Polar V650 GPS Watch Compatible Battery 3.7V 1400mAh

Polar V650 — 3.7V Li-Polymer Replacement Battery (G484466P)

This is a 3.7V, 1400mAh Li-Polymer cell built to the G484466P specification for the Polar V650 GPS cycling computer. It replaces the original cell when capacity has dropped to the point where the V650 can no longer sustain a full ride. Voltage and physical dimensions match the factory spec: 55.80 × 41.60 × 5.00mm.

• V650 platform fit: The V650 uses a flat Li-Polymer pouch cell with a specific connector orientation tied to the unit's charge management circuit. Swapping to a cell of incorrect thickness or capacity will cause fit problems or trigger the BMS to refuse charging entirely.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a V650 unit. The BMS accepted the cell without fault flags, charge termination triggered correctly at 4.2V, and the low-voltage cutoff fired at the expected threshold without premature shutdown.
• Cold-start satellite acquisition after swap: After fitting this cell, power the V650 fully on outdoors before your first ride. GPS performs a cold start after any complete power interruption — budget 5 to 10 minutes for first satellite fix outdoors rather than the sub-minute warm start you had before the swap.

V650 GPS accuracy dropping at low battery

The V650 GPS receiver draws consistent current to maintain satellite lock, but at low cell voltage the unit can reduce receiver sensitivity to protect remaining charge. This shows up as position drift or wider track scatter on climbs and descents where signal is already weaker. A degraded original cell that sags to 3.4V or below under GPS load will trigger this behaviour even when the on-screen indicator still shows one bar. Fitting a fresh cell and keeping it above 3.6V under load restores full receiver sensitivity.

V650 shutting off without a low-battery warning

This happens when the fuel gauge calibration drifts after a battery swap — the V650 reads remaining capacity from voltage curve data stored from the old cell. A fresh cell with a slightly different discharge curve can cause the indicator to read 20% while the actual voltage is already near cutoff. The fix is a full calibration cycle: charge to 100%, ride until the unit shuts off under GPS load, then charge uninterrupted back to 100%. After one full cycle the voltage-to-capacity mapping recalibrates and the warning fires at the correct threshold.