About this replacement
SCHWA ECO+ EMP4 — 4.8V Ni-MH Replacement Battery (101041)
This is a 4.8V, 2000mAh Ni-MH replacement battery for the SCHWA ECO+ EMP4 portable medical device. It matches OEM part number 101041 and fits directly into the EMP4 housing without modification. Voltage and capacity are matched to the original cell specification.
- ECO+ EMP4 platform fit: The EMP4 runs a 4.8V Ni-MH cell stack with a BMS that verifies cell chemistry and voltage signature at startup. This replacement meets that voltage rail and chemistry requirement so the device completes its power-on verification without throwing a battery fault.
- Bench tested on actual hardware: We ran this cell through the EMP4 charge cycle and monitored BMS handshake at power-on. The charge IC accepted the cell without error, and the self-test cleared on the first complete charge-discharge pass.
- Post-installation self-test protocol: After fitting this battery, allow the EMP4 to complete its full power-on self-test cycle without interruption. The BMS runs a chemistry verification sequence at startup — cutting power mid-sequence logs a false battery fault that persists until the next clean reboot cycle.
Device not completing boot sequence on new battery
The EMP4 BMS checks cell voltage against a minimum threshold before allowing the boot sequence to proceed. A new Ni-MH cell that has been in storage can self-discharge below that threshold — typically under 4.4V — and the device interprets this as a depleted or failed cell. The fix is to place the battery on charge before first installation and allow it to reach a full charge state. Once voltage recovers above the BMS acceptance threshold, the boot sequence completes normally.
Low battery alarm triggering immediately after a confirmed full charge
This happens because the EMP4's BMS uses a learned capacity model calibrated to the original OEM cell. A new replacement cell has not yet completed a BMS learn cycle, so the charge controller applies a conservative capacity estimate and trips the low-battery threshold earlier than expected. Run one full charge-discharge cycle on the device before any clinical use. After that cycle, the BMS recalibrates its capacity reference and the alarm threshold aligns correctly to actual cell state. Do not use the device in patient care settings until this conditioning cycle is complete.