QUOTE(lardman @ Jul 12 2006, 12:11 PM)
It may be to do with the more accurate battery level reporting.
OZ doesn't lie about the percentage - this means that even when fully charged, one of my batteries immediately falls to 80%.
Time it and see is probably the best bet, but I'd imagine that OZ is better.
I just switched from Cacko, and it definitely isn't worse in OpenZaurus, in fact, I think it is better (on C-1000).