SyncUp & Drive kills batteries/alternator

Roderinmichigan t-mobile full of bs I called the nearest store told me I had to call customer service to return the device back

I don't have phone service with them just got internet service with them..

Call customer service to lock in your intent to return.  You'll likely have quicker service if you can get to a t mobile store.  If not, good luck on waiting for a mailer.  We've already several mailers behind and waiting over 6 months on a mail return.  I recommend changing providers.  That's what we are getting ready to do.

Rodgerinmichigan how do I contact t-mobile to send it back I'm new to this I just received the syncup yesterday and do I get my money back. 

At your own risk and don't trust what t mobile says.  My mechanic says it almost fried my cars power management system.  I ripped mine out.  Plus you'll get very anoid at the constant notices when someone is using the car and it dawned on us we were now open to having our car hacked.  if you're in your 14 days, get rid of it while you can. It's a gimmick and dosnt do anything your phone in your pocket can't do except kill your car battery and power management for me a $1200 part.  RUN AWAY!

I just purchased  the syncup drive is it safe to use I have a new car 2021 kia forte can someone please give me some information on it

It's December 2021 and this is apparently an ongoing issue.  I received to back to back low battery warning just now and the first about 12 hours ago.  I'm pulling it out of the car and returning it and canceling service on the device.  It should have been fixed 2 years ago when these reports started coming in. 

I've had this problem twice but not with T-Mobile, it was with the Verizon Hum. I figured out what the fix is. After you drive your vehicle, make sure to TURN WIFI OFF from the app!! The wifi staying on constantly will slowly kill your battery. It's fine driving with the wifi on, but if you know your vehicle will be parked for over an hour or two, just turn off wifi to be on the safe side. Once I did that with the Hum, I didn't have anymore problems. I just got my Syncup today and I'm following that same rule as I did with the Hum. Hope this helps. 

did anyone got help from tmoible? i am having the similiar issue with my battery. The syncup drive shows offline and the battery dies more often in my nissan rouge. I never had this problem. My car even starts acting weird while driving. I am scared to drive car in this condition.  but reading this thread, i came to know it is because of the syncup drive. i unplugged the syncup drive, after coming here and seeing other people had the same issues. How can we make tmobile pay for this damage? 

I have been thinking of getting some thing like this for my truck. Reading these responses brings back memory of a PANIC I had, the truck had lost the belt at night (the alt., power steering, water pump belt). After the belt was replaced, there was little charging, noted as the voltage was at the nominal 12.8V. So there was a nail biting trip back 230 miles worth. With some research, I found that the vehicle was smarter than the driver, there is a charge control on the negative cable, to extend battery life.  So during the day time driving the voltage is kept about the 12.8V, but most of the time at night (or with headlights on) voltage does go up to 14V, presumably for the 14V headlights, or when the battery is cool and needs charging.

Now for the 'kills the battery' it would be possible to drain a battery through that connection, but it would take some time.  The OBDII line that powers the plug has a 15A fuse, so current high enough to over power a 150A alternator, that does not figure.

This fact finding will apply to most all GM vehicles.