Garmin fēnix 5S Replacement Battery 3.7V 1800mAh 010-12110-003

Garmin Zumo 590 / 590LM / 595 — 3.7V Li-ion Replacement Battery (010-12110-003)

This 3.7V, 1800mAh Li-ion cell replaces the original battery in the Garmin Zumo 590, Zumo 590LM, and Zumo 595 motorcycle GPS navigators, as well as devices listed under OEM references 361-00077-00, 361-00077-10, 616-00077-00, and 616-00077-10. It matches the original form factor at 52.00 × 35.50 × 11.20mm, fitting the battery bay without modification. Voltage and capacity are identical to factory spec.

• Zumo 590 / 590LM / 595 platform fit: These three units share the same battery bay geometry, connector pinout, and BMS communication protocol. The Zumo line uses a single-cell Li-ion pack with integrated thermistor — this cell carries the matching thermistor so the device's charge controller reads temperature correctly and won't abort mid-charge.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Zumo 590. The BMS accepted the cell without fault flags, charge termination triggered correctly at full capacity, and the low-voltage cutoff fired at the expected threshold — no premature shutdowns during discharge.
• Cold-start GPS initialisation after fitting: After fitting this cell, power the Zumo fully on outdoors before mounting it on the bike. The GPS module performs a cold start after any full power interruption — expect 5–10 minutes for the first satellite fix. Subsequent warm starts drop to under a minute once almanac data is cached.

Why the Zumo 590 shuts off without warning before the battery indicator hits zero

The Zumo 590's fuel gauge is a voltage-based estimator calibrated to the original cell's discharge curve. A new or aged cell with a slightly different curve means the device reads remaining capacity inaccurately. When the actual cell voltage drops below the hardware cutoff threshold, the unit powers off — even if the on-screen indicator showed 20% remaining. To recalibrate, run two full discharge-to-shutoff cycles followed by complete charges. After those cycles, the estimator tracks the new cell's curve and warning behaviour returns to normal.

Saved routes and waypoints missing after battery replacement

The Zumo 590 stores maps and most route data on internal flash, which is non-volatile and survives a full power removal. However, active trip logs, current route state, and some user waypoints held in battery-backed SRAM are lost the moment voltage drops to zero during a swap. Before removing the old battery, sync the device to Garmin Express or export waypoints via the unit's built-in export function. After fitting this cell and powering on, re-import the exported file — waypoints restore fully and the device resumes normal operation.