KIU solution will certainly work in this host. The charger linked above is the 9cell charger.. you need twelve cell charger.. no time to search for the link but batteryspace has it, it's great it's what i use for my Mag100s.
If i diddn't have a tri-bore 3D for 100W i would buy this exact light.. no monkeying around with battery packs, it's all done.. this plus a hotdriver for 100W.. bango. presto mag138.
The small ream reflectors don't fit the 100W lamps.. it's not a difficult process to make the ream bigger if needed.. but the normal 'LOP' MOP etc reflectors have a ream big enough for the PR base and work just fine with 100W lights.
If you want to use this host with 1166 lamp and hotdriver it will be an excellent host.. with only 2A draw you can use over 2000mAH cells vs the low capacity high output CBP cells.. and get over an hour of runtime!
Direct-drive you can run the 64623 lamp also 100W. want whiter with more flood.. the 64625, but that requires regulation.. and 11 cells (the PIR can work with 12 cells).
-awr