iGpsport BSC100 Replacement Battery 3.7V 700mAh AHB363450

iGpsport BSC100 / BSC100S — 3.7V Li-Polymer Replacement Battery (AHB363450)

This is a 3.7V, 700mAh Li-Polymer cell replacing the original AHB363450 inside the iGpsport BSC100 and BSC100S handlebar-mounted cycling computers. It restores full power to the GPS receiver, display, and navigation functions after the original cell has lost capacity through repeated charge cycles. Dimensions are 52.20 × 34.70 × 4.20mm — verify against your existing cell before fitting.

• BSC100 and BSC100S compatibility: Both models share the same battery bay dimensions, voltage rail, and connector orientation, which is why one cell covers both. The BMS inside each unit reads the same 3.7V nominal and 4.2V charge ceiling — no firmware difference affects battery acceptance between the two variants.
• Bench tested on actual hardware: We ran this cell through a full charge cycle on a BSC100 unit and confirmed the BMS accepted the cell without fault flags, the charge curve hit 4.2V cleanly, and the GPS receiver powered on without reset loops.
• Cold-start behaviour after fitting: After fitting this cell, power the device on outdoors before your first ride and let it acquire a satellite fix. A full power interruption forces a cold start — first fix can take 5–10 minutes while the unit rebuilds its satellite almanac. Subsequent warm starts drop that to under a minute.

Saved routes disappearing after a battery swap on the BSC100

The BSC100 stores some session data and route segments in volatile memory backed by battery voltage. When the cell is fully removed, that memory loses power and the data is gone — this is a hardware limitation, not a fault with the replacement cell. Before swapping the battery, export any saved routes via the iGpsport app or USB connection to a computer. After fitting the new cell, re-sync routes from the app to restore them to the device.

BSC100 shutting off without warning before the battery indicator hits zero

After a full battery replacement, the fuel gauge inside the BSC100 is uncalibrated against the new cell's discharge curve. The unit's low-battery threshold was tuned to the aged original cell, so it can trigger an abrupt shutdown before the on-screen indicator shows critical. To recalibrate, run the new cell through two full charge and discharge cycles under normal GPS use. After that, the indicator tracking tightens and the visual warning fires with enough margin to save data and end navigation cleanly.