About this replacement
HP Pavilion 13-AN0006TU 5GR09PA — 7.6V Li-Polymer Replacement Battery (MM02XL)
This is a 7.6V, 4750mAh (36.1Wh) Li-Polymer replacement battery for the HP Pavilion 13 AN-series ultrabook. It fits the Pavilion 13-AN0006TU 5GR09PA and over 120 other AN-series variants including the AN0004TU, AN0035TU, and AN0014NF. OEM cross-references include MM02XL, HSTNN-DB8U, HSTNN-IB8Q, L27868-1C1, L27868-2D1, L28076-005, and MM02037XL.
- AN-series compatibility: The entire Pavilion 13 AN-series shares a common 7.6V battery rail, a single ZIF connector pinout, and the same BMS handshake protocol — which is why one cell covers 125-plus models across the range.
- Bench tested on actual hardware: We ran this cell in an AN-series unit and cycled it through full charge and discharge. The BMS negotiated correctly, the fuel gauge IC locked onto the new cell without fault codes, and charge acceptance held steady across three consecutive cycles.
- Post-install calibration for the AN-series: After fitting, let the laptop discharge fully until it hibernates, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting poor battery health immediately after swap on the Pavilion 13
The HP Pavilion 13's BIOS reads health status from EEPROM data embedded in the battery controller — data that was written for the old, degraded cell. When a new cell goes in, that stale EEPROM state still shows the previous battery's wear level. The BIOS interprets this as the replacement cell already being in poor condition. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the BIOS to execute its battery learn cycle, overwriting the old EEPROM health data with fresh readings from the new cell.
Pavilion 13 shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The IC still maps the old cell's discharge profile, so it reads 20–30% remaining at a point where the new cell's voltage is already near its cutoff floor under combined CPU and display load. The laptop interprets that voltage drop as a critical shutdown event. Run two full discharge-to-hibernate and full-recharge cycles — after that, the gauge recalibrates and the remaining percentage reading stabilises. Target a resting voltage of around 8.4V at full charge to confirm the cell is healthy.