About this replacement
Huawei GT2 Pro / Watch 3 — 3.87V Li-Polymer Replacement Battery (HB532729EFW)
This 3.87V, 450mAh Li-Polymer cell replaces the HB532729EFW battery in the Huawei Watch GT2 Pro, Watch 3, and GLL-AL04. It restores full smartwatch function — fitness tracking, heart rate monitoring, sleep tracking, and notifications. Dimensions are 26.50 × 25.50 × 5.00mm, matching the original cell footprint.
- GT2 Pro, Watch 3, and GLL-AL04 compatibility: All three models share the same battery bay dimensions, connector pinout, and BMS handshake protocol, which is why one cell covers the full group.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge passes on a GT2 Pro unit. The BMS accepted the cell without fault flags, and the fuel gauge IC re-registered state-of-charge correctly after a full charge cycle post-swap.
- Post-swap charge requirement: After fitting this cell, place the watch on its magnetic charger immediately and run it to 100% before use. The fuel gauge IC on the GT2 Pro loses its charge reference when the original cell is removed. Without a full charge from near-zero, the gauge will misread capacity and report inaccurate percentages throughout the day.
Why always-on display and continuous HR monitoring drain the GT2 Pro battery faster than expected
The GT2 Pro's always-on AMOLED display draws current continuously, unlike a standard notification screen that wakes on wrist raise only. Layered on top, continuous heart rate monitoring polls the optical sensor roughly every second, adding a persistent background load. Together, these two features can account for the majority of daily draw on a 450mAh cell. Switching always-on display off and setting HR monitoring to 10-minute intervals significantly reduces that load.
Charge contacts not connecting on the magnetic charger after reassembly
If the watch does not register on the charger after battery replacement, the back cover has likely shifted fractionally during reassembly, misaligning the internal charge contacts with the magnetic pogo pins. Remove the watch from the charger, press firmly and evenly around the back cover edge to re-seat it, then place it back on the charger. A successful connection shows a charging icon within five seconds. If it still fails, check that the back cover is fully flush with no raised edges before attempting again.