About this replacement
Philips PageWriter TC70 — 10.8V Li-ion Replacement Battery (ME202C)
This is a 10.8V, 7800mAh Li-ion replacement battery for the Philips PageWriter TC70 portable 12-channel ECG machine. It slots into the same bay as the original ME202C and restores battery-powered cardiac monitoring in clinical settings. Capacity matches the OEM specification — 84.24Wh.
- PageWriter TC70 battery platform: The TC70 uses a single smart battery pack with a multi-pin connector that carries both power and BMS communication. The device reads cell chemistry, voltage, and cycle count from the pack at startup. A pack that doesn't handshake correctly triggers a battery fault before the ECG application even loads.
- Bench tested on actual hardware: We ran charge and discharge cycles on the TC70 BMS protocol and confirmed the protection circuit responds correctly to the device's charge IC. The pack passed OCP, OVP, and thermal cutoff checks before leaving the bench.
- First boot after installation: After fitting this battery, let the TC70 complete its full power-on self-test without interruption. The BMS runs a verification sequence at startup — cutting power mid-cycle registers a false battery fault that stays latched until the next complete reboot.
Why the TC70 reports a battery fault on a new cell
The PageWriter TC70 stores expected BMS parameters from the previous pack in firmware. When a new cell arrives with a fresh cycle count and different state-of-charge history, the device's battery IC may flag a mismatch. This is not a defective pack — it's the device applying a conservative validation threshold tuned for the original OEM cell. One full charge-to-discharge cycle re-calibrates the reported capacity and clears the fault flag. After that cycle, the TC70 reads the pack as verified.
Charge indicator stuck below 100% on the first fill
On the first charge after a new cell installation, the TC70 charge IC often applies a reduced termination threshold — the display may hold at 95–98% and stop climbing. This happens because the charge controller hasn't completed a learn pass on the new cell's internal resistance profile. Run one complete discharge followed by an uninterrupted full charge. After that pass, the charge IC adjusts its termination point and the indicator reaches 100% correctly.