About this replacement
HP Envy 17-CH Series — 15.12V Li-Polymer Replacement Battery (HSTNN-IB9T)
This is a Li-Polymer replacement battery for the HP Envy 17-CH laptop series, including the Envy 17-CH0005UA and over 200 compatible models. It runs at 15.12V with a 3650mAh (55.19Wh) capacity. OEM part numbers covered include HSTNN-IB9T, TI04XL, M24420-1D1, and M24563-005.
- Envy 17-CH series compatibility: Every model in the 17-CH lineup shares the same 15.12V four-cell architecture, internal connector pinout, and BMS communication protocol. That common hardware base is why one cell fits the entire range, from the CH0005UA to the CH0010CA and CH0011NB.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on a CH-series board. The BMS handshake completed without error codes, charge current tapered correctly at the top-of-charge threshold, and the protection circuit tripped cleanly at the low-voltage cutoff.
- First-cycle calibration on the 17-CH: After fitting this cell, run the laptop unplugged until it hibernates on its own, then charge uninterrupted to 100% without using the machine. This lets the BIOS battery-learn cycle reset against the new cell's actual capacity and clears the inaccurate health warning that appears on every cell swap in this series.
BIOS reporting poor battery health immediately after fitting a new cell
The HP Envy 17-CH stores battery state data in the BIOS. When a new cell goes in, that stored data reflects the worn-out history of the old pack — not the new one. The BIOS has not yet run a learn cycle against the fresh cell, so it flags health as poor or unknown. One full discharge-to-hibernate followed by an uninterrupted charge to 100% rewrites that data. After two to three cycles, the health indicator will update to reflect the actual condition of the new cell.
Laptop shuts down at 20–30% battery remaining shown on screen
This is a voltage-cliff problem, not a fuel gauge error. Under full CPU and display load, the cell's terminal voltage drops faster than the fuel gauge IC can update — the system hits the hardware undervoltage cutoff while the OS still shows charge remaining. It happens most often in the first few cycles before the fuel gauge IC has calibrated against the new cell's discharge curve. Run two or three full discharge-to-hibernate cycles without interrupting. After that, the IC's internal model aligns with the actual cell, and the shutdowns stop.