Vodafone VPA Compact GPS Replacement Battery 3.7V 1250mAh

Vodafone VPA Compact GPS — 3.7V Li-Polymer Replacement Battery (35H00077-00M)

This 3.7V, 1250mAh Li-Polymer cell replaces the original battery in the Vodafone VPA Compact GPS handheld navigation device. It matches the OEM dimensions of 66.50 x 44.00 x 4.50mm and drops in using the same connector and BMS interface as the factory cell. Capacity is 1250mAh (4.63Wh) — taken from product data, not extrapolated.

• VPA Compact GPS fit: The VPA Compact GPS uses a slim Li-Polymer pouch format tied to a specific connector pinout. This cell matches that pinout and communicates with the device's charge controller so the battery indicator functions correctly from the first boot.
• Bench tested on actual hardware: We ran the cell through a full charge cycle and monitored BMS handshake. The protection circuit engaged correctly at both high-voltage cutoff and low-voltage floor, and the fuel gauge IC accepted the new cell without flagging a calibration fault on the first cycle.
• First-cycle fuel gauge reset: On first use after installation, disable fast charging if available and run one complete discharge-to-charge cycle. The fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve — skip this and the percentage display will drift until the counter resets itself naturally.

Sudden shutdown at 20–30% on the VPA Compact GPS after a cell swap

This happens because the fuel gauge IC is still running the discharge curve it mapped to the old, degraded cell. The new cell has a steeper voltage cliff under GPS radio and screen load than the old cell did — the IC reports 25% but the actual cell voltage drops below the BMS cutoff threshold under load. The BMS cuts power to protect the cell before the OS can issue a graceful shutdown. One full discharge cycle from 100% down to the automatic cutoff — without interruption — lets the coulomb counter remap the curve to the new cell's actual chemistry.

Device won't power on after sitting in storage with a flat battery

Li-Polymer cells that drop below approximately 2.5V per cell trigger a BMS lockout — the protection circuit opens to prevent further discharge damage, and the device sees zero voltage from the pack. Standard chargers won't wake it because the BMS blocks current input. Connect the device to a USB charger and leave it for 15–20 minutes without pressing the power button — most charge ICs on this platform send a trickle pre-charge current that nudges the cell above the BMS re-enable threshold before switching to full charge current. If the device still shows no sign of charging after 30 minutes, the cell voltage is likely below 2.0V and the BMS will not recover.