About this replacement
3GO GT7002 / Geotab 7 — 3.7V Li-Polymer Replacement Battery (PT406080)
This is a 3.7V, 2500mAh Li-Polymer battery for the 3GO GT7002 and Geotab 7 tablets. It replaces OEM part number PT406080. If your tablet no longer holds a charge or drops off unexpectedly, this cell restores normal operation.
- GT7002 and Geotab 7 compatibility: Both tablets share the same battery bay dimensions and connector pinout, drawing from a single 3.7V cell with the same BMS handshake. One part number covers both units without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a GT7002 unit. The BMS accepted the new cell on first connection, charge IC engaged without fault codes, and voltage held steady under combined Wi-Fi and display load.
- Fuel gauge recalibration after swap: After installing this battery, run one full discharge to automatic shutoff, then charge uninterrupted to 100%. This resets the fuel gauge IC against the new cell and corrects the inaccurate percentage readings that commonly appear right after a battery swap.
GT7002 shutting down at 15–25% battery remaining
The GT7002 pulls hardest when the display is at full brightness and Wi-Fi is actively scanning or streaming. At around 15–25% state of charge, cell voltage drops sharply under that combined load — the BMS hits its low-voltage cutoff before the OS gauge reads zero. The old cell makes this worse as internal resistance rises with age. A new cell with lower internal resistance holds voltage further into discharge, so the cutoff threshold is reached much later in the cycle.
Fast charging not available after fitting the new battery
Some GT7002 units lose fast-charge capability after a battery swap because the charge IC needs one completed charge cycle to re-negotiate the charging profile with the new cell. Plug in using the original charger and cable — third-party cables often limit negotiation. Let the tablet charge uninterrupted from below 10% to 100%. After that cycle completes, fast charging typically resumes at the expected input rate.