About this replacement
HP Mini 311 Series — 10.8V Li-ion Replacement Battery (HSTNN-UB0N)
This is a 10.8V, 4400mAh (47.52Wh) Li-ion battery for the HP Mini 311 netbook. It replaces OEM part numbers HSTNN-UB0N, HSTNN-OB0N, HSTNN-IBON, 572831-541, 580029-001, and several others in this family. It fits the Mini 311, Mini 311-1007TU, Mini 311-1008TU, Mini 311-1012TU, and over 50 additional Mini 311 variants.
- Mini 311 platform compatibility: Every model in this list shares the same 10.8V three-cell voltage rail, the same physical connector pinout, and the same BMS handshake protocol — which is why a single part number covers more than 50 sub-models without modification.
- Bench tested on actual hardware: We ran this cell on a Mini 311 chassis and confirmed the BMS completed the charge cycle without tripping an over-voltage cutoff, and the fuel gauge IC registered the full 4400mAh capacity across discharge.
- First-cycle calibration on the Mini 311: After installation, run the laptop on battery until it hibernates on low-power cutoff, then charge uninterrupted to 100%. This single learn cycle resets the BIOS battery health counter and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the Mini 311 BIOS reports poor battery health immediately after a new cell is installed
The HP Mini 311 BIOS reads health data from an EEPROM log built up by the original cell over its lifetime. When a fresh cell is installed, the BIOS compares it against that old log and flags a mismatch as poor health — even though the new cell is fine. The fuel gauge IC on this platform also needs several discharge-charge cycles before its internal model of the new cell stabilises. Until that calibration happens, health percentage readings can appear deflated or jump erratically. Run two full discharge-to-hibernate and uninterrupted-charge cycles to clear this.
Mini 311 shutting down abruptly at 20–30% charge shown on screen
This happens when the cell voltage collapses faster than the fuel gauge IC predicts under combined CPU and display load. The gauge was calibrated to a degraded old cell, so its discharge curve model no longer matches the new chemistry. The BMS triggers a hard cutoff to protect the cell before the screen percentage reaches zero. Fix this by completing one full discharge to hibernate-cutoff followed by an uninterrupted charge to 100%, then repeat once — after two cycles the fuel gauge recalibrates to the new cell's actual voltage curve.