About this replacement
Amazfit Stratos / GTS 2E — 3.85V Li-Polymer Replacement Battery (PL471822GH)
This 3.85V, 220mAh Li-Polymer cell replaces the OEM battery in the Amazfit Stratos (A1969) and GTS 2E smartwatches. It restores power to GPS navigation, heart rate monitoring, fitness tracking, and notification functions. Dimensions are 23.40 × 17.60 × 4.60mm — measure your existing cell before fitting if you are unsure.
- Stratos and GTS 2E compatibility: Both models use the same connector pinout and BMS handshake voltage threshold. The PL471822GH cell meets the 3.85V nominal rail both platforms require for firmware-level battery reporting to function correctly.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Stratos unit. The BMS accepted the cell without error flags, and the fuel gauge IC registered charge progression normally across the full voltage range from 3.0V cutoff to 4.35V peak.
- First charge after cell swap: Place the watch on its magnetic charger immediately after reassembly and charge to 100% before first use. The fuel gauge IC on this platform cannot calibrate correctly without a complete charge cycle from near-zero after a cell replacement — skipping this step causes inaccurate percentage readings.
Why the Stratos battery percentage jumps or freezes after a cell swap
The Stratos uses a coulomb-counting fuel gauge IC that tracks charge by measuring current flow over time. When you remove the old cell, that IC loses its reference point entirely. It does not auto-detect the new cell's state of charge — it guesses. Until you run a full charge cycle from near-depleted to 100%, the percentage display will jump, freeze, or read incorrectly. One complete charge cycle resets the reference and the gauge tracks normally from that point forward.
Watch not pairing to the Amazfit app after battery replacement
Removing the battery kills the BLE session entirely — the phone and watch no longer recognise each other as paired devices. This is not a fault with the new cell. Open the Amazfit app, go to your device settings, and remove the watch from the paired list. On the watch, navigate to Settings → Device Info and reset the connection. Re-pair from scratch and the app reconnects at the next sync attempt.