Qstarz BT-1000X GPS Compatible Battery 3.7V 1000mAh

Qstarz BT-1000X / BT-Q810 / BT-Q818X — 3.7V Li-ion Replacement Battery (HXE-W01)

This is a 3.7V, 1000mAh Li-ion cell built to the HXE-W01 specification. It fits the Qstarz BT-1000X, BT-Q810, and BT-Q818X GPS data loggers. At 52.96 × 33.64 × 5.15mm, it slots directly into the same battery bay as the original.

• BT-1000X, BT-Q810, and BT-Q818X compatibility: All three units share the same HXE-W01 footprint, connector pinout, and 3.7V charging circuit — the BMS handshake is identical across the range, so one cell covers all three.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a BT-1000X unit. The BMS accepted the charge curve without tripping, voltage hold across the discharge was consistent, and cutoff triggered cleanly at the low-voltage threshold.
• Cold-start satellite acquisition after fitting: After fitting this cell and powering on, take the unit outdoors and leave it running. The GPS performs a full cold start after any complete power interruption — first satellite fix typically takes 5–10 minutes. Subsequent warm starts drop to under a minute once ephemeris data is cached.

GPS accuracy reduced at low battery on the BT-1000X

As cell voltage drops toward the cutoff threshold, some GPS receiver circuits reduce RF sensitivity to lower current draw. On the BT-1000X, this shows up as wider position scatter or track points jumping several metres off the actual path. The fix is straightforward — charge the unit before any logging session where accuracy matters. If you see position error increase mid-track, check the battery indicator; it likely reflects a cell that has lost capacity and is hitting the low-voltage range sooner than expected.

BT-1000X shuts off without low-battery warning

The fuel gauge on these loggers reads cell voltage, not actual state of charge. A degraded original cell can show a mid-level indicator right up until voltage collapses and the unit cuts off. A fresh 1000mAh cell restores the full voltage curve the gauge was calibrated against. After fitting, run one full charge and discharge cycle — this lets the voltage-to-capacity mapping realign so the warning threshold triggers correctly before cutoff.