Right then, thats what I always do, take an idea for an field expedient temporary fix, then make it my normal routine, then find the cheapest batteries to use for it.
And we wonder why there are Darwin Awards.....sheeze!
ITS A TEMPORARY FIX, SAVE A DIVE, USE ONLY WHEN ABSOLUTLY NECESSARY TECNIQUE PEOPLE!
5-AA battery packs or 2-C 3.6v lithiums are the recommended battery packs for the Meg Apecs system. They give 3-6 month, or 6-12 month service, are easy to make, easy to order (from ISC) and the prudent diver will have extras on hand, aleviating the need for temporary fixes.