at the same time and they must all be on the same side. The whole purpose of an 8 battery charger is kinda defeated when the other 4 can't even be stored in the unit while the other side charges. UPDATE: The seller has reached out to fix the issue. Looks like I have a bad block. No battery problems
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