SLA discharging

The recommended cut-off voltage during discharge depends on the size of the discharge current. Do not continue discharging to the point where the voltage drops below the recommended discharge cut-off voltage. If a storage battery that was discharged below the recommended discharge cut-off voltage is recharged, the storage battery may generate heat which could deform it or cause condensation to form on the battery casing due to the evaporation of moisture from inside the battery. Discharging below the recommended discharge cut-off voltage may also accelerate the deterioration of the battery’s performance characteristics.

Avoid over discharge, and charge the battery immediately after discharge. The instruction manual of the equipment should contain information telling the user not to over discharge the battery and to charge the battery immediately after the use of the equipment (discharge). Even if discharge of the battery is stopped before voltage decreases to such a level that the battery driven equipment stops being operational, deterioration of the battery may be accelerated by the so-called sulphation phenomenon if it is not recharged after use. The low voltage cut-off circuit should be designed so that it can completely cut off the discharge current including a weak current.