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The battery status only shows up when the satnav is disconnected from the charger. Your first charge should be a continuous charge until the battery is full. This can be done by connecting it to your computer for 8 hours approximately or 4 hours to your car cigarette lighter socket or 4 hours to an, optional extra, mains charger.
You need a genuine Garmin car charger to both charge and see directions at the same time. If it is a non - Garmin lead you can't charge and use at the same time. the Garmin at the same time. Otherwise the unit just goes into sleep/pc mode. It took a long time to get to the bottom of this, so I thought I'd pass the information on...
If the lighter socket is working ok then it may be the fuse in the charger plug that's gone. It can be replaced by unscrewing the silver ring at the end of the plug and removing the fuse. A replacement fuse should be available from garmin dealers.
From dead flat it takes about 9-10 hours do not leave on charger for more than that otherwise you will overheat and burn it out. After each use recharge for about 3-4 hours depending on whether the unit has been used for that lengthyof time
Press the reset button - you'll find it on the lower right of the Nüvi
255, but it doesn't look like a button. It's basically the sticker with
all the information on it. It's just enough to push the sticker
carefully with something small, not too sharp so it doesn' get
destroyed. The Nüvi reboots, the loader loads and proceeds with the
software load. Once this is over, shut down the Nüvi and reconnect to
the PC. Then, everything works fine (it did at least for me).