Can people tell which charger gives enough power to charge the Desire during heavy use (3G data+gps) ? My old one (Genuine HTC Pharos) is supposed to give 1A but my Desire keeps discharging (slowly but surely).
1A is sufficient.
The problem is in the charger! The data wires need to be connected to each other.
The USB 1/2 standard allows 500mA. If you connect your Desire to the computer, the phone has to know that it cant pull more than 500mA or you can damage your computer. Desire knows this as it can tell when the data wires are connected to each other.
Desire needs about 700-800mA when using data, gps and other at the same time. The 500 allowed mA from the computer are not enough to charge the battery at the same time. If your charger is able to provide at least 1A the data wires in the cable or in the charger needs to be connected to each other! This is the case in HTC original car charger.
Look for chargers with at least 1A. You can build your own cable or strip the cable you have today and connect the white and green wire (with each other) going to the phone. If you do this, dont use the cable with a computer. Just for charging. It's best to do the modification in the plug. Open it up and make sure that the middle pins make contact with each other. In that way you can use any microusb-cable to charge your phone in the car.
Yea, should work. But You need to be superduper sure about the Amps output of the charger. There are stories on the forums about chargers that are too weak to charge the phone during GPS + GPRS operation. I wonder if they would menage to charge a phone operating just the GPS (non GPRS related turn-by-turn navigation program). Anyway, in case You buy one of these, give us a call if it menages to charge the phone like it should.
It's not just about the amps i'm afraid.
Edit:
You can tell if your cable/plug are correct wired.
Go to Settings - About the phone - Battery
Look what it says.
Charging (USB) or Charging (AC).
It should read AC to give the power needed in heavy use and it will, IF your charger gives at least 1A and the data wires connected with each other.
You can have like 50A but it makes no difference. The phone will only use 0.5A if.. well, you get the point.
I hope my English is ok.
Edit again.
I found this, same info.
http://xdaforums.com/showpost.php?p=6443313&postcount=18