· At full charge, the electrolyte specific gravity is 1.28 while at 50% of charge
considered the minimum serviceable condition, the specific gravity is
typically 1.22, in a typical situation. When the specific gravity drops to 1.10.
The battery is full discharged.
· Prevent contamination and also add to
the strength and rigidity.
· Include permanent flame arrester to prevent
accidental explosion from external sparks
· Have hydrometer built in for faster checking.