About this replacement
HP EliteBook 835 G7 / ZBook Firefly 14 G7 — 11.55V Li-Polymer Replacement Battery (CC03053XL)
This is an 11.55V, 4300mAh (49.67Wh) Li-Polymer replacement battery for the HP EliteBook 835 G7 and ZBook Firefly 14 G7 series. It cross-references OEM part numbers CC03XL, HSTNN-DB9Q, HSTNN-IB9F, L77608-1C1, L78555-005, and related L-series codes. It fits the EliteBook 830 G7 and the full list of ZBook Firefly 14 G7 configurations that share this cell platform.
- EliteBook 835 / ZBook Firefly 14 G7 cell platform: These models share a common three-cell Li-Polymer rail at 11.55V nominal, the same BMS handshake protocol, and an identical physical connector pinout — which is why one cell SKU covers the full range without modification.
- Bench tested on actual hardware: We ran this cell on an EliteBook 835 G7 unit and confirmed full BIOS battery recognition, BMS communication without error flags, and charge cycling to 100% across three consecutive charge events with no cutoff anomalies.
- Post-install calibration on the 835 G7: After fitting this cell, run one full discharge to the BIOS hibernate cutoff, then charge uninterrupted to 100%. This resets the HP 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 fitting a new cell
The HP BIOS on this platform reads health data from EEPROM registers that the original cell populated over its lifetime. When a new cell arrives, those registers either don't match the expected values or show zero cycle history. The BIOS flags this as degraded health before the battery learn cycle runs. One full discharge-to-hibernate followed by an uninterrupted charge to 100% rewrites those registers and clears the warning. After two to three cycles, BIOS health reporting normalises.
Laptop shuts down at 20–30% charge shown on the battery indicator
This is a voltage cliff issue, not a fuel gauge fault. Under combined CPU and display load, cell voltage drops faster than the fuel gauge IC expects — the cell hits the BMS low-voltage cutoff threshold while the OS still reports 20–30% remaining. It happens most often on an uncalibrated replacement cell because the fuel gauge IC has no discharge curve data for the new chemistry. Run the full learn cycle described above, then confirm the cutoff voltage resets to the correct 9.0V floor that the HP EC expects before calling the cell faulty.