One method is to pickup the MTH wall charging unit. It has two plugs, the round one and the small square type. I think you can or should leave anything connected using that for over 12 hours first. If the batteries are that old, then best to just replace them with a BCR or another one. If you have specific model numbers, thn you can check MTH website to see when they were delivered. Anything 5 years or more and hasn't been chareged, will most likely need replaced though.
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