Bought 2 new batteries for this T-Mobile MDA and now the third one said 100% when I unplugged it and then plugged it back in and then the light went to red. All three of these batteries can't be bad??? I tried a new wall charger/car charger too..Nothing works..anyone have an answer??
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Re: T-Mobile MDA won't hold a charge
If you insurance on your phone I recommend using it, I had a MDA for a couple years and had about every problem in the book, but not that one. It sounds like you've done everything possible, the only other thing i could think of is a hard-reset. Anything beyond that would tinkering with the internal hardware.
I think you can get a MDA pretty cheap on ebay these days
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Your battery has been depleted past a chargable state. This is a due to a bad design in the phone that doesn't monitor the battery power state well enough. It actually allows the battery to be taken under the minimum amount needed to recharge the battery.
You can fix this, but do so at your own risk.
You can simply purchase a new battery, that will work, just been sure not to let it deplete the battery totally anymore.
Now, on to the fix
-Take out the battery. -Get any usbcable you can find sitting around. (any usb wire will do, an old printer cable, anything with a usb end that can plug into your computer) -cut one end of the plug off. You need to leave the side on that connects to your computer. Cut off the side that plugs into a device (printer, camera, web cam, etc) -Strip the rubber off the wire and expose the wires inside. -Separate the wires from each other. You will only be using the BLACK and RED wires. -strip the very end of the black and red wires carefully using a wire cutter exposing the metal wire inside the red and black covering. -Plug in your home made battery charger to your computer. Careful not to touch any exposed metal, as it will give you a small shock. ****WARNING**** DO NOT UNDER ANY CIRCUMSTANCES ALLOW THE RED AND BLACK WIRE TO TOUCH EACH OTHER ****WARNING****
-now carefully hold the black wire to the negative terminal on the battery (it should be noted with a black circle with a - in the middle). Then touch the red wire to the positive terminal (it will be noted with a red circle with a + in the middle).
Hold the 2 wires there for 20 seconds. Then quickly plug the battery back into the phone, and then plug it into a regular charger. Give it little bit of time, if you've done everything correctly the charge light should come on.
I had to repeat the last step again to get the light to turn on indicating it was charging.
You must not hold the wires to the battery for too long, 20 seconds should do it. You can overload a battery with this trick and actually make it explode if you hold it there too long. You are well within the few minutes needed to detonate the battery due to overcharging by sticking very strictly to 20 seconds.
Just be careful and you'll be fine.
One you get a charge light give it a few minutes in the off position, then try powering up the device and keep it plugged in until you get 100% charge.
Mda Vario's don't charge when turned off, heres what you do.
cut wire off a usb lead the small end strip the red and black wires, put the red wire onto the posative connection where the battery is it tells you what side is posative and negative on the battery, use black with negative and red with posative making sure that no wires touch the other metal strips in the phone, replace battery plug usb into computer and start up the mda and wait for it to boot. once turned on leave to charge as it will charge through the wires connected to the battery, after 10 to 15 minutes plug in the actuall charger and try to remove usb wires without taking battery out. if that is not possable it is ok as the battery should have enough power to start up once it starts leave to charge and always keep some charge in the phone.
I had the same problem, but got the idea to "jump start" the battery from Googling the problem. At night, I had turned off my MDA to charge the battery and then in the morning, couldn't revive it. I removed the battery from my MDA, and determined which battery terminal was positive (far end of one side) and negative (far end of the other side) by using a multi-meter. BTW: Battery was still @ 3.5V (okay…battery was still alive, if just barely). Then, I found a 5V DC charger (5W Max output = ~1A) from my bluetooth headset. I used one wire (CAT5E) and connected it to the negative side of the adapter (outer sleeve - again, verified by multi-meter) and another wire to connect to the positive tip of the adapter. I had to strip about 1/2-inch of the insulation off of the wire on the DC adapter side, and about 1/8-inch of the wire on the battery side. Plugged in the 5V DC charger and then I touched the negative wire to the negative battery terminal and held it there, while I touched the positive wire to the positive battery terminal for about 30-45 seconds. Put the battery back in the MDA, started it up, and now it's charging on the regular MDA AC Charger that came with the phone. Problem solved.
Okay, I searched and searched until I found a solution that worked for me. I tried the USB thing, I got my phone to turn on once, but never to charge. Here's what I did:
(Do this at your own risk) I zapped my battery with a 9v battery. One wire on each terminal and then held it to the MDA battery (positive to positive, negative to negative) for about three seconds. I did this about five times. (Don't let the wires touch while they are connected to the 9v battery.) I IMMEDIATELY plugged my phone into a wall charger, NOT my computer (The computer wouldn't charge my phone). As soon as it was connected to the wall charger, I turned it on. After starting up, the orange light came on, and it started charging. I was skeptical about this solution at first, but trying everything else I resolved to do this and then if it didn't work buy a new battery, but it worked and my MDA is charging as I'm typing. The original ideal came from a post on the xda-developers website by dew1989. I added the additional steps that got my battery charging again. I hope this helps!