About this replacement
Microsoft Surface Pro 4 (1724) — 7.5V Li-Polymer Replacement Battery (DYNR01 / G3HTA027H)
This is a 7.5V, 5050mAh (37.88Wh) Li-Polymer battery for the Microsoft Surface Pro 4, including model 1724. It replaces OEM parts DYNR01 and G3HTA027H. If your Surface Pro 4 no longer holds a charge, shuts down unexpectedly, or shows a degraded battery warning in Windows, this is the correct cell to swap in.
- Surface Pro 4 / 1724 fit confirmation: The 1724 board uses a specific connector tab orientation and a BMS handshake tied to the 7.5V cell voltage rail. Both DYNR01 and G3HTA027H are OEM designations for the same physical pack — same connector, same BMS signal, same form factor at 206.90 × 102.20 × 3.60mm.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Surface Pro 4 unit. The BMS negotiated correctly with the charge IC, no fault codes triggered, and Windows Battery Report confirmed the full design capacity was recognised.
- Fuel gauge recalibration after swap: After fitting this battery, let the tablet discharge fully to automatic shutoff, then charge uninterrupted to 100% without using the device. This one full cycle resets the fuel gauge IC against the new cell and clears the inaccurate percentage readings that typically appear in the first hours after a replacement.
Surface Pro 4 shutting down at 15–25% battery remaining
This happens because the fuel gauge IC is still calibrated to the old, degraded cell. The voltage curve of a worn cell drops off steeply at low charge, so the IC learned to call shutdown early. A new cell has a flatter discharge curve, but the IC doesn't know that yet. Run one full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% — after that single calibration pass, the reported percentage will track the actual cell voltage accurately.
Fast charging not available on Surface Pro 4 after battery replacement
The Surface Pro 4 charge IC needs at least one completed charge cycle on the new cell before it re-enables higher charge rates. On the first charge after a swap, the IC runs a conservative profile while it profiles the new cell's internal resistance. Plug in the OEM or a certified 65W Surface Connect charger and allow the first cycle to complete fully without interruption. After that cycle finishes, normal charge rates resume and the Surface Connect LED will behave as expected.