I just got two of these;
Amazon.com: XtremeMac IPU-IH2-11 InCharge Home for iPhone/iPod/iPad: Electronics
Dual 2.1 amp USB ports so I can charge ipad2 and my droid charge at same time.
I'm beginning to think that the DC cannot charge much faster than the standard OEM wall charger, especially if all the radios are running at full tilt.
The reason I'm saying that is because I just bought two car chargers, the Tek-Toc High Output Dual USB Port Car Charger for Ipad, Samsung Galaxy, Iphone, Blackberry, Droid, Gps, and Other Tablets, Smart Phones and High Powered Devices. Input: 12-24V DC; Output: 5.0V DC 2.1Amp!
I put used a CHARGE ONLY cable to connect the output from the car charger to the micro USB input of the DC...NO USB data connection was detected and the phone indicated that it was in charge mode. I loaded my navigation program, Copilot Live Premium (v9) with the GPS on, all location services enabled, screen manually set to about 60% brightness, 4G Automatic and Wifi OFF, Bluetooth ON with a connection to my Jawbone ERA headset.
The mount was in front of an air conditioning vent and the back of the phone was kept relatively cold. No thermal limiting of the screen or charge rate occurred.
The battery charge DROPPED about 1% to 2% every 10 minutes!!! Starting out with a fully charged and CALIBRATED battery, after a 45 minute trip I was down to about 90% of charge.
This leads me to think that the charging circuit in the DC is current limited. Too bad it won't even hold the battery charge when the screen, GPS and 4G radios are working!!!
With the ROM I have flashed, my normal battery life is really good. It took me about 18 hours to do a full battery calibration cycle...I was pretty much streaming video over WiFi (VZW data connection is very poor at my home).
Oh well...