Garmin GPSMAP 276 Compatible Battery 7.4V 3000mAh Li-ion

Garmin GPSMAP 276 / 276c / 296 / 376 Series — 7.4V Li-ion Replacement Battery (010-10517-00)

This is a 7.4V, 3000mAh Li-ion replacement battery for the Garmin GPSMAP 276, 276c, 296, and 376 series portable GPS navigators. It replaces OEM part numbers 010-10517-00, 011-00955-00, and 010-10517-01. The cell fits the original battery compartment and connects to the device's onboard BMS without modification.

• GPSMAP 276 / 276c / 296 / 376 compatibility: These models share a common battery form factor, voltage rail, and connector pinout across the series. The BMS on each unit checks cell voltage at startup — this replacement meets that handshake at 7.4V nominal with no firmware flag.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a GPSMAP 276c unit. The BMS accepted the cell cleanly, charge termination triggered correctly at full voltage, and no low-cell warnings appeared during discharge.
• Cold-start satellite acquisition after fitting: After installing this battery, power the unit on outdoors with clear sky view before your first trip. A full power interruption resets the satellite almanac, so expect a cold-start fix of 5–10 minutes on first use. Subsequent warm starts return to under a minute.

GPS accuracy dropping at low battery on the GPSMAP 276 series

When cell voltage drops below roughly 6.8V, the GPSMAP 276 series throttles receiver sensitivity to protect the BMS from a hard cutoff. This shows up as position drift or a wider accuracy circle on the moving map — not a hardware fault. The GPS receiver draws more current than the display, so sensitivity reduction is the unit's way of extending usable voltage headroom. Recharge the battery before voltage sags below that threshold to keep receiver performance stable.

GPSMAP 276 shutting off without a low-battery warning

After fitting a new cell, the GPSMAP 276's battery indicator needs a full discharge cycle to recalibrate its voltage-to-percentage mapping. Until that cycle completes, the indicator can read 20–30% while actual cell voltage is already near the BMS cutoff threshold — the unit then shuts off with no visible warning. Run one full charge-to-discharge cycle in the device to let the indicator recalibrate. After that cycle, the low-battery alert will trigger at the correct voltage before cutoff.