Mitsubishi Replacement Battery The Mitsubishi 3V replacement battery is a lithium metal battery compatible with FX3U units only. This battery life is approximately 5 year when used.
Mitsubishi FX3U
FX3U CPU's are compatible with existing FX2N expansion modules as well as the new FX3U ADP expansion modules and may be used as a replacement for FX2N PLC's.