Ipad 1no signs of life

I found an old ipad 1 in the loft hooked it up to my iMac, after an hour i got the image of an empty battery on the screen, but the battery has two gaps, one each end about a third of the way in, I did a reset and the mac says, itunes has detected an ipad in recovery mode, click on restore, when it gets to preparing update for restore I get unknown error 1600, and that's it, anyone got any idea what it can be, and is it repairable, or just a door stop.