About this replacement
HP ZBook Studio G3/G4 Series — 15.4V Li-Polymer Replacement Battery (2N08XL)
This 15.4V, 5850mAh (90.09Wh) Li-Polymer cell replaces the original 2N08XL battery in the HP ZBook Studio G3 and G4 mobile workstations. It fits the V8N25PA, Y6K33EA, 1RR16EA, and related Studio G3/G4 variants. OEM part numbers covered include 907428-2C1, 907584-850, 907584-852, HSN-C02C, HSTNN-DB7U, and ZN08XL.
- ZBook Studio G3 and G4 platform fit: Both generations use the same 15.4V four-cell Li-Polymer pack, the same HSN-C02C connector footprint, and the same BMS handshake protocol — which is why a single replacement cell covers the entire Studio G3/G4 range without modification.
- Bench tested on actual hardware: We cycled this cell on a ZBook Studio G3 chassis and confirmed the BMS initialised correctly, the BIOS accepted the EEPROM data, and charge current tapered properly through CC/CV stages without fault codes.
- ZBook battery learn cycle after install: After fitting, discharge the laptop to hibernate cutoff under normal workstation load — GPU and CPU both active — then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning the firmware posts after every cell swap.
BIOS reporting poor battery health immediately after replacement
HP's ZBook firmware stores learned capacity data from the previous cell in its battery learn table. When a new cell is fitted, the BIOS compares the incoming EEPROM values against that stored table and flags a mismatch as degraded health. This is a firmware calibration state, not a battery fault. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% — the BIOS resets its learn cycle and the health warning clears within two to three cycles.
Laptop shutting down at 20–30% charge shown on new cell
This is a voltage cliff issue, not a capacity problem. Under full ZBook load — discrete GPU rendering, sustained CPU boost, and a high-brightness display — the cell voltage drops faster than the fuel gauge IC can recalibrate. The BIOS hits its minimum voltage threshold and forces a shutdown before the displayed percentage reaches zero. Run two to three full calibration cycles under moderate load so the fuel gauge IC maps the actual discharge curve of the new cell. After calibration, shutdown should not occur above 5% indicated charge.