Microsoft Surface 1769 Replacement Battery DYNK01 7.57V 5900mAh

Microsoft Surface 1769 / 1782 — 7.57V Li-Polymer Replacement Battery (DYNK01 / G3HTA036H)

This is a 7.57V, 5900mAh (44.66Wh) lithium-polymer replacement battery for the Microsoft Surface 1769 and Surface 1782 tablets, including the Surface 2-LQN-00004 variant. It replaces OEM part numbers DYNK01 and G3HTA036H. Swap it in when the original cell no longer holds a usable charge or the tablet shuts off unpredictably under load.

• Surface 1769 and 1782 platform fit: Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell covers the full range. The 287.90 × 112.60 × 3.00mm profile seats flat in either chassis without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a Surface 1769 unit. The BMS accepted the first charge without a protection-circuit trip, cell voltage held stable across the full state-of-charge window, and the charge IC completed the cycle cleanly at 8.40V.
• Post-swap fuel gauge reset: After installation, run the tablet down to automatic shutoff, then charge uninterrupted to 100%. The Surface fuel gauge IC calibrates against the old cell's learned capacity. One full discharge-to-shutoff cycle forces it to remap against the new cell and clears the inaccurate percentage readout that commonly appears after a swap.

Why the Surface 1769 shuts down at 15–25% remaining after a battery swap

The Surface fuel gauge IC stores a learned discharge curve from the original cell. A new cell has a different internal resistance profile, so the IC misreads the voltage slope and calls empty too early. Under combined display-plus-WiFi load, this mismatch is amplified — the reported state-of-charge drops faster than actual depletion, triggering a low-voltage shutdown before the cell is truly exhausted. One complete discharge-to-shutoff followed by an uninterrupted charge to 100% gives the IC enough data to remap the curve against the new cell. After that cycle, the shutoff threshold aligns with real cell voltage.

Fast charging unavailable on the Surface after battery replacement

The Surface charge controller uses a proprietary handshake with the Surface Connect charger to authorise higher charge rates. On a freshly installed cell, the BMS occasionally holds the charge IC in a conservative mode until one accepted full cycle is logged. If fast charge is missing after the swap, connect the original Microsoft Surface Connect charger — third-party USB-C adapters without the correct USB-PD profile will not trigger the higher rate regardless of new cell or old. Complete one full charge cycle with the Surface Connect charger; the controller then unlocks the elevated charge current on subsequent sessions.