About this replacement
Garmin Nuvi 2660LMT Series — 3.7V Li-Polymer Replacement Battery (361-00051-00)
This 3.7V, 1200mAh Li-Polymer cell replaces the original battery in the Garmin Nuvi 2660LMT, 2669LMT, 2460LMT, and 2595LM portable GPS navigators. It matches OEM part numbers 361-00051-00, 361-00051-01, and 361-00051-12. Dimensions are 61.95 × 36.50 × 5.20mm — confirm against your existing cell before fitting.
- Nuvi 2460–2669 series compatibility: These models share the same battery bay geometry, connector pinout, and 3.7V charging rail. The BMS handshake is identical across the range, so one cell covers the full group without modification.
- Bench tested on actual hardware: We ran this cell through charge cycles on a Nuvi 2660LMT unit. The BMS accepted the cell immediately, reached full charge voltage without fault flags, and the device held its charge state correctly through standby and active navigation loads.
- First-use satellite acquisition: After fitting this cell, power the GPS fully on outdoors before your first drive. A full power interruption triggers a cold start — the receiver can take 5–10 minutes to acquire its first satellite fix. Subsequent warm starts return to under a minute once almanac data is cached.
Why active navigation drains the Nuvi 2660LMT faster than standby
The 2660LMT draws from two separate loads simultaneously during active navigation: the GPS receiver antenna circuit and the backlit LCD display. In standby, only the receiver ticks over at low duty. With the display at full brightness and real-time traffic processing active, current draw can run three to four times higher than in standby. Reducing screen brightness one or two steps is the single most effective way to extend a navigation session on one charge.
Nuvi 2660LMT shuts off without warning before the low-battery indicator appears
This happens when the device's fuel gauge is uncalibrated against a new cell. The shutdown voltage threshold fires before the on-screen warning has a chance to display because the gauge still expects the discharge curve of the old, degraded battery. Run two full charge-to-discharge cycles on the new cell to let the gauge recalibrate. After two cycles, the low-battery warning will appear at roughly 3.5V before the unit cuts out.