Garmin Zumo 400 Replacement Battery 3.7V 3400mAh Li-ion

Garmin Zumo 400 / 500 Series — 3.7V Li-ion Replacement Battery (010-10863-00)

This 3.7V 3400mAh Li-ion cell replaces the original battery in the Garmin Zumo 400, 450, 500, and 500 Deluxe motorcycle GPS navigators. It matches OEM part numbers 010-10863-00, 011-01451-00, and 011-01451-03. Capacity is drawn from product data at 12.58Wh — not estimated.

• Zumo 400 / 450 / 500 series compatibility: These models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol — one cell fits the full range. The protection circuit communicates state-of-charge to the Zumo firmware the same way across all variants.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Zumo 500 unit. The BMS negotiated correctly with the device, hit the full 3.7V nominal rail without tripping the over-voltage cutoff, and reported charge percentage accurately in the status bar.
• Cold-start satellite acquisition after fitting: After any full power interruption, the Zumo performs a GPS cold start. Power the unit on outdoors with a clear sky view and leave it stationary — first satellite fix typically takes 5–10 minutes. Subsequent warm starts drop under a minute once almanac data is cached.

GPS accuracy reduced at low battery on the Zumo series

When cell voltage drops below roughly 3.5V, some Zumo units reduce GPS receiver sensitivity to extend operating time. The result is fewer tracked satellites and a wider position error — the blue dot drifts or locks onto a parallel street. A degraded original battery spends a large portion of each ride in this low-voltage window. A new cell at full capacity keeps the receiver running at full sensitivity for the bulk of the charge cycle.

Zumo shuts off without warning before the battery indicator hits empty

This happens when the device's fuel gauge is calibrated to the original cell's discharge curve and the replacement cell has a slightly different curve shape. The indicator still shows one or two bars, but the actual cell voltage has already crossed the unit's hardware cutoff threshold. To recalibrate, run the Zumo down to automatic shutdown from a full charge at least twice — the firmware rewrites its low-voltage threshold mapping after two full cycles and the indicator will align with actual remaining capacity.