Question about Garmin Nuvi 255WT 4.4 in. Car GPS Receiver

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Garmin 225WT won't charge from the 12V car cord or via USB. Replaced the battery twice in last 2 days. GPS works when plugged into the vehicle. What causes this?

My Garmin 225WT won't charge from the 12V car cord or via USB. Have replaced the battery twice in last 2 days. Suspected the first replacement battery might be faulty. GPS works when plugged into the vehicle. What causes this?

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  • John Warner Jan 10, 2013

    I tired 2 new batteries to ensure the battery was not the problem. Although I have not tried an AC-powered charger, I have tried charing in the vehicle for about 6 hours total. The charge did not improve. I also accessed the technical page. When I plugged in the USB cord, the page says the battery is charging. Eventually is says the battery is "done". When I unplug the USB cord. The charge drops from 100% to less than 75% in less than a minute. Is there circuitry in the GPS that might not be working correctly and preventing charging the battery?

  • John Warner Jan 10, 2013

    Tring an AC-powered USB charger. The technical page shows Power Src as "USB" and VMAX that varies from 4.88 to 5.01V. When I unplug the USB cord, the Power Src shows "BAT" and VMAX show 3.88V. This seems reasonable since the battery is a 3.7V battery. However, the Batt Capacity quickly drops to 77-78%. Exiting the technical page shows a battery icon with 3 of 4 bars green. This appears to be consistent with the 77-78% Batt Capacity. I'm wondering if either there is faulty circuitry in The GPS or it might be out of calibration somehow.

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SOURCE: Garmin Nuvi 760

Sounds like you both have a battery problem. I experienced a similar problem when trying to charge via the USB-cable connected to my computer.
Ended up buying an original charger (expensive) and the charging went smooth.
The car charger should in any case work fine, so probably your battery is not very healthy.

Try holding your finger on the battery symbol for about 10 sec. The unit will then switch to a technical page. There you can observe the battery and charging voltage. When I plug in my computer USB-cable, I read around 4,4V and that is not sufficient for charging my battery.
When connected to the original charger, this voltage rises to about 5V which gives a nice charge. When unplugging charger, the unit displays the battery capacity. If the charging voltage is OK, but battery capacity drops quickly after you unplug charger cable, the battery is probably bad. (Of course you have to charge is for some time) I think around 4V battery voltage give 100% capacity. 3,9V gives about 90% capacity.
This will not solve your problem, but can give you an idea about what is wrong.
Good luck.

Posted on Nov 17, 2008

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SOURCE: garmin nuvi 750 battery does not hold a charge

A new battery can be purchased and installed inexpensively. I found a video.
You-Tube video "yxP4PdRB_98" placeholder (do not delete)
http://www.newpower99.com/ProductDetails.asp?ProductCode=GARMIN+NUVI+750

Posted on Dec 26, 2009

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1. Pull off face, press reset tab.
2. If unit wont turn on or if turns off immediately, connect to home computer using mini usb on side of gps (any usb cord that fits will do). This will charge the internal gps battery, which is discharged.
3. You will not be able to see the gps charge indicator while the usb cord is plugged into the unit. To check charge level, disconnect it, turn it on, and note the large "battery" icon.
4 Do you have a dead internal battery? If the gps holds a charge from your computer usb port, you don't.
5. If you have a dead battery, Google DIY replacement. With some soldering it can done for $15 total.
6. If you don't have a dead battery, the issue is charging from the cigarette lighter socket. Your car socket may have blown a fuse (check car manual). Your charger unit may have blown a fuse (unscrew the tip, check fuse inside). Also, some car sockets don't work when the ignition is off. Test yours.
7. There is a good chance the connection of the charger wire to the gps cradle is the problem. Fiddle with that. Replacement cradles are available for the c340 at about $25.
8. If your unit is not charging from the cradle/socket, buy a 12v usb cord. Plug into socket and into usb port of the gps. This is a workaround or alternative to buying a new cradle.
9. IMPORTANT: observe the "battery" icon while driving, esp. if you have doubts about charging. Basically, if you can see the icon, you're not connected to an outside (car or computer) power source. That is, if you can see the battery-charge indication, it means your battery is currently discharging and unless you get another power source to work it will be dead in a few hours.

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