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Are you charging through the computer or wall charge,I charge my Garmin 255w with a wall charger for about 3 hours and I have all the bars.There are different strengths of chargers but even so,overnight is excessive,try a different charger.
I connected the unit to the car charger instead of the USB charger and then held down the reset for 10-15 seconds, after which the system would show the computer connection on the charger and then boot up when not on the charger.
The Garmin C330 has an internal Lithum Ion battery that needs to be recharged. Use your USB cable that came with the device to connect it to you computer. The computer of course has to be on. Leave it connected to the computer all day or over night. After that time it should be charged completely. If it is not charged after that time the unit will have to be returned to Garmin to have the battery replaced.
If you left your Garmin c330 on running
the battery will have 1% life left. If you turn c330 back on again, it
will flash screen for 3 seconds then die, even charging it at this
point will not wake it back up. TO BRING IT BACK TO LIFE... plug in the
power home or car into Garmin c330. There is a tab in the front Garmin
gray frame of your screen. You must take like your fingernails and
under the logo "GARMIN" pull the whole gray plastic frame off.
Underneath the plastic frame to the right hand side. There is a "RESET"
button. Make sure power is plugged in while hitting reset. Your battery
should come back to life. Cheers