Replacement Battery for the Mitsubishi A1FXCPU - 3.6V 2100mAh Lithium

Protect stored programs, RAM, and real-time clock data on Eternacell, Mitsubishi, Interstate, Maxell, and other industrial control systems with this 3.6V 2100mAh lithium thionyl chloride (Li-SOCl₂) direct-replacement backup battery. It is built as a form-fit-function replacement for the original memory-backup cell, so it installs without rewiring, reprogramming, or controller reconfiguration.

This battery cross-references to Eternacell B9670MC, Mitsubishi A6BAT-MRBAT, Mitsubishi C52012, Interstate LIT5085, Maxell ER17/33WKP, and Mitsubishi A Series, plus 9 additional cross-referenced part numbers, giving you a single verified replacement across these part numbers. Match your existing OEM battery by part number or by the equipment it powers to confirm fit. Lithium thionyl chloride cells deliver a high energy density and an exceptionally low self-discharge rate, holding a stable 3.6V nominal output over long standby periods—ideal for the low-drain memory-backup duty this battery is built for. It is a primary (non-rechargeable) cell and should be replaced rather than recharged once depleted.

Technical specifications

• Chemistry: Lithium Thionyl Chloride (ER/TL/LS)
• Nominal voltage: 3.6V
• Capacity: 2100mAh
• Battery type: Primary (non-rechargeable)
• Application: PLC / industrial control memory backup
• Cross-references: 15 equivalent OEM part numbers