My car charger port stays on when the car is off, so I bought the only car charger usb port I could find with an on/off switch (http://www.thinkgeek.com/product/eea9/). Unfortunately it only has one USB port. I'd like to use it to charge my phone as well because the USB ports in my car have low power output. Will this supply enough power to run a B40-C dash cam and charge a phone at the same time? And are there any recommendations for USB splitters to buy? The ideal form would just be a male USB connector that splits into two cables with female USB ports at the ends. I've seen a couple on Amazon, but only for data, not charging.