DeLorme inReach SE Replacement Battery 3.7V 2000mAh

DeLorme inReach SE / Explorer — 3.7V Li-Polymer Replacement Battery (MYT783968)

This 3.7V, 2000mAh Li-Polymer cell replaces the internal battery in the DeLorme inReach SE, inReach Explorer, INCRH20, and INRCH25 satellite communicators. These devices rely on continuous power to maintain two-way satellite messaging and GPS navigation in areas with no cellular coverage. A failed or degraded battery cuts off that link entirely.

• inReach SE and Explorer platform: These models share the same battery bay dimensions, connector pinout, and 3.7V power rail. The MYT783968 fits all four listed variants without modification.
• Bench tested on actual hardware: We cycled this cell through the inReach SE's power sequence and confirmed the BMS handshake completed correctly — the device reached full boot and acquired satellite signal without error flags.
• Cold-start satellite acquisition after swap: After fitting this cell, power the device on outdoors and allow it to complete a full satellite fix before heading out. Removing battery power triggers a cold start — first fix typically takes 5–10 minutes. Subsequent warm starts are under a minute once almanac data is cached.

GPS accuracy reduced at low battery on the inReach SE

The inReach SE's GPS receiver draws consistent power to maintain satellite lock and position accuracy. At low cell voltage — typically below 3.5V — some units reduce receiver sensitivity to protect remaining charge. This shows up as position drift or a wider accuracy radius on-screen, not a full loss of lock. Keeping the cell above 3.6V during active navigation prevents the receiver from stepping down.

inReach SE shuts off without warning before the battery indicator hits zero

After a full battery swap, the inReach SE's fuel gauge is uncalibrated to the new cell. The device tracks charge level using learned discharge curves from the old battery, so the voltage cutoff threshold can trigger before the on-screen indicator shows empty. This causes sudden shutdowns that look like a fault. Run one full charge-to-cutoff cycle after installation — the gauge recalibrates itself and the low-battery warning returns to the correct point.