Ok, so we just got home from a 10 hour drive. I was driving a U-Haul. The truck had USB ports in it. I plugged into it. About an an hour or two into the trip I noticed the battery was about 50% full. (It was 100% when we left.). I then switched it to a cigarette lighter charger. It shows the voltage on the charger. It had a tad over 14v. Typical... Not low voltage. Well, plugged into the cigarette lighter it kept draining even lower. Then it was drained where it kept rebooting, charging to 1% and rebooting continuously. I then tried charging it with a 20,000 mA charger. It's always worked in the past. It wouldn't charge the phone to where I could turn it on. I had to switch to a TracFone for navigation to get home. The TracFone charged just fine in the truck. The TracFone was about 50% charged. Plugged into the cigarette lighter, it charged to 100% and stayed charged. I was thinking my phone must've just gone defective. But now we're home and I plugged into an outlet and it's charging just fine. So, why will my phone not charge in a car anymore?