Hi all!
I've been lurking these forums since before the Incredible came out & I've noticed ALOT of confusion about car chargers & their ability to keep up with power draw of the Incredible when using the GPS. Under these conditions, some people report their battery dying a slow death even when attached to a car charger, while others (the lucky few?) report their battery taking a charge even while using the GPS. And it seems that the Froyo update has made matters worse. It got me thinking - Why does the phone charge slower in the car than from a wall outlet? So I did a little digging & found some of the answers at ironically.... androidforums.com! (The mods have GOT to be laughing at us!)
To find out what kind of charge you Incredible is taking, press Menu>settings>about phone>battery. Under "battery status" it will say either "Charging USB" (limited to 500 milliamps) or "Charging AC"(apx. 1amp).
What I've found is the phone decides what kind of charge to accept. But how does the phone know? I googled "USB pinout" & found that there are only 4 pins/connectors/wires in a USB cable (yea, I've never looked that closely at a USB connector...) - Power (limited to 5v), ground, & two pins for data. The phone decides what kind of charge to accept by "looking" at the data terminals. If the terminals are shorted to each other, the phone knows that this is a dedicated charge mode & charges the battery at a higher amperage (Shown as AC). The data pins, which are the 2 center pins, can either be shorted by the car charger and/or the wire connecting the charger to the phone.
This webpage: http://forum.xda-developers.com/showpost.php?p=6675250&postcount=51 shows with (blury) pics how to crack open you car charger & solder the two center data pins.
You can also disect your USB/micro charge wire & short the data wires (white & green), but - HUGE BUT! - do not plug this modified wire into your computer USB port as this could damage the computer USB bus due to the fact that it is only rated at 500MA. Another word of caution: you may not want to modify that cheepo car charger thats rated at 500MA - it probably won't last long trying to push out a full amp. I found the car charger I have not only has the #2 & #3 data pins shorted at the charger but ALSO the retractable wire is shorted too!
Lastly, if you have a car charger that shows an AC charge on your phone post up the brand name & where you got it. I found that HTC makes one.
The charger I have is made by "Cellular Innovations". I bought it at TJ Max for less than $20. It came with a car charger, home charger, a retractable mini cable & a retractable micro cable. It was labled at 1A & my phone shows an AC charge in the car.
Good luck finding or modifiing your car charger.
Oh & some of those answers I found on androidforums.com? The HTC Desire guys have been discussing this since May: http://androidforums.com/htc-desire/75062-charging-usb-ac-differences.html
I've been lurking these forums since before the Incredible came out & I've noticed ALOT of confusion about car chargers & their ability to keep up with power draw of the Incredible when using the GPS. Under these conditions, some people report their battery dying a slow death even when attached to a car charger, while others (the lucky few?) report their battery taking a charge even while using the GPS. And it seems that the Froyo update has made matters worse. It got me thinking - Why does the phone charge slower in the car than from a wall outlet? So I did a little digging & found some of the answers at ironically.... androidforums.com! (The mods have GOT to be laughing at us!)
To find out what kind of charge you Incredible is taking, press Menu>settings>about phone>battery. Under "battery status" it will say either "Charging USB" (limited to 500 milliamps) or "Charging AC"(apx. 1amp).
What I've found is the phone decides what kind of charge to accept. But how does the phone know? I googled "USB pinout" & found that there are only 4 pins/connectors/wires in a USB cable (yea, I've never looked that closely at a USB connector...) - Power (limited to 5v), ground, & two pins for data. The phone decides what kind of charge to accept by "looking" at the data terminals. If the terminals are shorted to each other, the phone knows that this is a dedicated charge mode & charges the battery at a higher amperage (Shown as AC). The data pins, which are the 2 center pins, can either be shorted by the car charger and/or the wire connecting the charger to the phone.
This webpage: http://forum.xda-developers.com/showpost.php?p=6675250&postcount=51 shows with (blury) pics how to crack open you car charger & solder the two center data pins.
You can also disect your USB/micro charge wire & short the data wires (white & green), but - HUGE BUT! - do not plug this modified wire into your computer USB port as this could damage the computer USB bus due to the fact that it is only rated at 500MA. Another word of caution: you may not want to modify that cheepo car charger thats rated at 500MA - it probably won't last long trying to push out a full amp. I found the car charger I have not only has the #2 & #3 data pins shorted at the charger but ALSO the retractable wire is shorted too!
Lastly, if you have a car charger that shows an AC charge on your phone post up the brand name & where you got it. I found that HTC makes one.
The charger I have is made by "Cellular Innovations". I bought it at TJ Max for less than $20. It came with a car charger, home charger, a retractable mini cable & a retractable micro cable. It was labled at 1A & my phone shows an AC charge in the car.
Good luck finding or modifiing your car charger.
Oh & some of those answers I found on androidforums.com? The HTC Desire guys have been discussing this since May: http://androidforums.com/htc-desire/75062-charging-usb-ac-differences.html