The “memory effect” is perhaps the most famous issue associated with Ni-Cd batteries. Fortunately, with proper handling, it can be minimized or even reversed.
What Is the Memory Effect?
When a Ni-Cd battery is repeatedly charged without being fully discharged, it “remembers” a shorter capacity. Over time, the battery only uses that remembered part of its full charge range, decreasing runtime.
How to Prevent It
- Occasional Deep Discharges: Every 10–20 cycles, fully discharge the battery before recharging.
- Avoid Frequent Top-ups: Charging a battery that’s only partially used can accelerate memory effect formation.
Restoring Capacity
If a battery shows signs of memory effect:
- Fully discharge it under controlled conditions.
- Recharge it fully without interruption.
- Repeat if necessary (up to 2-3 cycles) to recover lost capacity.
Implementing these practices keeps your Ni-Cd batteries operating close to their original capacity for much longer.
