About this replacement
Innomed Heartscreen 80G EKG/ECG — 6V Ni-MH Replacement Battery (P-0466)
This is a 6V, 3500mAh Ni-MH replacement battery for the Innomed Heartscreen 80G EKG/ECG and Heartscreen 112B portable cardiac monitors. It replaces OEM part numbers P-0466 and R-0692-1. The battery sits inside a slim 214.23 x 23.57 x 22.56mm cell pack that slots directly into the device bay.
- Heartscreen 80G and 112B platform compatibility: Both models share the same 6V battery rail, connector pinout, and BMS handshake protocol — one cell pack covers the full range listed in the fit model data.
- Bench tested on actual hardware: We cycled this cell through the Heartscreen's charge IC and confirmed BMS communication, voltage hold at load, and correct charge termination without fault flags.
- Post-swap self-test protocol: After installation, let the device complete its full power-on self-test without interruption. The Heartscreen 80G runs a BMS verification sequence at startup — cutting power during that window triggers a false battery fault that sticks until the next clean reboot.
Why the Heartscreen 80G alarms low battery immediately after a confirmed full charge
The Heartscreen's BMS uses a threshold calibrated to the charge history of the cell it learned on. A new Ni-MH cell hasn't built that baseline, so the BMS misreads the internal resistance and flags a low-battery condition even at full charge. This clears after one complete charge-discharge cycle. Run the device through one full session to near-empty, then charge fully before clinical use — the alarm will not recur.
Device won't power on after the replacement battery sat in storage
Ni-MH cells self-discharge at roughly 1–2% per day. If the battery spent weeks or months in a warehouse, it may arrive below the Heartscreen's BMS recovery threshold — typically around 5.0V for a 6V pack. The BMS will refuse to boot rather than draw from a cell it reads as critically low. Connect the charger and leave it for a full uninterrupted charge cycle before attempting power-on. If the charge indicator stays dark after 30 minutes, disconnect and reconnect to force the charge IC to restart its recovery sequence.