- The LR52 / A640 is a mercury-free replacement for the RM640 / 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, RM640, MR9, EN640A, EPX640A, PC640A, LR52, 1126A, PX640, EPX640, V640PX, H-N, E640N, MR52, NR52, 1126MP
A640PX Battery is compatible with the following models:
E640N, E140, 1126MP, PX640AB, EPX640, MR52, PC640A, KX640, RM640, PX640, RM640R, PX640A, 23-1515, V640, 1105M, RPX640, EPX640A, A640PX, V640PX, NR52,