Thread: Maglite torch Mods

This is some questions for the more electrical minded folk on here.

I have 2 Maglites that are OK, but wouldn't mind a bit more grunt from them and want to use rechargeable batteries instead of Ds.

Americans seem keen to Mod everything and have found a article that turns a 2D lite into a 1000 lumen Cree LED light that runs off Lithium Ion batteries.
Problem is the Maglites I have are a 3D and a 4D.

Am I correct in thinking that if I try to put more than 2 batteries in series, the Voltage will be too high compared to what the initial Mod with online 2 batteries?
If I try make something that'll run the 3 or 4 batteries in parallel, the Voltage shouldn't be too high but there will be more Amps, which is a good thing as Amps are what dictates how long the light will run for?

According to the Cree website the XML T6 chip is meant to be run at 3.1V, so a bit confused as to how folk have run their Maglite of two Li Ion cells that ar of 3.7V each.

Can anyone fill in the blanks, or tell me where I may have gone wrong.
Cheers