Even do i have the unit on charge mode most of the time .the buttery only lasts a few minutes if i run it with out ac power.i think the buttery is gone and how do i change it.the unit is about 3 years old and it works fine otherwice.
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it probably has a Li-ion battery and they start loosing the ability to hold a charge just as soon as they are manufactured. If your Garmin sat on a store's shelf for a year, it had already lost about a third of its ability. Li-ion batterys last about 3 years.
Two years is actually pretty good for a rechargeable battery in regular/constant use. Lithium-ion rechargeable batteries have around 500 recharge cycles and then will loose capacity very quickly as for your unit.
This internal Li-Ion battery will now need to be replaced.
This is kind of a late response, but this post may help other people. I had the same issue and was ready to have Garmin exchange my battery until I called them today and spoke to Tech support. They helped me upgrade the firmware on the unit (didnt take long) and so far the problem has been resolved. I have had it on for two hours without fully charging it, which is better than before when it only stayed on for about 20 minutes. I recommend that people with this issue call them first since it appears to be a common issue with this model nuvi.
Follow the onscreen instructions to Download WebUpdater
Click Run when prompted
Follow the onscreen instructions to install WebUpdater
WebUpdater will run automatically once installation is complete
Follow the onscreen instructions to update your Edge
If the above steps do not correct the issue, then you can carry out a master reset on the unit as a last resort: Note: The master reset will clear all user data including training history from the unit
Turn off the Edge
Hold down Mode + Power
Select Yes when the unit asks if you want to erase all user data
After resetting your Edge, leave it with a clear view of the sky for about 30 minutes without moving it to acquire a GPS fix