About this replacement
HP ProBook 4210S / 4310S / 4311S — 14.8V Li-ion Replacement Battery (HSTNN-I69C)
This is a 14.8V, 2200mAh (32.56Wh) Li-ion replacement battery for the HP ProBook 4210S, 4310S, 4311, and 4311S laptops. It fits all four models using the same connector, voltage rail, and BMS handshake as the original HP cell. Cross-references include HSTNN-DB91, HSTNN-OB91, 530975-341, and AT902AA, among others listed above.
- ProBook 4210S / 4310S / 4311S platform fit: All four models share the same 14.8V battery bay, identical connector pinout, and the same BMS communication protocol — which is why HP used one battery family across this entire notebook line.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a ProBook 4310S. The BMS negotiated correctly, charge termination triggered at the expected voltage ceiling, and the OS fuel gauge reported state-of-charge without error after calibration cycles.
- BIOS learn cycle after install: After fitting this battery, run the laptop down to hibernate cutoff on battery power alone, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the ProBook 4210S reports poor battery health immediately after a new cell install
The HP ProBook BIOS stores battery health data in EEPROM and compares it against the previous cell's charge history on every boot. A brand-new cell presents a blank or mismatched EEPROM profile, which the BIOS reads as degraded. This is a data mismatch — not a fault with the replacement battery. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the BIOS to rewrite the learn cycle against the new cell's actual characteristics. After one to two full cycles, the health indicator corrects itself.
ProBook shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC on the motherboard is still calibrated to the old cell's discharge curve. Under combined CPU and display load, actual cell voltage drops faster than the fuel gauge predicts — the laptop hits the low-voltage cutoff while the OS still shows charge remaining. The fix is calibration: discharge fully to hibernate, then charge uninterrupted to 100% without interruption, repeating two to three times. After these cycles the fuel gauge tracks the new cell accurately and cutoff aligns with the displayed percentage.