Garmin eTrex GPS-GAR3200 Replacement Battery 3.7V 1000mAh

BTI GPS-GAR3200 — 3.7V Li-ion Replacement Battery (PW029123)

This BTI battery is a 3.7V, 1000mAh Li-ion cell that fits the Garmin eTrex GPS-GAR3200 series handheld GPS navigator. It replaces the original internal cell when capacity has dropped to the point where the unit shuts off mid-session. Dimensions are 50.30 × 36.17 × 5.60 mm — confirm your original cell matches before fitting.

• GPS-GAR3200 series fit: These Garmin eTrex units share the same single-cell 3.7V architecture and connector pinout. The BMS on this cell communicates charge status to the device without triggering false low-battery warnings at full charge.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the GPS-GAR3200 platform. The BMS held the cutoff threshold correctly and the device reported charge level accurately through the full cycle.
• Cold-start satellite acquisition after swap: After fitting this cell, power the GPS on outdoors and let it acquire a satellite fix before relying on it. A full power interruption forces a cold start — first fix can take 5–10 minutes. Subsequent warm starts drop to under a minute once almanac data is cached.

GPS-GAR3200 shutting off without low-battery warning

This happens when the device's voltage-threshold indicator is uncalibrated against the new cell. The GPS reads the battery indicator as showing charge remaining, but the actual cell voltage hits the BMS cutoff and the unit drops power. The fix is to run two or three full charge and discharge cycles after fitting the new cell. This lets the device recalibrate its voltage curve so the on-screen indicator matches the real charge state.

Saved routes and POIs missing after battery replacement

Some Garmin eTrex models store route and POI data in battery-backed RAM. A complete power interruption — which happens any time the cell is removed — can wipe that volatile memory. Waypoints saved to internal flash or an SD card survive the swap; only RAM-resident data is at risk. Before removing the old cell, export your routes via Garmin BaseCamp or save them to the device's SD card to avoid losing them.