Actually there is a almost soupcan light with the battery configuration you are interested in, 2S2P. It is the Niteye Eye40 which is more the four separate reflectors and lenses in a square cluster configuration, similar to the BlackShadow Terminator, the Nitecore TM26 and the Imalent you linked to. Head size is very close to the Terminator and larger than the TM26 or Imalent. It uses a battery holder similar to some lights from Fenix, Thrunite and Jetstream but in the 2S2P configuration you are interested in. The light has a number of unusual features for the class including a battery charge indicator, magnetic ring mode selection, removable handle and internal charging of batteries capability.
Review link:
Illumn currently has a few left on clearance for the best price I have ever seen. Still not cheap though.
http://www.illumn.com/special-deals/niteye-eye40-xm-l-u2-3000-lumens-4-x-18650.html
Based on the photos and text the Imalent battery holder you linked to seems to be a 4S configuration.