About this replacement
HP Mini 311 Series — 10.8V Li-ion Replacement Battery (HSTNN-UB0N)
This is a 10.8V, 6600mAh Li-ion battery for the HP Mini 311 netbook. It replaces OEM part numbers HSTNN-UB0N, HSTNN-OB0N, HSTNN-IB0N, HSTNN-Q44C, HSTNN-Q45C, 572831-541, 580029-001, and related variants. It fits the Mini 311 base model and confirmed variants including the 311-1007TU, 311-1008TU, and 311-1012TU.
- Mini 311 platform fit: All Mini 311 variants run the same 10.8V three-cell battery rail with an identical connector and BMS handshake protocol. The HSTNN-UB0N family covers the full production run because HP used one battery specification across all regional SKUs in this series.
- Bench tested on actual hardware: We ran this cell on a Mini 311 unit and monitored BMS communication through a full charge and load cycle. The BMS authenticated without error codes, charge current tapered correctly at the top of the curve, and the cell held voltage under sustained CPU and display load.
- Post-install calibration on the Mini 311: After fitting this battery, run one full discharge to the hibernate cutoff, then charge uninterrupted to 100% without unplugging. This forces the BIOS to complete a battery learn cycle against the new cell and clears the inaccurate health warning that otherwise appears after every cell swap on this platform.
Why the Mini 311 BIOS flags a new battery as poor health
The HP Mini 311 stores battery health data in the EEPROM of the original cell. When you swap to a new cell, the BIOS reads zero charge history and flags the battery as degraded or unknown — even though the new cell is at full capacity. This is a data mismatch, not a fault. Running two to three full discharge-and-charge cycles gives the fuel gauge IC enough data to recalibrate against the new cell's actual voltage curve and clear the warning.
Mini 311 shutting down at 20–30% charge shown on screen
This happens when the cell voltage drops below the BMS cutoff threshold before the fuel gauge shows empty — a voltage cliff under combined CPU and display load. The OS fuel gauge is interpolating from the old cell's discharge curve, so the percentage reading is wrong at the bottom end. It is not a fault with the new cell; it is the fuel gauge IC still running stale calibration data. After two full discharge-to-cutoff cycles, the gauge reanchors to the new cell and the shutdowns stop.