Sulfatatsiya
If the battery long time is in the discharged condition, sulfate of lead turns into firm crystal substance which is quite difficult for transforming back to active weight at the subsequent charging.
"Sulfatatsiya" means not only process of this chemical reaction, but also its result.
It is possible to return such battery to a condition of operational readiness by means of very slow charging, but its capacity will be weaker, than earlier.
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