In article ,
Jim DeClercq wrote:
In technical terms, you probably have a "sulfated" battery.
In car sizes, 5 amps for 24 hours should get it charging in the
right direction. Smaller battery, less current. It will take a
while. You will be forming the battery, giving it its initial
charge.

If the battery is sulphated, most modern chargers won't deliver enough
volts to get anywhere near 5 amps due to the high cell resistance. Many
are voltage limited to perhaps 14 volts or so, and might need several days
to get any result - if ever.

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*I don't have a solution, but I admire your problem. *

Dave Plowman London SW
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