- 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
V640 Battery is compatible with the following models:
1105M, RM640, PX640AB, V640, EN640A, RPX640, E640N, E640, 960-0374, RM640R, EPX640A, EPX640, A640, MR52, V640PX, A640PX, 23-1515, 1126MP, KX640, PX640A,