CalAmp LMU-200 GPS Navigator Replacement Battery 3.7V 200mAh

CalAmp LMU-200 Series — 3.7V Li-Polymer Replacement Battery (1BF112-E601435)

This 3.7V, 200mAh lithium-polymer cell replaces the internal battery in the CalAmp LMU-200 GPS tracking unit. It also fits the LMU-300, LMU-800, and LMU-3000. The battery sustains GPS reception and cellular data transmission during vehicle tracking operations when the primary power source is interrupted.

• LMU series compatibility: The LMU-200, LMU-300, LMU-800, and LMU-3000 share the same compact Li-Polymer cell format, connector pinout, and 3.7V nominal voltage rail. The internal BMS handshake is consistent across these units, so one replacement cell covers the full range.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the LMU platform. The BMS accepted the cell without fault codes, held voltage within spec through the full discharge curve, and cut off cleanly at the low-voltage threshold.
• Cold-start satellite acquisition after swap: After fitting this cell, power the unit on outdoors and let it acquire a full satellite fix before deploying the vehicle. The LMU performs a cold start after any full power interruption — first fix takes 5–10 minutes. Subsequent warm starts are under a minute once GPS almanac data is rebuilt.

Why the LMU-200 stops transmitting position data after power loss

The LMU-200 stores its last known configuration and network registration state in battery-backed memory. When the internal cell drains completely, that state is lost. On restart, the unit re-registers with the cellular network from scratch before it begins transmitting GPS positions again. Depending on network congestion, this re-registration can take several minutes — this is a software handshake delay, not a hardware fault.

LMU-200 shuts off without warning before the battery indicator trips

After a cell ages, its actual discharge curve no longer matches the voltage thresholds the firmware was calibrated against. The unit reads sufficient voltage until a sudden load spike — typically a cellular transmission burst — pulls the cell below 3.0V and triggers a hard cutoff. The visual low-battery warning never fires because the voltage drop is too fast. Replacing the cell restores the flat mid-range discharge curve the firmware expects, and the warning threshold behaves correctly again.