About this replacement
Louis Vuitton Tambour Horizon 2 — 3.8V Li-Polymer Replacement Battery (APP00282)
This is a 3.8V, 300mAh lithium-polymer cell for the Louis Vuitton Tambour Horizon 2 smartwatch. It replaces OEM part APP00282 and restores power to the watch's timekeeping, notifications, fitness tracking, and connectivity functions. The cell measures 24.50 x 23.30 x 4.50mm and matches the original form factor.
- Tambour Horizon 2 fitment: The Horizon 2 uses a compact pouch-style cell on a 3.8V rail with a multi-pin connector that passes BMS data to the watch's fuel gauge IC. This replacement matches that connector pinout and cell geometry so the BMS handshake completes on first boot.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Horizon 2 platform. The BMS accepted the cell without fault codes, and the fuel gauge registered state-of-charge correctly after a full calibration cycle.
- Fuel gauge calibration after swap: Place the watch on its magnetic charger immediately after fitting this cell and charge to 100% before first use. The Horizon 2's fuel gauge IC loses its reference point when the cell is removed and cannot recalibrate without a full charge from near-zero — skipping this step causes persistent 0% or wildly inaccurate battery readings.
Why the Tambour Horizon 2 burns through a new cell in one day
The Horizon 2 runs Wear OS with an always-on display option and continuous heart rate monitoring. Together those two features can draw enough current to deplete a 300mAh cell well inside 24 hours. A new cell on a fresh impedance profile also appears to drain faster in the first few charge cycles while the fuel gauge recalibrates its internal model. If daily drain is still excessive after three full cycles, check that always-on display is off and that heart rate is set to periodic rather than continuous in the Wear OS settings.
Watch not pairing to phone after battery replacement
Removing the battery terminates any active Bluetooth Low Energy session and clears the watch's active connection state. The companion app on your phone holds the old session ID, which no longer matches the watch after a full power removal. Open the Louis Vuitton companion app or your phone's Bluetooth settings, forget the watch, then initiate a fresh pair from the watch's own Bluetooth menu. The watch must show its six-digit pairing code on screen — if it does not appear, restart the watch first by holding the crown for ten seconds.