It sounds to me, and I must add this disclaimer....I am an electrical novice, that there is some significant drain on the batteries, even when they are being charged, that is preventing them from fully charging. My gut says the problem is not the batteries, and that you must find what is discharging them as fast as they charge. Steve Ward is much sharper than I am on this, and perhaps he will tell me I am all wet, but it sounds to me like you have a short, or a really bad ground somewhere.
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