About this replacement
ADE ESW50-15 / STAN07 — 7.4V Li-ion Replacement Battery (BAT21)
This is a 7.4V 3000mAh (22.2Wh) lithium-ion battery for the ADE ESW50-15 and STAN07 portable medical devices. It replaces OEM part BAT21. The battery fits both models directly — same voltage rail, same connector, same BMS communication protocol.
- ESW50-15 and STAN07 compatibility: Both models run the same 7.4V power architecture and use the same BAT21 battery housing. The BMS on each device negotiates cell state via the same handshake — one replacement battery covers both.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on the ESW50-15 platform. The BMS accepted the cell without fault flags, and charge termination fired correctly at full capacity. No voltage sag was observed under normal clinical load.
- Post-installation self-test requirement: After fitting this battery, let the device complete its full power-on self-test without interruption. Medical devices run a BMS verification routine at startup — cutting power during this sequence generates a false battery fault that persists until the next clean reboot.
Device not completing boot sequence after battery swap
The ESW50-15 runs a BMS learn cycle during its first few power-on sequences with a new cell. If the device halts mid-boot or throws a battery fault immediately after installation, the BMS has not yet characterised the new cell's internal resistance and charge curve. This is not a fault with the replacement battery. Run one complete charge-discharge cycle without interrupting the boot sequence, and the BMS will clear the flag and proceed normally.
Low battery alarm triggering immediately after a confirmed full charge
This happens because the device's charge IC applies a conservative voltage threshold when it first sees a new cell — it hasn't yet mapped the cell's capacity curve. The alarm fires against an OEM-calibrated minimum that a fresh, uncycled cell can appear to breach on the first read. Run one full charge-discharge cycle to let the BMS calibrate against actual cell capacity. After that cycle, the low-battery threshold will read correctly against this cell's real charge state.