Ihren ETI-L 11 GPS Replacement Battery 3.7V 1000mAh

Ihren ETI-L 11 0053557 / ETI-L11 — 3.7V Li-ion Replacement Battery (HXE-W01)

This 3.7V, 1000mAh Li-ion cell replaces the HXE-W01 battery in the Ihren ETI-L 11 0053557 and ETI-L11 portable GPS navigators. It matches the original voltage rail and physical footprint at 52.96 × 33.64 × 5.15mm. Capacity is rated at 3.7Wh — identical to the factory spec.

• ETI-L 11 and ETI-L11 compatibility: Both models share the same battery bay dimensions and HXE-W01 part number. The connector pinout and BMS communication handshake are identical across both variants, so one cell covers both units without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the ETI-L platform. The BMS balanced correctly at full charge, and the low-voltage cutoff triggered cleanly at the expected threshold without premature shutdown.
• Cold-start after power interruption: After fitting this cell, power the GPS on outdoors before driving. A full power removal forces a cold satellite start — first fix can take 5–10 minutes. Subsequent warm starts drop to under a minute once almanac data is cached.

GPS accuracy reduced at low battery on the ETI-L11

Some GPS units step down receiver sensitivity when cell voltage drops below a threshold — roughly 3.5V on the ETI-L platform. The receiver continues to function, but position fix quality degrades noticeably. You may see the position marker drifting on straight roads or losing lock in moderate tree cover. Keeping the cell above 3.6V maintains full receiver sensitivity.

ETI-L11 shutting off without low-battery warning

The on-screen battery indicator on the ETI-L11 reads from a voltage curve calibrated to the original cell. A degraded or mismatched cell can show two bars and cut off within seconds — the indicator hasn't caught up to the real voltage drop. This happens because voltage collapses faster under GPS-plus-display load than the indicator expects. After fitting a fresh cell, run one full charge-discharge cycle so the unit can re-calibrate its cutoff reading against the new cell's discharge curve.