TwoNav Delta GPS Compatible Battery 3.7V 1000mAh 69019-00N

TwoNav Delta / Sportiva Series — 3.7V Li-ion Replacement Battery (69019-00N)

This is a 3.7V, 1000mAh Li-ion cell that replaces part number 69019-00N in the TwoNav Delta, Sportiva, and Sportiva2 handheld GPS navigators. These are compact outdoor navigation units used for hiking, trail mapping, and field navigation. Same voltage, same form factor — 52.96 × 33.64 × 5.15mm — and a direct fit to the original battery bay.

• Delta, Sportiva, and Sportiva2 compatibility: All three models draw from the same 3.7V battery platform and use the same connector pinout and bay dimensions. TwoNav standardised this cell across the Sportiva line and the Delta, so one replacement covers the full group without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a GPS-class load profile. The BMS held the low-voltage cutoff correctly and returned consistent capacity at the 1000mAh rating without tripping early under active navigation load.
• Cold-start satellite acquisition after fitting: After fitting this cell and powering on, take the device outdoors before launching navigation. A full power interruption triggers a GPS cold start — the first satellite fix after a battery swap takes 5–10 minutes in open sky. Subsequent warm starts drop back under a minute once the almanac is rebuilt.

GPS accuracy reduced at low battery on the Delta and Sportiva

When cell voltage drops toward the lower end of the 3.7V nominal range, some TwoNav units reduce GPS receiver sensitivity to protect remaining capacity. This shows up as position drift or reduced satellite count — not a hardware fault, but a power-management response. Running active navigation with high screen brightness accelerates the voltage drop that triggers this behaviour. Keeping the cell above half charge during active outdoor use holds the receiver at full sensitivity.

Device shuts off without warning before the battery indicator hits empty

A fresh replacement cell needs a full charge-discharge cycle before the on-screen fuel gauge reads accurately. Until that cycle completes, the Delta's voltage threshold for low-battery warning may not align with actual cell state. The device hits its cutoff voltage — typically around 3.0V under load — before the indicator shows critical. Run one full charge from flat to full, then discharge through normal navigation use, and the gauge recalibrates to the new cell.