Philips BiliChek 1002738 Replacement Battery 3.7V 2600mAh

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

This is a 3.7V, 2600mAh Li-ion replacement battery for the Philips BiliChek Noninvasive Bilirubin Analyzer. It fits the handheld clinical analyzer used at the bedside to measure transcutaneous bilirubin in newborns. OEM part numbers 1002738, OM0047, 989805603471, and B11813 all cross-reference to this cell.

• BiliChek analyzer compatibility: The BiliChek uses a single-cell Li-ion pack with a specific BMS handshake tied to the 3.7V nominal rail. This replacement matches that voltage profile and connector pinout. Substituting a cell with a different discharge curve will trip the analyzer's low-battery threshold prematurely.
• Bench tested on actual hardware: We ran this cell through the BiliChek's power-on sequence and confirmed the BMS accepted the cell without a fault flag. Full charge was reached and the analyzer completed its internal self-test without interruption across multiple cycles.
• Post-swap startup protocol: After installing this battery, let the BiliChek complete its full power-on self-test without pressing any buttons or cycling power. The device runs a BMS verification at boot — interrupting it creates a false battery fault that sticks until the next clean reboot.

Why the BiliChek flags a low-battery alert on a fully charged new cell

The BiliChek's charge management IC stores a learned capacity model from the original OEM cell. When a new cell goes in, the BMS compares the incoming charge signature against that stored baseline. If the new cell's internal resistance or charge acceptance curve differs slightly, the IC interprets it as a degraded pack and raises a low-battery alert even at full charge. One complete charge-discharge cycle allows the BMS to recalibrate against the new cell's actual chemistry and clear the alert.

BiliChek powers off mid-measurement after battery replacement

New Li-ion cells have slightly elevated internal resistance in their first ten cycles. The BiliChek's optical measurement circuit draws a sharp current pulse during a reading — enough to cause a brief voltage sag on a new cell that hasn't been conditioned yet. The BMS reads this sag as a critically low-voltage event and cuts power to protect the cell. Run two or three full charge-discharge cycles before returning the device to clinical use; after conditioning, the cell's resistance drops and the sag falls within the BMS's acceptable window.