MY NAVMANF20 WAS WORKING NORMALLY AND WAS PLUGGED INTO A POWER POINT WHEN A MESSAGE APPEARED SAYING THAT THE BATTERY IS LOW AND IT SHOULD BE PUT ON CHARGE. EVENTUALLY, THE BATTERY WAS EMPTY AND I CANNOT NOW SWITCH IT ON.DOES THE BATTERY NEED TO BE REPLACED AND IF SO WHERE CAN ONE BE PURCHASED?
The most likely cause is that the internal mini usb socket on the unit has started to come away from the internal pcb. This is a common fault with the F20 unit. It is not an easy repair. (unfortunately)
Tony, July 2009
Have you tried replacing the fuse in the cigar lighter charger plug , it unscrews and contains a small 20mm fuse
jk, June 2009
have you tried changing your charger if that doesnt work it might be your battery.you might get a new one on ebay
