I found somewhat of a fix to the SDS100 and BCD436HP issue of having to carry around extra batteries. I recently came across some belt holsters for AA batteries online , which work very well. But me being a leathersmith I designed my own type of belt holster made to fit AA batteries for which I have free open-source patterns if anyone is interested in making their own. I've found its much easier having a belt pouch for extra batteries then carrying them in your pocket. As for the SDS100, a company called Rothco makes a bag called the "Excursion" which would fit two of those batteries, although any small belt pouch would work.