i-Blue 737 GPS Replacement Battery 3.7V 1000mAh HXE-W01

i-Blue 737 / 747 Series — 3.7V Li-ion Replacement Battery (HXE-W01)

This is a 3.7V, 1000mAh Li-ion cell replacing OEM part HXE-W01 in i-Blue portable GPS navigators. It fits the 737, 737 A+, 747, and 747 A+ along with nine additional models in the same series. The cell measures 52.96 × 33.64 × 5.15mm — verify those dimensions against your existing cell before ordering.

• 737 / 747 series compatibility: These models share the same battery bay dimensions, connector pinout, and 3.7V nominal rail. One cell covers the entire platform without modification.
• Bench tested on actual hardware: We cycled the HXE-W01 replacement through charge and discharge on a GPS navigator load profile. The protection circuit engaged correctly at low-voltage cutoff and the cell accepted a full charge without thermal event.
• First-fix after installation: After fitting this cell, power the unit on outdoors before your first outing and let it acquire a satellite fix. GPS units perform a cold start after full power removal — first fix can take 5–10 minutes while the receiver rebuilds its almanac. Subsequent warm starts run under a minute.

GPS accuracy reduced at low battery on the i-Blue 737

The i-Blue 737 receiver draws more current during active satellite tracking than during standby. When cell voltage drops toward the lower end of the 3.7V nominal range, some GPS receivers step down receiver sensitivity to reduce current draw. The result is weaker satellite signal processing and a wider position error on screen. Keeping the cell above 3.5V under load preserves full receiver performance.

Unit shuts off without warning before the low-battery indicator triggers

This happens because the on-screen battery gauge is calibrated to the original cell's discharge curve. A new or partially mismatched cell hits the BMS low-voltage cutoff threshold before the visual indicator reaches empty. The fix is to run two full charge-discharge cycles so the device relearns where the cell's actual cutoff sits. After cycling, the warning should align with shutdown at roughly 3.2–3.3V.