About this replacement
Medion GoPal E4435 / MD97182 — 3.7V Li-ion Replacement Battery (338937010168)
This is a 3.7V 750mAh Li-ion cell for the Medion GoPal E4435 and GoPal E4430 portable GPS navigators, including MD97182 and MD96050 variants. It replaces OEM part numbers 338937010168 and T300-1. Fit the battery when the original cell no longer holds a charge or the device shuts down during active navigation.
- GoPal E44xx and MD-series navigator fit: These models share the same 3.7V single-cell architecture, connector footprint, and BMS handshake protocol — the battery communicates charge state directly to the navigator's power management IC, which is why cell voltage tolerance matters more here than in simpler consumer electronics.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on GoPal E4435 hardware. The BMS held the low-voltage cutoff at the correct threshold and the navigator's battery indicator tracked charge state accurately across the full discharge curve.
- Cold-start satellite acquisition after fitting: After installing this battery, power the device on outdoors and let it run a full satellite acquisition before navigating. GPS units perform a cold start after any complete power interruption — first fix typically takes 5–10 minutes while the receiver rebuilds its almanac data, versus under a minute for subsequent warm starts.
Why the GoPal E4435 drains faster during active navigation than standby
At 750mAh, this cell is working at the lower end of GPS navigator capacity. Active navigation runs the GPS receiver, the display backlight, and the map-rendering processor simultaneously — that draw is several times higher than standby. Screen brightness is the single biggest variable you can control: drop it by half and the load on this cell drops noticeably. Avoid running active navigation while connected to a car charger with a low-output USB port, since an insufficient charge rate means the device draws net from the battery even while plugged in.
GoPal E4435 shutting off without a low-battery warning
This happens when the battery indicator is no longer calibrated to the actual cell's discharge curve — the navigator's power management IC hits the hardware voltage cutoff before the on-screen warning has time to fire. It is common after fitting any replacement cell, because the old calibration data was stored against the original battery's characteristics. To recalibrate, run the device from full charge down to auto-shutdown without interruption, then charge it fully in one uninterrupted session. After one full cycle, the voltage-threshold warning should reappear at the correct state of charge.