About this replacement
HP Mini 210-3000 / Pavilion DM1-4000 — 11.1V Li-ion Replacement Battery (646657-251)
This is an 11.1V 4400mAh (48.84Wh) Li-ion battery for the HP Mini 210-3000, Pavilion DM1, DM1-4000, and Mini 110-4100 series netbooks. It replaces OEM part numbers 646657-251, 646657-241, 646755-001, HSTNN-DB3B, HSTNN-LB3B, MT03, MT06, and related HP part codes. Physical dimensions are 202.10 x 50.70 x 21.50mm — check yours before ordering.
- Mini 210-3000 and DM1-4000 compatibility: Both platforms share the same 11.1V three-cell battery rail, identical connector pinout, and compatible BMS handshake — which is why one cell covers all models in this group without firmware conflicts.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on a DM1-4000 unit. The BMS communicated correctly with the BIOS, charge current tapered normally at top-of-charge, and the protection circuit tripped cleanly at low-voltage cutoff with no hard shutdowns during mid-cycle load.
- First-cycle calibration on HP netbooks: After installing, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the Mini 210-3000 shuts down at 20–30% shown on the gauge
The fuel gauge IC estimates remaining capacity based on learned voltage curves from the previous cell. After a swap, those curves are stale. Under combined CPU and display load, the new cell's actual voltage drops faster than the old profile predicts — and when voltage hits the BMS cutoff threshold, the system shuts down before the gauge reaches zero. Running two full calibration cycles retrains the IC against the new cell's discharge curve. After calibration, shutdown should align with the gauge reading near 5% or hibernate-cutoff.
BIOS reporting battery health as "poor" or "unknown" after installing a new cell
The HP BIOS reads health status from EEPROM data stored in the battery's fuel gauge IC, not from live cell measurements. A replacement cell ships with factory EEPROM defaults that don't match the laptop's charge history, so the BIOS flags it as degraded or unknown on first boot. This is not a fault with the cell. Perform the full discharge-to-hibernate then uninterrupted charge-to-100% cycle — after one or two complete cycles, the BIOS learn cycle overwrites the stale EEPROM values and the health status corrects to normal.