Battery problem??

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Hi all!
I just got a MDA Compact II, but damaged, here is my problem:
Without a battery:
On the charger he turns on and shows the initial screen (some picture + IPL SPL GSM OS) 3 secs orange led coms on for a moment and device reboots,
no problem to put in bootloader ( 3 col + IPL SPL)
With a battery and charger:
after reset somtimes shows the same picture for a moment but without IPL SPL GSM OS, and go > off
no problem to put in bootloader ( 3 col + IPL SPL)
With a battery no charger:
off
somthimes screen blinks...

The guy who sold it to me sad that he was trying to change device language... and that happend.
I thing he interrupt a ROM change, and maybe somthing else??
Can it be battery damaged or wrong dll as i reed??
maybe is there a way to make my commputer to turn on a 5v in usb to act like a charger then bootloader>rom update?
Sorry for my english
Regards
Tom

its working now:
The problem was in the phone soft, as i write it i thing was interrupted ROM upgrade and MDA did not see a battery. No way to put in bootloader mode in USB cable on computter. So i take look on a battery: she hawe 6 connections 2 first and 2 last ar the + -. So i take a risk and connect battery from my SPV C500 (4 connect pins) to 4 middle pins on the battery conecton in the phone using the rubber to hold it , and WOW it camed ON. Next bootloader>T-Mobile ROM update...
And my phone is working now on the old battery, and thats intresting - the old battery was 70% charged!!
Maybe it help somone ))

Tom
PS. Sorry for my english

well, realy nice and usefull post. maybe admins may post this solution into FAQ. hope this will help also others, not just charmer owners...