About this replacement
Microsoft Surface Pro 6 1807 — 7.57V Li-Polymer Replacement Battery (DYNM02 / G3HTA038H)
This 7.57V, 5900mAh (44.66Wh) lithium-polymer battery replaces the original DYNM02 / G3HTA038H cell in the Microsoft Surface Pro 6 (Model 1807) and Surface Pro 5 (Model 1796). It restores portable operation to the detachable 2-in-1 tablet after the original cell degrades or fails. Voltage, connector pinout, and BMS communication profile match the OEM specification.
- Surface Pro 5 and Pro 6 compatibility: Both the 1796 and 1807 chassis use the same DYNM02 battery format — identical voltage rail, physical dimensions (228.50 × 120.00 × 4.30mm), and flex connector. The fuel gauge IC communicates over the same SMBus protocol in both generations, so one cell covers both.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Surface Pro 6 unit. The BMS accepted charge handshake without flagging an incompatible cell error, and the Windows battery report returned correct chemistry and rated capacity values.
- Fuel gauge recalibration after swap: After installation, run one full discharge to automatic shutoff, then charge uninterrupted to 100% without using the device. This gives the fuel gauge IC a complete voltage-curve reference against the new cell and corrects the percentage drift that commonly appears after a battery swap.
Surface Pro 6 shutting down at 15–25% battery remaining
This happens when the fuel gauge IC's stored discharge curve no longer matches the actual voltage cliff of the installed cell. The display backlight combined with active Wi-Fi draws enough current to cause a rapid voltage drop below the BMS cutoff threshold — even when the reported percentage still looks safe. The tablet interprets this as a critical low-voltage event and shuts down to protect the cell. One full calibration cycle — full discharge to shutoff, then uninterrupted charge to 100% — re-anchors the curve and pushes the reported shutoff point back below 10%.
Windows reporting incorrect battery percentage after replacement
The Surface Pro's fuel gauge IC calibrates its state-of-charge model against the original cell's charge and discharge profile. Swapping in a new cell leaves the stored model misaligned, so Windows displays a percentage that doesn't reflect actual remaining capacity. This shows up as sudden jumps — for example, dropping from 40% to 8% without warning, or sticking at 100% well into discharge. Fix it by running one complete discharge cycle to automatic shutoff, then charging uninterrupted to 100%. After that cycle, the IC rebuilds its reference curve against the new cell and percentage reporting stabilises.