If it was me Id ditch that Radio shack AMP, and either get a Velleman 7watt AMP or a canuck kit193, both AMPS are available from Carls Electronics, Both easily have the ability to REALLY out perform the RS amp. Are you totally committed to a flash light housing?? I built my home brews using pelican cases, I use RC car battery packs they have a easy quick disconnect all I had to do was open the caller and unplug one plug, plug the charger in and It was good to go..
