Typhoon MyGuide SilverGuide 5000 GPS Replacement Battery 3.7V

Typhoon MyGuide SilverGuide 5000 — 3.7V Li-ion Replacement Battery (541380530001)

This 3.7V 1250mAh Li-ion cell replaces the original battery in the Typhoon MyGuide SilverGuide 5000 and SilverGuide 5000 NAV portable GPS navigators. It matches OEM part numbers 541380530001 and BP-L1200/11-B0001. Capacity is 1250mAh (4.63Wh), identical to the factory specification.

• SilverGuide 5000 and 5000 NAV fit: Both variants use the same battery bay dimensions, connector pinout, and voltage rail. The 5000 NAV adds preloaded maps but draws from the same cell at 3.7V — one battery covers both.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the SilverGuide 5000 platform. The BMS engaged correctly at low-voltage cutoff and accepted a full charge without triggering thermal protection flags.
• Cold-start behaviour after fitting: After fitting this cell, power the GPS on outdoors and let it acquire a satellite fix before driving. A full power interruption forces a cold start — first fix can take 5–10 minutes while the unit rebuilds its almanac. Subsequent warm starts are under a minute.

Why the SilverGuide 5000 shuts off without showing a low-battery warning

The SilverGuide 5000 uses a voltage-threshold system to estimate remaining charge. When the original cell ages, its internal resistance rises and voltage sags faster under load than the indicator expects. The device hits the hardware cutoff voltage before the software warning has a chance to display. After fitting a fresh cell, run two or three full charge and discharge cycles so the device can recalibrate its threshold readings against the new cell's actual discharge curve.

Saved routes and POIs missing after battery replacement

Some GPS navigators store user data — saved routes, custom POIs, recent destinations — in battery-backed SRAM that loses its state the moment power is fully removed. Swapping the battery cuts that power, which clears volatile memory even if the internal flash holds map data. If routes are gone after the swap, they were in SRAM and are not recoverable from the battery itself. Re-enter critical destinations before the swap or export them to the SD card first using the device's backup function.