Garmin StreetPilot C320 Replacement Battery 3.7V 2600mAh

Garmin StreetPilot C320 / C340 / C530 — 3.7V Li-ion Replacement Battery (IA3AB07B1A97)

This 3.7V, 2600mAh Li-ion cell replaces the original battery in the Garmin StreetPilot C320, C330, C340, and C530 portable GPS navigators. It uses OEM part numbers IA3AB07B1A97, 361-00022-00, 361-00022-05, and 361-00022-07. Fit the correct cell and the unit charges, boots, and navigates exactly as it did when new.

• StreetPilot C-series compatibility: The C320, C330, C340, and C530 all share the same 3.7V single-cell architecture, connector pinout, and BMS handshake. One cell fits all four units without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the C-series platform. The BMS accepted charge without fault codes, held voltage within spec across the full state-of-charge range, and cut off cleanly at the low-voltage threshold.
• Cold-start satellite acquisition after swap: After fitting this cell, power the unit on outdoors and let it acquire a satellite fix before driving. A full power interruption triggers a cold start — first fix can take 5–10 minutes. Subsequent warm starts are under a minute once the almanac is cached.

GPS accuracy dropping at low battery on the StreetPilot C-series

As the C-series battery voltage drops below roughly 3.5V, the unit begins reducing power to the GPS receiver to extend remaining charge. This lowers receiver sensitivity, which narrows the satellite pool the unit can lock onto. Fewer satellites means a weaker position fix and wider error margins — enough to shift a plotted position by tens of metres in weak-signal conditions. Keeping the cell above its half-charge voltage keeps the receiver running at full sensitivity.

StreetPilot C320 shutting off without a low-battery warning

The C-series battery indicator reads from a voltage-to-capacity lookup table calibrated to the original cell. After years of cycling, the old cell's discharge curve shifts — the unit thinks it has charge remaining, then hits the hardware low-voltage cutoff without showing a warning. Fitting a fresh cell resets the actual discharge curve to match the lookup table. Run two full charge-to-cutoff cycles after fitting the new battery so the indicator and the real charge state align.