Many will be on the sim card.... do you have another phone to swap it into? mx:))
take the sim card out and put it in another phone
if you have a usb cable it might give the phone enough life to retrieve the numbers..
Even old phones take sims.... My oldest phone is from '92. mx:))
Take the battery out, count to 30, put the battery back in and plug it in.
you can take it to a phone store or Radio Shack and they'll figure it out for you.
should power up while charger plugged in