About this replacement
HP Pro x2 612 G1 — 7.4V Li-Polymer Replacement Battery (KK04XL)
This 7.4V Li-Polymer battery replaces the KK04XL and fits the HP Pro x2 612 G1 detachable tablet. Capacity is 3800mAh (28.12Wh), matching the original cell specification. It covers the full model range including the F1P93EA, K4K76UT, and L5G76EA variants, along with thirteen additional SKUs in the 612 G1 family.
- 612 G1 tablet compatibility: All Pro x2 612 G1 tablets share the same 7.4V battery rail, connector pinout, and BMS handshake protocol regardless of regional SKU suffix. One battery cell covers the full variant lineup.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the 612 G1 platform. The BMS handshake completed on first connection, and the charge IC accepted the full 3800mAh fill without fault codes.
- Fuel gauge recalibration after swap: After installing this battery, run one full discharge to automatic shutoff, then charge uninterrupted to 100%. This resets the fuel gauge IC against the new cell and clears the inaccurate percentage readings that commonly appear after a swap.
Why the Pro x2 612 G1 shuts down at 15–25% remaining
When the display backlight and WiFi radio draw current simultaneously, voltage drops faster than the fuel gauge IC expects. If the gauge is still calibrated to an old or degraded cell, it misreads remaining capacity and triggers an early low-voltage shutdown. The tablet cuts power at what appears to be 15–25% because the IC's discharge curve no longer matches the actual cell. One full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% realigns the curve and stops early shutdowns.
HP Pro x2 612 G1 showing wrong battery percentage after replacement
The fuel gauge IC inside the tablet was calibrated to the old cell's discharge curve. A new cell has a different internal resistance profile, so the IC reads voltage and reports an incorrect percentage. This is not a fault with the replacement battery. To fix it, discharge the tablet fully until it powers itself off, then plug it in and charge without interruption to 100% — the IC rewrites its calibration table against the new cell on that first complete cycle.