About this replacement
Medion MD97860 / MD97288 Series — 14.4V Li-ion Replacement Battery (BTP-D4BM)
This is a 14.4V 4400mAh Li-ion battery replacement for the Medion MD97860, MD97288, MD97447, MD98160, and 19 additional Medion notebook models. It matches the OEM voltage rail and connector footprint for the BTP-D4BM and BTP-D5BM part numbers. Capacity is 63.36Wh, sourced from product data — not estimated.
- MD97860 / MD97288 platform fit: These Medion notebooks share a common 14.4V battery bay, connector pinout, and BMS handshake protocol across the listed models. That shared architecture is why one cell covers the full range without adapter or modification.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on a Medion platform, confirming the BMS accepted the new cell, reported state-of-charge correctly, and did not trigger a protection fault at either end of the voltage range.
- Post-install calibration on Medion notebooks: After fitting this battery, run the notebook down to hibernate cutoff on battery alone, then charge uninterrupted to 100% without use. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting poor battery health immediately after fitting a new cell
The Medion BIOS reads health data stored in the battery's EEPROM, not live cell voltage. When you fit a new cell, that EEPROM carries no charge history, so the BIOS flags it as degraded or unknown. This is a data mismatch, not a fault with the cell. Run one full discharge-to-hibernate then a full uninterrupted charge — the BIOS learn cycle rewrites the health register against the new cell's actual performance. After one complete cycle, the health indicator normalises.
Laptop shuts off at 20–30% charge shown on the fuel gauge
This happens when the fuel gauge IC still holds calibration data from the old, degraded cell. It maps the new cell's voltage curve incorrectly, so what reads as 25% is actually near the cutoff threshold. The result is an abrupt shutdown rather than a low-battery warning. Force a full discharge to hibernate, let the system power off completely, then charge to 100% in one session — this forces the fuel gauge IC to recalibrate against the new cell's actual voltage profile, restoring accurate percentage readings.