Garmin StreetPilot C320 Replacement Battery 3.7V 3000mAh

Garmin StreetPilot C320 Series — 3.7V Li-ion Replacement Battery (IA3AB07B1A97)

This is a 3.7V 3000mAh Li-ion cell for the Garmin StreetPilot C320, C330, C340, and C530 portable GPS navigators. It replaces the original internal battery when capacity fades or the device no longer holds a charge. OEM part numbers covered include IA3AB07B1A97, 361-00022-00, 361-00022-05, and 361-00022-07.

• StreetPilot C-series compatibility: The C320, C330, C340, and C530 share the same battery bay dimensions and 3.7V single-cell architecture. The connector pinout and BMS communication protocol are identical across these models, so one cell fits all four without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on StreetPilot hardware. The BMS accepted the cell without fault codes, held charge correctly at 4.2V peak, and cut off cleanly at the low-voltage threshold without triggering a hard shutdown error.
• Cold-start satellite acquisition after swap: After fitting this cell, power the unit on outdoors and allow it to acquire a full satellite fix before driving. A complete power interruption clears the GPS receiver's warm-start cache, so first fix after a battery swap can take 5–10 minutes. Subsequent power cycles will lock much faster.

GPS accuracy dropping at low battery on the StreetPilot C320

When battery voltage drops below roughly 3.5V, some StreetPilot units reduce GPS receiver sensitivity to cut power draw and extend remaining charge. This shows up as position drift, slower route recalculation, or the blue position arrow jumping erratically on the map. It is not a software bug or antenna fault — it is the receiver pulling back power to its RF front end. Keeping the battery above 3.6V during active navigation avoids this entirely, which is why a full-capacity cell matters more than it might appear for a device this old.

StreetPilot shutting off without a low-battery warning

The C320 displays a low-battery icon based on a voltage threshold calibrated to the original cell's discharge curve. An aged or partially degraded replacement may sag under the GPS and display load faster than the device expects, causing the voltage to hit the cutoff point before the warning has time to appear on screen. The fix is to recalibrate the indicator — run the battery from a full charge down to automatic shutdown once, then charge it fully without interruption. After that cycle, the device maps the actual discharge curve of the new cell and the warning reappears at the correct point, typically around 3.55V.