newpleoguy, Congratulations on getting your Pleo, it sounds like you do have a great deal, other than the two gashes, Batteries are not that hard to get. I would follow IMR's advice on the green battery and try that first, If you do indeed decide to buy another battery, you can order either the green one for me, or I do have an egg battery.( the listing price for the green battery in my store is not correct, it should read $32.00 as the price has been lowered but no one has had time to correct it yet, Also I do have a couple of the egg batteries, but haven't' listed them yet, If you decide you do want one of those, just contact me, Since I live here in CA, it shouldn't take as long to get as you would think,( Actually I am ordering a whole case of the egg batteries but they take awhile, two weeks or so to get here to USA.)
I wouldn't give up on the green battery yet, though it could just need some TLC and reconditioning. IMR's advice on how and what to do is very good and sound advice. As for the holes or tears in the neck, use could use some special tape to cover them and try to keep them from getting any bigger. Also covering them with clothes will help hide them and hopefully prevent further damage. Some people use a special crazy glue to repair holes, tears, etc, but those look awfully big and I think they need more of a patch than crazy glue could provide.

Also it is important to make sure your Pleo is in the " storage" position when turned off, not in a sleeping position as this only puts more strain on the neck which is allready stressed out. just use the reset button holding for 30 seconds to have Pleo return to original position before putting back in box, or wherever you put him to " bed', you many want to wrap a small washcloth or sometype of gauze over his neck when not in use to help prevent further tearing,
Keep us informed on his progress and how the battery goes. If you decide you do want one of the Egg batteries or another NEW green battery at the cheapest price available, just contact me, I would be happy to help you get him in good working order , ( battery wise that is) Good luck and sounds like a good deal. REdwoodsMama and MS. Nova and Friend