Im with you on that, the plates sulphate and film over with time and the ability to hold a charge gets to be less and less with time.....the plates also wrap with high current charges. I had an EE instructor put it in plain terms "Battery charging is like filling a wooden bucket with water,,,,you can fill it quickly with a firehose but you will never get it completely full and you will most likely damage each time you try....fill it with a trickle of water and it will fill to the top and last a lot longer."
I have also heard that if you run one completely down they will never hold a full 100% charge again
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