About this replacement
HP Mini 5101 — 10.8V Li-ion Replacement Battery (HSTNN-UB0G)
This is a 10.8V, 6600mAh (71.28Wh) Li-ion battery for the HP Mini 5101 netbook. It replaces OEM part numbers HSTNN-UB0G, HSTNN-UB0F, HSTNN-DB0G, and GC06, among others. If your original cell no longer holds a charge or the BIOS flags battery health as poor, this is the direct swap.
- Mini 5101 compatibility across variants: The FM956UT, FM955UT, FM978UT, and 24 additional Mini 5101 configurations all use the same battery bay geometry, connector pinout, and 10.8V rail — one cell fits every variant on the compatibility list.
- Bench tested on actual hardware: We ran this cell through charge and discharge on the Mini 5101 platform. The BMS communicated correctly with the EC, accepted a full charge without false cutoff, and reported capacity within normal variance on the fuel gauge IC.
- First-install calibration on the Mini 5101: After fitting, run the battery down to hibernate cutoff, then charge uninterrupted to 100%. This triggers the BIOS battery learn cycle, clears the inaccurate health warning that appears after every cell swap, and gives the fuel gauge IC a reference point against the new cell's actual chemistry.
BIOS reporting battery health as poor immediately after fitting a new cell
The HP Mini 5101 BIOS reads health data from EEPROM registers that the old cell wrote over hundreds of cycles. A brand-new cell arrives with different EEPROM state, so the BIOS flags it as degraded before a single cycle has run. This is not a fault with the replacement — it is a stale data mismatch. One full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the BIOS to rewrite those registers against the new cell. After two to three cycles, the health indicator normalises.
Netbook shutting down at 20–30% charge shown on the gauge
This happens when the fuel gauge IC has not yet calibrated against the new cell's voltage curve. The gauge displays a percentage based on the old cell's discharge profile, so it reads 25% while the actual cell voltage has already dropped below the EC's cutoff threshold. The fix is the same calibration cycle: discharge fully to hibernate, charge to 100% without interruption, and repeat once more. After two full cycles the gauge tracks the new cell accurately and the early shutdowns stop.