About this replacement
Apple iPad Pro 10.5" — 3.77V Li-Polymer Replacement Battery (A1798)
This is a 3.77V, 8130mAh (30.65Wh) Li-Polymer replacement battery for the Apple iPad Pro 10.5" (2017). It fits models A1709 and A1852, including MQDT2LL/A and 26 additional regional variants. Swap it in when the original A1798 cell can no longer hold a charge or causes unexpected shutdowns.
- iPad Pro 10.5" model variants: Apple released the 10.5" Pro across Wi-Fi and cellular SKUs sharing the same voltage rail, connector, and BMS handshake — all drawing from the same A1798 cell. One replacement battery covers the full 2017 lineup.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a 10.5" Pro unit. The BMS communicated correctly with iPadOS at each state-of-charge threshold, and the charge IC accepted the full 8130mAh without fault flags.
- Fuel gauge recalibration after installation: After fitting this battery, run the iPad down to automatic shutoff, then charge uninterrupted to 100% without using the device. This gives the fuel gauge IC a clean reference point against the new cell and corrects the percentage drift that commonly appears after a swap.
iPad Pro 10.5" shutting down at 15–25% remaining
This happens when the display backlight and Wi-Fi radio draw simultaneously, causing a voltage sag that the fuel gauge reads as a cutoff threshold even though reported percentage is still above zero. The original cell develops this cliff as it ages — its internal resistance rises, and the voltage drop under combined load becomes steep enough to trigger a shutdown. A fresh cell with lower internal resistance eliminates the sag. After installation, one full discharge-to-shutoff cycle lets the BMS map the new cell's actual discharge curve.
iPad showing wrong battery percentage after battery replacement
The fuel gauge IC inside the iPad was calibrated against the old cell's charge curve. When a new cell goes in, the IC is still using stale reference data, so it reports inaccurate percentages — often jumping or plateauing at specific points. This is not a fault with the replacement cell. Run one complete cycle: discharge to automatic shutoff, then charge uninterrupted to 100%. After that cycle, the IC recalibrates and percentage reporting stabilises.