Is there a rechargeable version of this battery?

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http://www.amazon.com/s?ie=UTF8&keywords=cr2%20rechargeable&rh=i%3Aaps%2Ck%3Acr2%20rechargeable&page=1

http://www.amazon.com/Crazy-Cart-3-7v-Re..._2?ie=UTF8&qid=1345129674&sr=8-2&keywords=cr2+rechargeable

(BTW found plenty of links with bing).

The problem is that those are rechargeable lithium and will be about 3.7V

is that too high for your application?