[kgvickers]

Stumbled onto this:

If wired correctly, it should enable me to use my old mini-usb plug Motorola cell phone chargers with my iPhone. I'm already using this with the motorola chargers and a sync cable (but I end up with about 3 feet too much cable):


Everybody in my family has an iPhone and someone is constantly loosing or breaking the OEM chargers/sync cables (especially the genuine Apple sync cables . . . they suck!). We've got a pile of the old mini-usb chargers so now I should be able to put them to good use.

[sting7k]

I would be worried about the motorola charger not supplying the correct amps and current and ruining the battery.

[kgvickers]

Your point is well taken. The little Apple cube shaped chargers are 5 volts dc and are rated at 1 amp. Those Motorola chargers with the mini-usb plugs are 5 vdc and are typically rated at 550 milli-amps (mA), or 0.55 amps.

I've got an electronics salvage store close by and I've played with plenty of different chargers with usb outputs. So far, as long as they meet the 5vdc and a minimum of 550 mA my 3Gs will allow charging. But anything less than the 550 mA and it won't go into charge mode.

I'm an electrical engineer by training but I have to admit that I know little about battery technology. Based on what little research I've done, batterys are not damaged by low charge currents but can be damaged by too much charging current.

I'd love to hear from some battery experts on this.

Cheers,

Keith

[OrionAntares]

I would be worried about the motorola charger not supplying the correct amps and current and ruining the battery.

The battery wouldn't be the concern in this case but the charger itself. If the device tries to pull more current than the charger is designed to supply it can over heat and possibly melt the charger.

[mtmckay71]

that's why we have iphone insurance......