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Originally Posted by barry123400
...Today I charged two batteries on cars that have been sitting since spring to move them. Both batteries will take a limited charge but know they will not retain it and are shot but were perfectly good last spring.  |
A 'deep' discharge of a battery is VERY BAD. It will lead to 'sulfation' which reduces its capacity. Automotive batteries are meant to handle brief burst of high current, as in starting, and then an immediate recharge. They do not like to sit for long periods, slowly discharging.
http://www.batterystuff.com/tutorial_battery.html