Replacement Battery for ME572C

I need to replace the battery in my Asus Memo Pad 7 (ME572C). I'm having trouble finding where to buy a replacement. This tablet wasn't widely distributed but there were a number of similar models (including the Nexus 7).

1. Does any one know what the part number is for the battery? I've seen references to both 0B200-00420900M or 0B200-00420600M.

2. As mentioned, there were a number of very similar models released by Asus at the time. Are batteries for any the other similar tablets compatible with the ME572C?

2. Where I can buy a cheapish replacement battery for it?

Many Thanks