About this replacement
Medion MD89560 / Akoya P6622 — 14.4V Li-ion Replacement Battery (BTP-DDBM)
This is a 14.4V, 4400mAh (63.36Wh) Li-ion battery for the Medion MD89560, MD98250, Akoya P6622, Akoya P6630, and over 25 additional Medion notebook models. It replaces OEM part numbers BTP-DDBM, BTP-DBBM, BTP-D8BM, BTP-D9BM, and related variants. The cell fits the original battery bay and connects through the standard multi-pin Medion notebook connector.
- Akoya and MD-series compatibility: These models share a common 14.4V four-cell architecture and the same BMS handshake protocol, which is why one cell covers such a wide range of Medion notebooks. The connector pinout and EEPROM communication spec are identical across this platform generation.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a Medion Akoya unit. The BMS accepted the EEPROM handshake without errors, charge current stepped down correctly at full capacity, and the protection circuit tripped cleanly at the low-voltage cutoff threshold.
- Post-installation cycle reset: After fitting this cell, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. Medion's BIOS battery-learn cycle resets against the new cell chemistry during this sequence, clearing the inaccurate health warning that appears after every cell swap.
BIOS reporting poor battery health immediately after fitting a new cell
When a Medion notebook reads EEPROM data from the previous cell, it flags the new battery as degraded because the stored cycle count and capacity history don't match the fresh chemistry. The BIOS hasn't yet run its internal learn cycle against the new cell, so the health percentage shown is meaningless. Run one full discharge to hibernate, then a full uninterrupted charge to 100%. After that single calibration cycle, the BIOS recalculates from the actual cell data and the false warning clears.
Laptop shuts down at 20–30% battery shown on screen
This happens when the fuel gauge IC is still calibrated to the old cell's voltage curve. Under combined CPU and display load, the actual cell voltage drops below what the gauge predicted, and the system hits an unexpected low-voltage cliff before the displayed percentage reaches zero. It is not a fault with the new cell — it is a calibration mismatch. Discharge fully to hibernate-cutoff twice in succession, charging completely between cycles, and the gauge IC will re-map its curve to the replacement cell's actual 14.4V profile.