About this replacement
Amano MJR-7000 Series — 3.6V Ni-MH Replacement Battery (IR430850)
This 3.6V, 700mAh Ni-MH battery is the internal backup cell for the Amano MJR-7000, MJR-7000EZ, MJR-8000, and MJR810 time clocks. It holds the real-time clock and battery-backed RAM active during power outages. Without a functioning cell, the clock loses time and attendance data the moment mains power drops.
- MJR-7000 series compatibility: The MJR-7000, MJR-7000EZ, MJR-8000, and MJR810 share the same backup circuit board connector and voltage rail. All draw from the same 3.6V Ni-MH cell and use the same BMS handshake, so one cell covers the full lineup.
- Bench tested on actual hardware: We cycled this cell through simulated power-loss events on the MJR-7000 platform. The BMS accepted the charge cycle without fault codes, and the RTC held accurate time across repeated cutover tests.
- Data export before swap: Export all employee attendance records and punch data before removing the old cell. The MJR-7000 series stores attendance logs and employee profiles in battery-backed RAM — full power removal wipes that memory instantly.
Why the MJR-7000 loses all employee data after a battery swap
The MJR-7000 keeps attendance records and employee enrollments in volatile RAM, not flash storage. That RAM needs continuous voltage from the backup cell to retain data. The moment you pull the old cell and the board loses power, every record in RAM is gone — the swap itself is the wipe event. Export data to a PC via Amano's software before touching the battery compartment.
Clock shows wrong time after every power outage
If the MJR-7000 consistently resets to a default time after any mains interruption, the backup cell is no longer holding a usable charge. A depleted Ni-MH cell may still show some voltage on a multimeter but collapse under the load of the RTC circuit within seconds. Replace the cell and allow it to charge on the clock for at least 24 hours before the next power test. Confirm the RTC is holding by pulling mains power briefly and checking that the displayed time survives the gap.