About this replacement
Movado Connect 2.0/40 — 3.8V Li-Polymer Replacement Battery (APP00302)
This 3.8V, 270mAh lithium-polymer cell replaces the original battery in the Movado Connect 2.0/40 smartwatch. It powers the display, processor, heart rate sensor, and Bluetooth radio. Dimensions are 28.60 × 23.50 × 3.70mm — confirm these against your existing cell before fitting.
- Connect 2.0/40 platform fit: The 40mm Connect 2.0 uses a fixed connector orientation and a slim 3.70mm profile dictated by the case depth. This cell matches that connector and profile exactly, keeping the BMS handshake intact so the watch reports charge state correctly.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the Connect 2.0/40 platform. The BMS accepted the new cell without fault codes, and the fuel gauge IC re-referenced correctly after a full charge from near-zero following swap.
- Post-swap charging protocol: After fitting, place the watch on its magnetic charger immediately and charge to 100% before wearing it. The fuel gauge IC on this platform cannot calibrate its capacity reference without one complete charge cycle from near-zero after a cell swap — skipping this step causes persistent 0% or erratic percentage readings.
Why the Connect 2.0/40 shows 0% immediately after a battery swap
The Connect 2.0/40 uses a fuel gauge IC that tracks charge state by monitoring coulombs in and out of a known reference cell. When you remove the old battery, that reference is lost entirely. The IC has no baseline for the new cell, so it defaults to or reports 0%. Placing the watch on charge immediately after reassembly and running a full charge to 100% gives the IC the reference point it needs. Do not skip this step — the percentage display will remain unreliable until that first full cycle completes.
New battery draining in one day instead of the expected multi-day span
On the Connect 2.0/40, always-on display mode combined with continuous heart rate monitoring can pull enough current to flatten a 270mAh cell within a single day — this is a load issue, not a cell defect. Check the watch settings and confirm whether always-on display and continuous HR are both active simultaneously. Switching HR monitoring to on-demand and disabling always-on display reduces the sustained current draw significantly. If drain remains extreme after those changes, check whether a background app is keeping the Bluetooth radio in constant active scan mode.