- The LR52 / A640 is a mercury-free replacement for the MR9 cell that was commonly used in cameras and carriage clocks. Mercury cells are now banned because of toxicity and environmental fears.
- The LR52 / A640 cells produce 1.5 Volts, which is higher than the 1.35V produced by the original mercury cell. Most devices accommodate the small increase in voltage and function properly.
- Replacement For the following: PX640A, A640PX, EN640A, EPX640A, PC640A, LR52, 1126A, PX640, EPX640, V640PX, H-N, E640N, MR52, NR52, 1126MP
RM640 Battery is compatible with the following models:
PC640A, EPX640A, A640PX, E140, NR52, PX640AB, V640PX, MR52, 1105M, A640, RM640, RPX640, EN640A, 23-1515, EPX640, KX640, PX640A, 1126MP, E640, V640,
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