It sounds like you have some corrosion on the terminals. Remove the batteries and with a good light source look at the springs and plates to make sure there is no corrosion. If there is remove it with crocus cloth. Check the batteries also for corrosion. If you find any remove it the same way. If after cleaning everything the batteries still will not charge get new ones as you probably have one or more which are shorted.
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hardrocko
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