Medion PNA400 GPS Replacement Battery 3.7V 2200mAh

Medion PNA400 Series — 3.7V Li-ion Replacement Battery (C03101TH)

This 3.7V, 2200mAh Li-ion cell replaces the original battery in the Medion PNA400, PAN405, Transonic 5000, and PNA-400 GPS navigators. It matches OEM part numbers C03101TH and E4MT062201B12. When the original cell degrades and the device shuts off mid-route or fails to hold charge, this is the direct swap.

• PNA400 series fit: These models share the same 3.7V single-cell configuration, physical connector, and battery bay dimensions (68.50 x 18.50mm), so one cell covers the full range without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a PNA400 unit, confirmed BMS handshake with the device, and verified stable voltage output from full charge down to the low-battery cutoff threshold.
• Cold-start satellite acquisition after swap: After fitting this cell, power the GPS on outdoors before driving. The unit performs a cold start after any full power interruption — first satellite fix takes 5–10 minutes. Subsequent warm starts drop under a minute once ephemeris data is cached.

GPS accuracy dropping at low battery on the PNA400

Some GPS receivers scale back antenna sensitivity when the cell voltage falls below a set threshold — typically around 3.5V on single-cell Li-ion units. On the PNA400, this shows up as slower position updates or increased positional drift before the device shows a low-battery warning. A worn original cell spends more time below that threshold during active navigation. A fresh cell at full capacity keeps the receiver running at full sensitivity for longer.

PNA400 shutting off without a low-battery warning

This happens when the battery indicator is uncalibrated against the actual cell — the device reads the voltage curve from the original factory cell, and a degraded or replacement cell may hit the hardware cutoff before the software indicator reaches zero. To recalibrate, charge the new battery to 100%, then run active navigation until the device shuts off on its own. Recharge fully without interruption. After two full cycles, the indicator and actual cutoff align reliably.