I've encountered quite the charging conundrum and I am very eager to hear if the community has any answers for me.
I recently bought a dual-USB 2A car charger for my galaxy nexus (link). I have had trouble with an older charger in the past that didn't put out enough current, and using navigation on the phone, even when on the charger, would draw down the battery. I found that I needed a 1A charger (and the phone in AC, not USB, charging mode), to at least maintain charge level when using the phone.
I have 4 different micro-usb cables, all of which are data/power cables (no shorted wires). When I plugged in the cable that came with my phone to the new usb car adapter, the charging state was listed as USB. I was rather annoyed, figuring that I'd have to crack the adapter open and do some soldering to get it to charge as AC, not USB. But before I did that, I tried another cable and, lo and behold, it registered as AC charging. Again, that was a data cable. Of the 4 cables I tried, only one of them would charge in AC mode.
To expand my test, I hauled my HP touchpad w/ cyanogenmod out to the car to see if I could get it to charge. The touchpad is either discharging, or charging in AC mode, there is no USB charging state. And the touchpad requires 2.0 (or 2.1, I can't remember) A to charge. All 4 of the cables worked, charging the touchpad in AC mode. So it seems like the cables are capable of charging in AC mode, at least for the touchpad.
Adding to my confusion/annoyance, when I use the cable that came with my phone and plug it into the little samsung wall wart that came with my phone, it also says it's charging in USB mode. But when I plug it into the HP wall adapter, it says AC mode.
Can anyone explain to me what is going on? Why does the GNex seem so sensitive to the exact cable used to charge in AC mode and why does the provided cable/charger not charge the phone in AC mode? Has anyone else experienced this odd behavior?
I recently bought a dual-USB 2A car charger for my galaxy nexus (link). I have had trouble with an older charger in the past that didn't put out enough current, and using navigation on the phone, even when on the charger, would draw down the battery. I found that I needed a 1A charger (and the phone in AC, not USB, charging mode), to at least maintain charge level when using the phone.
I have 4 different micro-usb cables, all of which are data/power cables (no shorted wires). When I plugged in the cable that came with my phone to the new usb car adapter, the charging state was listed as USB. I was rather annoyed, figuring that I'd have to crack the adapter open and do some soldering to get it to charge as AC, not USB. But before I did that, I tried another cable and, lo and behold, it registered as AC charging. Again, that was a data cable. Of the 4 cables I tried, only one of them would charge in AC mode.
To expand my test, I hauled my HP touchpad w/ cyanogenmod out to the car to see if I could get it to charge. The touchpad is either discharging, or charging in AC mode, there is no USB charging state. And the touchpad requires 2.0 (or 2.1, I can't remember) A to charge. All 4 of the cables worked, charging the touchpad in AC mode. So it seems like the cables are capable of charging in AC mode, at least for the touchpad.
Adding to my confusion/annoyance, when I use the cable that came with my phone and plug it into the little samsung wall wart that came with my phone, it also says it's charging in USB mode. But when I plug it into the HP wall adapter, it says AC mode.
Can anyone explain to me what is going on? Why does the GNex seem so sensitive to the exact cable used to charge in AC mode and why does the provided cable/charger not charge the phone in AC mode? Has anyone else experienced this odd behavior?
