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Goeff is correct around 12v no load is half discharged. SLA batteries rarely get charged correctly and rapid charging when dead flat can cause seriously reduced life. Also the life of the battery (number of charge discherge cycles) is relative to the depth of discharge, i.e. the shallower the discherge the greater the number of charge discharge cycles over it's service life. The most important thing is to fully recharge as soon as possible after discharge, preferably immediately or within a couple of days.
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