About this replacement
HP EliteBook 848 G4 — 11.55V Li-Polymer Replacement Battery (854047-1C1)
This 11.55V, 4100mAh (47.36Wh) lithium-polymer battery replaces the original pack in the HP EliteBook 848 G4 (1LH18PC) and a broad range of HP EliteBook 840 G4 and ZBook 14u/15u G4 notebooks. It matches the OEM connector, cell count, and BMS handshake required by HP's power management firmware. Cross-reference part numbers include 854047-271, TA03XL, HSTNN-IB7L, and HSTNN-LB7J.
- EliteBook 840/848 G4 and ZBook 14u/15u G4 platform fit: These models share a common three-cell Li-Polymer architecture, the same 7.00mm-profile battery bay, and an identical BMS communication line. One cell SKU covers the full G4 generation because HP standardised the voltage rail and SMBUS protocol across this chassis family.
- Bench tested on actual hardware: We cycled this cell through charge, discharge, and idle states on an EliteBook 840 G4 host. The BMS completed authentication without error, the fuel gauge IC registered full capacity, and HP Support Assistant reported the cell as healthy with no fault codes logged.
- Post-install calibration cycle: After fitting this cell, discharge the laptop normally until it hibernates at low battery, then charge uninterrupted to 100% without interruption. This single full cycle lets the BIOS battery-learn routine re-map the new cell's actual capacity curve and clears the inaccurate health warning that appears immediately after any cell swap.
BIOS reporting poor battery health immediately after replacement
HP's embedded controller reads cycle count, rated Wh, and state-of-health data stored in the cell's EEPROM when a new battery is first seated. Because those EEPROM values reflect a fresh cell with zero history, the controller sometimes flags a mismatch against the previous battery's learned profile and marks health as "poor" or "check battery." This is a firmware calibration state, not a defective cell. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100%. After that cycle, HP Support Assistant should show health status as normal and report the rated 47.36Wh.
Laptop shuts down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The gauge estimates remaining capacity from a model built on the old cell, so it loses accuracy near the bottom of the charge window and the laptop hits the BIOS low-voltage cutoff before the displayed percentage reaches zero. The fix is the same calibration cycle: let the machine discharge until Windows hibernates, then charge fully to 100% without interruption. After two or three full cycles the gauge re-maps the curve and the shutdown threshold tracks correctly down to approximately 3.5V per cell.