>Thank you all for a flood of very useful information and advise. I was
>not expecting this much and am very grateful for everyones input.

You are welcome. Oh, and in my previous post I meant to mention, you said 
that much of the size of the thing was due to an AA cell? It may be worth 
looking at changing it to a Cr2032 or similar button cell to get the size 
down, before going too far down the marketing path. Having some method of 
changing the battery would be good too ... 

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