that's awesome that the pre chargers work. 3 months ago, when I thought my pre was awesome and I'd keep it for awhile, I bought 6 or 7 chargers. I was hoping I wouldn't have to reinvest.
the reason I wondered though is because I have a monster usb ipod car charger that I thought would charge my pre...it wouldn't. It tried but the phone actually used more power sitting there than the charger would provide. It must be a lower mah charger.