1) The level of the electrolyte should be checked regularly and maintained above the plates. Topping should be done by distilled water; NOT ACID!
2) The accumulator should be charged when the e.m.f of the cell drops below 1.8 V and when the relative density of the acid is falls below 1.12 (using a hydrometer).
3) Large currents should not be drawn from the battery for a long time.
4) Should not be left in a discharged condition for a long period as sulphation may take place. (the lead (II) sulphate deposits on the plates harden up and cannot be converted back to lead (II) oxide and lead.)
5) Shorting/ overcharging of the accumulator should be avoided.
6) The terminals should always be kept clean and greased.
7) The accumulator should not be directly placed on the ground during storage. It should be rested on some insulator like a wooden block.
Wilfykil answered the question on April 15, 2019 at 08:12
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