Re: Charging a dead battery
It's not a good idea to fill water before charging.
When you drain current from the battery, the electrolyte goes into the porus lead, make lead sulfate, and the "water" level will sink. When you charge the battery, the lead sulfate is made into lead and sulfuric acid again. And the "water" level will rise again, but because of heat generated while charging, some water will evaporate.
If you top up water before charging, the added excess "water" will come out through the vents and your acid Will become weaker (a new battery Will measure 1,28 to 1,30 kg/liter)
If you have a dead battery, check the density og the acid, charge with 2,8volts/cell and low current for three days and check again.
If the density has risen, but is below 1,28: charge for a week, check and full water.
If density stays the same after three days: get a new battery.
Rune Waltoft from Norway
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