Can y'all recommend a good battery charger/conditioner that also display how much "life" is in a rechargeable battery? I must have used up all the "life" in mine at Comicon because I had 2 sets go bad on me in my external flash unit (Canon EX580 II), even though the charger showed green for the AA batteries, and the flash would still power up the flash's display, but got no green light or red light on the flash, and the flash would not discharge a flash when needed. I'm also wondering if maybe my flash unit is eating batteries, as I would put in some other sets of rechargeable AA batteries I had on hand, and after 100+ shots, the AA batteries would be discharged to the point where the flash would not flash, but the display would still work. I was just bummed not having as much flash at my disposal for half the day, and had to re-adjust my shooting strategy for the rest of Sunday at Comicon. Granted I have used most of these rechargeable batteries for at least a year's time at 4-5 other conventions, so maybe I just destroyed them, and it's just time for new batteries.