The SF Beast holds 20 CR123s, the M6 six. There are several different brands of AA lights that hold eight batteries in a compact fashion. Different Pelican dive lights hold 6 to 8 C and D batteries side by side. As far as inline lights, Cold Steel made a 7-cell AA model, and Kel-Lite made a 5-cell C that could hold up to 12. Several brands including Nordic and Code-4 could be threaded together to make any length you'd like, but that's not an official single light.