About this replacement
HP Chromebook 11 G5 / 11 G5 EE — 11.1V Li-Polymer Replacement Battery (918669-855)
This is an 11.1V, 4000mAh (44.4Wh) lithium-polymer replacement battery for the HP Chromebook 11 G5 and 11 G5 EE. It replaces OEM part numbers 918669-855, SQU-1603, and 918340-2C1. Fits both the standard and EE education variants of this Chromebook — same cell format, same BMS handshake.
- G5 and G5 EE compatibility: Both models run the same 11.1V battery rail and use an identical connector and BMS communication protocol. HP made no hardware revision to the battery bay between the standard and EE variants, so one cell covers both boards.
- Bench tested on actual hardware: We ran this cell through charge, discharge, and BMS handshake verification on G5 hardware. The BMS accepted the new cell without fault codes and reported capacity correctly after one full calibration cycle.
- Post-install calibration on the G5: After fitting this battery, run the Chromebook down to automatic hibernate cutoff — do not force shut it down mid-discharge. 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.
BIOS reporting poor battery health immediately after fitting a new cell
The HP Chromebook 11 G5 stores battery health data in EEPROM on the original cell. When a new cell goes in, the BIOS reads no matching cycle history and flags health as poor or unknown — this is not a fault with the replacement. The fuel gauge IC also loses its calibration reference and needs new data points. Running two to three full discharge-to-hibernate then full-charge cycles gives the BIOS enough data to recalculate health accurately. After that, the health warning clears on its own.
Chromebook 11 G5 shutting down at 20–30% battery shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge over-reports remaining charge, and the laptop hits the real low-voltage cutoff before the display hits 0%. It is not a fault with the cell itself. Force a full discharge to hibernate cutoff — do not plug in at 20% — then charge to 100% without interruption. After two of these full cycles, the gauge recalibrates and the cutoff aligns correctly with what the screen shows.