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The author says: "Warning, You have to estimate how much water to add, Adding too much will cause it to leak/spit when being charged." There is no reliable way to estimate how much water to add. It depends at what degree the battery dried-up what obviously is unknown. It is only my guess to compare the weight of brand new battery, which probably will be not available, and the old one. The difference will be the amount of water to add.
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