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Slow charging on non-Moto branded chargers?

Z

zapper65

Lurker
Has anyone taken the time to sit down and compare the charging hardware for Motorola phones and I mean, really digging down into the nuts/bolts/resistors of it all? I've noticed on my Bionic that it charges slowly on a generic Belkin USB charger but it will about cook itself sucking current from a Motorola AC-USB adapter.

I know on Apple devices they use a SE1 on the data lines to indicate whether to pull a high current or low current charge - 2.0-/2.0+ for low, 2.8-/2.0+ for high (if I'm reading the schematic right).

Has anyone looked into this for the Bionic as well? Or is there some other signalling that the Bionic is using to determine how much current to pull?
 
In this case no, since I've been working between an ac adapter with all Motorola components, a Belkin car usb adapter with a LG-branded cable (carry-over from my last phone), and a generic usb cable that's plugged into my computer.

The Moto adapter/cable combo is without a doubt the fastest to charge, however the Belkin adapter with an identical output rating is barely able to maintain the phone's battery level when it's plugged into the Bionic's car dock. Charging straight off the computer (USB2.0) is a bit slower than the adapter but overall not too bad.

I can understand the slower charge from the computer due to USB port current limitations, but the difference between the car and ac adapters is significant enough for me to wonder what is different electrically between the two to cause the discrepancy.
 
I have started to wonder that also. I just went on a road trip last weekend and used my bionic as the gps on the car dock and an hour and a half into the drive I was at 51% battery. Not sure why my phone is losing charge when it is plugged into the cardock?
 
Yea that the same thing I saw when I first got my Bionic. If the phone was on I could not get it to charge off my car/car dock.
 
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