right now i use the energizer NiMH 2500mAh ones and they are great. long life, works fantastically in my 580ex, dont have to order them online because they are super readily avaiblble at any local store. but time has come to buy alot more batteries (picking up 3 vivitar 285hv's) has come. i think i will stick with the energizer NiMH unless there is something substantially better. as for a charger ideally, i want something that will charge 8 batteries at once, and can do a hard charge in 15 min. does any product like this exist?