Teltonika GH3000 Replacement Battery 3.7V 750mAh Li-ion

Teltonika GH3000 / GH4000 / MH2000 — 3.7V Li-ion Replacement Battery

This 3.7V, 750mAh (2.78Wh) Li-ion cell replaces the internal battery in the Teltonika GH3000, GH4000, and MH2000 rugged mobile devices. All three units run the same 3.7V single-cell architecture with matching physical dimensions of 53.00 × 33.90 × 5.70mm. Swap this cell when the original no longer holds a charge or the device shuts down unexpectedly under load.

• GH3000 / GH4000 / MH2000 compatibility: These three Teltonika models share the same battery bay dimensions, connector pinout, and 3.7V single-cell voltage rail. The BMS handshake is identical across the series, so one cell fits all three without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a GH3000 unit. The BMS accepted the cell on first insertion, charge termination triggered correctly at 4.2V, and protection cutoff fired as expected under short-circuit simulation.
• Fuel gauge recalibration on first cycle: After installing this cell, run one full discharge to automatic shutdown followed by a complete uninterrupted charge before enabling fast charging. The GH3000's fuel gauge IC maps its coulomb counter to the new cell's discharge curve during that first cycle — skipping it causes erratic percentage readings for days.

Why the GH3000 reports wrong battery percentage after a cell swap

The GH3000 uses a fuel gauge IC that stores a learned discharge curve from the old cell in non-volatile memory. When a new cell goes in, that stored curve no longer matches actual cell chemistry, so the reported percentage drifts away from true state of charge. The IC recalibrates by running a full reference cycle — discharge to BMS cutoff, then charge to 4.2V termination without interruption. Until that cycle completes, the gauge is interpolating against the wrong curve. Run one complete cycle and the percentage display locks back to within a few percent of actual.

Sudden shutdown at 20–30% remaining on the GH3000

This happens when the cell voltage collapses under the current spike from the modem radio or display backlight, even though the gauge still reads 20–30%. A cell with elevated internal impedance — either a worn original or a new cell with an uncalibrated gauge — cannot sustain voltage above the BMS cutoff threshold during that load spike, so the device drops out instantly. Check the voltage at shutdown by reading the device diagnostics immediately after restart — a reading below 3.4V under load confirms voltage sag, not a capacity issue. One full reference discharge-charge cycle reduces this by syncing the gauge to the actual knee of the discharge curve.