Re: Battery melted around post
6.2V = 70% charge.
Since the batteries are 8 years old, I would replace them all.
Because the batteries are connected in series, the new battery would quickly acquire the performance characteristics of the other five when you replaced the others, it would need replacing also, or it would become the weakest link in the chain.
If you could find a good used battery, it would probably keep you running until you can replace the entire set. That way you wouldn't be sacrificing the cost of a new battery to buy time.
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