I'm looking for a battery for a (hobby) project, and I'd be interested
in any suggestions.

Requirements (most are flexible):
* Needs to be quite small; the usual AA/AAA are a bit bigger than I'd
like.  Something about the size of a CR2032 would be great, but could be
a bit bigger.

* Current needs are 5-10mA continuously (a small PIC and other bits),
with regular short bursts of about 30-50mA (driving a 40kHz ultrasonic
transducer).  The battery would ideally last at least half an hour.

* This project may occasionally be dropped, possibly from ~10 feet.
It's not a disaster if a removable battery comes out at impact, but I'd
hope it wouldn't be too damaged.

* Preferably rechargeable, so I don't have to keep buying more
batteries.  I'd be willing to build a simple charger (eg with an
easy-to-use IC) for it.

* Unless it's 5-6V (regulated down for the PIC), I'll need to work out
how to boost it to drive the tansducer with ~10V peak-to-peak.

Now that I write it down it sounds pretty difficult to achieve!  I'd
appreciate any suggestions.

Regards,

Chris
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