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The type of batteries to use are LiFePO. LiFePO keep their potential right up to the end.
Here is someone who has done a lot of DIY using LiFePO batteries to build PSU and they seem to be even better than the (basic model of) Paul Hynes LPS.
http://tirnahifi.org/forum/viewtopic.php?p=76790#p76790
Cheers
That's a nice design - for me batteries are a no go, other then portable.
You should try the Nanophosphate® ANR26650M1-B from A123 systems ( http://www.a123systems.com/lithium-ion-cells-26650-cylindrical-cell.htm )
They are well known for their exceptional performance in audio gear.