About this replacement
Huawei Glory S1 (MES-B19) — 3.82V Li-Polymer Replacement Battery (HB361819ECW)
This is a 3.82V, 70mAh lithium-polymer cell that fits the Huawei Glory S1 smartwatch (model MES-B19). It replaces OEM part number HB361819ECW and restores power to the watch's display, heart rate sensor, and Bluetooth radio. At 18.05 x 18.00 x 3.40mm, the cell matches the original footprint exactly.
- Glory S1 and MES-B19 compatibility: Both model identifiers reference the same hardware revision. The connector pinout, BMS handshake voltage, and physical dimensions are identical across both — one cell covers both designations without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Glory S1 platform. The BMS accepted the cell without fault codes, and the fuel gauge IC locked onto the new cell's reference voltage after one full charge cycle.
- Post-swap charge requirement: After fitting this cell, place the watch on its magnetic charger immediately and bring it to 100% before use. The Glory S1's fuel gauge IC cannot calibrate accurately without a complete charge cycle from near-zero following a cell swap — skipping this step causes the gauge to misread capacity from the first day.
Why the Glory S1 shows 0% immediately after a battery swap
The Glory S1 uses a coulomb-counting fuel gauge IC that tracks charge relative to a stored reference baseline. When the cell is removed, that baseline resets to zero. The watch reads the new cell as fully depleted because it has no discharge history to reference. Placing the watch on charge immediately after reassembly allows the IC to run a full calibration cycle. Once it reaches 100% and you begin normal use, the percentage readings stabilise.
Battery draining in one day instead of the expected multi-day life
Continuous heart rate monitoring and always-on display together draw sustained current from a 70mAh cell — at this capacity, those two features alone account for the bulk of daily drain. If the watch is set to sample heart rate every second rather than every ten minutes, drain accelerates significantly. Check the HR monitoring interval in the Huawei Health app and switch from continuous to periodic sampling. Also confirm always-on display is disabled in the watch settings, as that alone can cut daily drain by roughly a third on the Glory S1.