I order 123 Lithiums for my SureFires from Cutlery Shoppe. They have good prices for bulk purchases, ~$3 each.<br><br>I have also purchased NiCad packs and converters for my SureFires. This makes the 6P about 2" longer, but is much cheaper in the long run and allows me to use the lights without being concerned that I am eating up $6 worth of batteries. My EDC SureFire(s) always have fresh 123 Lithiums, but my bedside and car torches are powered by rechargables.<br><br>I have also converted to rechargable NiMH batteries in AA size for most of my high drain electronics...SW radio, cameras, flashlites, GPS etc. This is great for "normal" use but I also maintain a rotating stock of AA size Lithiums and regular alkalines for emergency backup use.<br><br>All my HAM gear is old and still using NiCad packs or AA's. But I do have a large Lead acid gel pack for extended emergency use at base locations. This happens to be a car starting cell with high capacity. Other local HAMs have converted old video camera packs for emergency use. <br><br>I also carry a 12V-120V converter for use in the car. I can charge packs or run directly from this power source.<br><br><br><br><br><br>