1. Sulfated plates.
2. Buckled Plates.
3. Internal Short-circuits.
4. Cracked Jars.
5. Clogged Separators.
Gravity Readings Unequal
1. Acid or moisture on top of battery, due to defective sealing, flooding, spilling electrolyte, loose vent plugs. This causes current leakage. Remedy: Find and remove cause.
2. Tools or wires on battery, causing short-circuits. Remedy: Tell driver to keep such things off the battery.
3. Electrolyte or acid added to cells giving the high gravity readings.
4. Electrolyte spilled and replaced by water in cells giving low readings.