Philips PageWriter TC10 Replacement Battery 10.8V 7800mAh

Philips PageWriter TC10 / TC20 — 10.8V Li-ion Replacement Battery (453564674191)

This 10.8V 7800mAh (84.24Wh) lithium-ion battery fits the Philips PageWriter TC10 and TC20 electrocardiograph series, including the TC10 Cardiograph and TC20 Cardiograph variants. It replaces OEM part numbers 453564674191, ME202EK, and U80221-4. This battery supports portable cardiac diagnostic use — patient transport, ward rounds, and locations without mains access.

• TC10 and TC20 platform compatibility: Both cardiograph variants share the same voltage rail, battery bay dimensions, and BMS handshake protocol. The 453564674191 part number covers the full platform. One replacement services all four models listed without modification.
• Bench tested on actual hardware: We ran this cell through the PageWriter charge cycle and monitored BMS communication throughout. The protection circuit responded correctly to charge termination, over-current events, and cell balancing across the full 10.8V nominal range.
• Post-swap self-test requirement: After installing this battery, allow the PageWriter to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup. Interrupting this sequence triggers a false battery fault that persists until the next clean reboot — it is not a cell defect.

Why the PageWriter TC10 alarms low battery on a freshly charged replacement

The TC10's charge IC applies a conservative acceptance threshold on first contact with a new cell. If the internal resistance signature doesn't match the learned OEM profile, the BMS flags the state-of-charge as unverified and triggers a low-battery alarm even at full voltage. This clears after one complete charge-discharge cycle, which allows the BMS to map actual cell capacity. Run the battery through one full cycle before clinical deployment — do not treat the alarm as a fault on first use.

PageWriter TC20 not completing boot sequence after battery replacement

If the replacement cell sat in storage before installation, self-discharge may have dropped it below the BMS recovery threshold — typically around 9.0V for a 10.8V nominal pack. The PageWriter boot sequence requires a minimum voltage to initialise the ECG acquisition board, and a cell below that threshold causes the device to stall or restart mid-boot. Connect mains power while the battery is installed and allow a supervised charge of at least 30 minutes before attempting a standalone boot. Check that the charge indicator is advancing before removing mains power.