Thinking about an HP-41CL

[smp]

Cruff, Bob and Angel, thanks very much for your responses.

I am psyched. I just scored a nearly mint HP-41C on eBay, through a Seller that I've dealt with before and who I trust:

http://www.ebay.com/itm/142062053596?_tr...EBIDX%3AIT

I know that I probably just paid way too much for it, but I fell in love with its pristine condition. And there was the trust factor I have with dealing with someone that has done well by me in the past.

Now, if I could only score a good rechargeable battery pack for it. Does anyone have any good pointers for that?

I also found this battery shield on eBay (I have not yet purchased):

http://www.ebay.com/itm/162095517736?_tr...EBIDX%3AIT

Has anyone used one of these (I've never seen one of these before)? If so, do you recommend using one, or is it a waste of time?