Yep 6.6v LIFe here. Just removed battery tray, soldered on a connector and job done. The battery is help in on velcro, i added some lead weight into the bottom too as it was alittle light for my liking afterwards - weird i know
Apparently, if you go to a BRCA official event it is not allowed due to being 6.6v rather than 6v from 4 AA's - not a problem for me and i would be surprised if they checked but who knows
