Mitac Mio C320 GPS Replacement Battery 3.7V 1150mAh

Mitac Mio C320 / C520 Series — 3.7V Li-Polymer Replacement Battery (BP-LX1320/11-B0001 SN)

This 3.7V 1150mAh lithium-polymer cell replaces the original battery in the Mitac Mio C320, C323, C520, and C520t portable GPS navigators. It fits the same battery bay and connector as the factory unit. Capacity is 1150mAh (4.26Wh), matching OEM spec.

• C320 / C520 platform fit: These models share the same battery form factor, voltage rail, and connector pinout. The BMS handshake matches across the C320, C323, C520, and C520t — no firmware flag or proprietary authentication blocks the swap.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the C520 platform. The BMS held voltage within tolerance at full GPS receiver load and maximum display brightness. No false low-battery shutoffs were recorded during testing.
• Cold-start satellite acquisition after swap: After fitting this cell, power the unit fully on outdoors and allow it to acquire a satellite fix before driving. A full power interruption clears the hot-start cache, so the GPS receiver performs a cold start — plan for up to 10 minutes for the first fix in an open-sky location.

GPS battery draining faster during active navigation than standby

The Mio C320 and C520 run the GPS receiver, map rendering, and backlit display simultaneously during active navigation. That combined load draws significantly more current than standby, where the receiver duty-cycles and the display dims or turns off. At maximum screen brightness on a complex map tile, current draw can exceed three times the standby rate. Reducing display brightness during navigation is the fastest way to extend available use time on a single charge.

Mio C320 shutting off without warning at low battery

This happens when the battery indicator is no longer calibrated to the new cell's discharge curve. The unit reads remaining voltage against a stored profile from the worn original battery, so the low-battery warning threshold triggers late — or not at all — and the device cuts off abruptly. To recalibrate, charge the replacement to full without interruption, then run the unit on active navigation until it shuts off naturally. Repeat this full cycle once more, and the indicator will track the new cell's actual discharge curve from around 4.2V down to the cutoff at approximately 3.0V.