About this replacement
Medion MD97110 / WIM2150 Series — 14.8V Li-ion Replacement Battery (BTP-D2BM)
This 14.8V, 4400mAh (65.12Wh) Li-ion cell replaces the BTP-D2BM and seven compatible OEM part numbers across the Medion MD97110, MD97710, WIM2150, and WIM-2150 series notebooks. It matches the original voltage rail, connector pinout, and BMS communication protocol. Install it when the factory cell no longer holds charge or the OS reports degraded health.
- MD97110 and WIM2150 platform fit: These models share the same 14.8V four-cell series architecture, identical connector housing, and BMS handshake sequence — which is why one part number covers all of them. The BTP-DOMM, BTP-CMBM, BTP-CNBM, BTP-CWBM, 40026269, 40029779, and 40027608 references all cross to the same physical cell format.
- Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on an MD97110 unit. The BMS negotiated correctly with the BIOS on first connection, charge current stabilised at the expected rate, and the cell reached 14.8V at termination with no fault flags thrown.
- First-cycle calibration on the MD97110: After fitting this battery, discharge the laptop fully until it hibernates, then charge uninterrupted to 100% before unplugging. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the MD97110 shuts down at 20–30% after a battery swap
The MD97110 BIOS tracks discharge curves from the previous cell and maps percentage readouts against that stored data. When you fit a new cell, the old curve data is still in memory and no longer matches actual cell voltage behaviour. Under full CPU and display load, the new cell hits a voltage point the BIOS interprets as near-empty — even when capacity remains. Running two to three full discharge-to-hibernate cycles teaches the fuel gauge IC the correct voltage-to-capacity curve for the new cell and resolves the early shutdown.
BIOS shows the replacement battery as "unknown" or 0% on first boot
The EEPROM data embedded in the old battery pack included charge history, cycle count, and a Wh rating the BIOS used to identify the cell as trusted. A new cell ships with a clean EEPROM, which the BIOS reads as unrecognised on first boot. This is not a fault with the battery or the laptop. Power the system on with the charger connected, let it sit at the BIOS screen or desktop for five minutes, then run a full discharge cycle — the BIOS will write new baseline data to the cell and the gauge will display correctly from the next boot.