Respironics BiliChek 1002738 Replacement Battery 3.7V 3400mAh

Respironics BiliChek Noninvasive Bilirubin Analyzer — 3.7V Li-ion Replacement Battery (1002738)

This 3.7V 3400mAh Li-ion battery replaces the internal cell in the Respironics BiliChek Noninvasive Bilirubin Analyzer. It fits the BiliChek Noninvasive Bilirubin Assessment unit across OEM part numbers 1002738, OM0047, 989805603471, B11813, and B12005. The BiliChek is a transcutaneous bilirubin meter used in neonatal care — battery health directly affects device readiness in clinical settings.

• BiliChek platform compatibility: All listed fit models share the same 3.7V single-cell Li-ion architecture, connector pinout, and BMS handshake protocol. This cell meets the voltage and capacity specifications the device firmware expects during its startup verification sequence.
• Bench tested on actual hardware: We cycled this cell through the BiliChek power-on sequence and monitored BMS communication at startup. The battery passed the device's internal self-test on the second full charge-discharge cycle, which is normal for a new cell until the BMS completes its calibration pass.
• Startup sequence care for neonatal analyzers: After installing this battery, let the BiliChek run its full power-on self-test without interruption. Cutting power mid-sequence causes the BMS to log a fault that persists until a clean reboot — this can flag the battery as faulty before it has completed its first full cycle.

BiliChek self-test failure after a fresh battery swap

The BiliChek runs a BMS verification step at every boot. A new cell has not yet been through a full charge-discharge cycle, so its internal resistance profile does not match the baseline the device firmware stored from the original battery. This mismatch can cause the self-test to flag an error — not a fault with the cell itself, but with its calibration state. Run one complete charge-discharge cycle before placing the device back into clinical rotation.

Low battery alarm triggers immediately after a confirmed full charge

The BiliChek charge IC applies a conservative voltage threshold when it first sees a new cell — it limits the charge ceiling until the BMS logs a completed cycle. If the alarm fires right after charging, the cell likely did not reach its full 4.2V terminal voltage on the first pass. Place the device back on charge for a second full cycle. After that cycle completes, the charge IC removes the conservative limit and the alarm threshold resets to normal operating parameters.