Battery for GPSMAP 276c, 376c, 378, or 478 is not holding a charge

If the device says "Charge Complete" but the battery indicator does not fill up 100%, then this is an issue with the internal software not being able to read the actual charge of the battery. This behavior might also be indicated when the device displays "Battery Missing".

This issue can be fixed with a few steps. The first step is to update the internal operating software of the device to the latest version. For information about updating the operating software, please review the Related Content.

After the software update has been applied to the device, turn the device on and let the battery completely drain itself. When the device powers itself off, fully charge the battery. It would be recommended to completely drain the battery one more time and fully charge again.

At this point, the device will be able to read the accurate charge level of the battery.