Four cell 3600 mAH LiIon battery for the Maxxum Dynax 7D.

Two groups of two 3.6v cells wired in parallel.
Charging is by barrel connector on board using DPS-9000 charger (just takes longer).
Will power the D7 for extended shooting (time lapse). Haven't run it down yet.
Longest tested was about 8 hours continuous for interval shooting at night.
Alternate output from connector using various DPS-9000 power adapters.
5v adapter can power PDAs or MP3 players (Archos) for days or even weeks.