Tell us more about the recorder and microphones you plan to use, and
how you will use the recordings. There are portable recorders that
can record for 12 hours or more using their internal battery alone.
(Sony PCM-D50 is one example.)
Assuming you will need an external battery, check your recorder's
external AC adapter to determine what DC voltage and amperage it
provides to the recorder. Use this to guide your selection of an
external battery pack.
A few external battery solutions mentioned here in the past week include
http://www.laptopsforless.com/portable-dvd-battery/pr2e.htm
http://www.bixnet.com/5v7libapa.html
http://www.bixnet.com/mumiexbapaki1.html
http://www.bixnet.com/misihicabapa.html
http://tinyurl.com/8zjel8 (Amazon.com)
http://tinyurl.com/96fpmb (Amazon.com)
Here's a forum that talks about battery power solutions for
long-duration recording
http://taperssection.com/index.php/board,25.0.html
And here's a fellow that makes custom C and D cell battery sleds with
the proper electronics and connector to power different recorders.
These are expensive, but work well.
http://www.sonicstudios.com/batsys98.htm
--oryoki
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