GT102 GPS Tracker Replacement Battery 3.7V 750mAh Li-ion

GPS Tracker GT102 / TK102 — 3.7V Li-ion Replacement Battery

This 3.7V 750mAh (2.78Wh) Li-ion cell replaces the original battery in the GPS Tracker GT102 and TK102 portable tracking units. Both devices use the same compact battery format — 46.20 × 34.14 × 5.68mm — with a matching connector and BMS profile. When the original cell degrades, GPS signal transmission and data logging become intermittent or stop altogether.

• GT102 and TK102 compatibility: Both trackers share the same PCB layout, connector pinout, and voltage rail. One replacement cell covers either unit without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a GT102 unit and confirmed the BMS accepted charge handshake correctly, held cutoff at the expected low-voltage threshold, and logged no overcurrent faults during GPS burst transmissions.
• First cycle after swap: After fitting this cell, let the tracker run one full discharge-to-charge cycle before leaving it on continuous standby. The onboard fuel gauge IC calibrates its state-of-charge reading against the actual discharge curve — skipping this step causes the device to report inaccurate charge levels and may trigger early low-battery shutdowns.

Why the GT102 cuts out during active GPS transmission

GPS burst transmissions pull a short but sharp current spike from the cell. A degraded or deeply discharged cell cannot sustain voltage under that load, so the BMS trips the output to protect the cell. The result looks like a random shutdown rather than a flat battery. A fresh cell with sufficient internal resistance tolerance handles the spike without the BMS intervening. If the new cell still cuts out on the first few transmissions, complete one full charge cycle — the BMS stabilises once the cell is fully conditioned.

Tracker not powering on after sitting in storage

Li-ion cells stored below roughly 2.5V trigger a BMS lockout — the protection circuit opens and blocks all output to prevent further cell damage. Plugging the tracker into USB may show no response and no charging indicator. Connect it to a stable 5V USB source and leave it untouched for 20–30 minutes — most BMS circuits on these cells include a trickle pre-charge path that slowly recovers the cell voltage before re-enabling full charge current. If the cell recovers, charge it fully before use and confirm the fuel gauge reads correctly at 4.2V.