About this replacement
Garmin Nuvi 3700 Series — 3.7V Li-Polymer Replacement Battery (361-00064-02)
This 3.7V 1200mAh Li-Polymer cell replaces the original battery in the Garmin Nuvi 3700, 3760, 3760T, and 3790 portable GPS navigators. It matches the OEM part number 361-00064-02 and fits the same physical footprint at 60.00 x 36.47 x 5.20mm. Voltage and capacity match factory spec — no modification needed.
- Nuvi 3700 series compatibility: These models share the same battery bay dimensions, connector pinout, and 3.7V power rail. The Nuvi 3760T adds TMC traffic hardware but draws from the same cell — no variant-specific battery exists across this series.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the Nuvi 3700 platform. The onboard BMS accepted the cell without fault flags, held charge correctly, and the device reported battery status as expected throughout the test cycle.
- Cold-start satellite acquisition after fitting: After a full power interruption from a battery swap, the Nuvi performs a GPS cold start. Power the device on outdoors immediately after fitting and let it run until it acquires a satellite fix — this first lock can take 5–10 minutes. Subsequent warm starts return to under a minute.
GPS accuracy reduced at low battery on the Nuvi 3700
As the Nuvi 3700's battery voltage drops toward its lower threshold, the GPS receiver can reduce signal sensitivity to conserve power. This shows up as position drift or slower map updates during active navigation — not a software bug. A fresh, fully charged cell restores the receiver to full sensitivity. If accuracy issues appear only when the battery indicator is low, the cell is the cause.
Nuvi 3700 shutting off without warning before the battery indicator hits empty
After a battery swap, the Nuvi's fuel gauge is uncalibrated — it reads from a charge model built on the previous cell's behaviour. The device can hit its hardware voltage cutoff before the on-screen indicator reaches one bar. Run two or three full charge-and-use cycles to let the device recalibrate its voltage-to-percentage mapping. Unexpected shutoffs that stop after a few cycles confirm this is the cause.