I recently bought 8 AAs and a charger. A co-worker gave me the idea to use a label maker and label each battery to keep track of use and life left (date of purchase and number), great idea. My labels read, 12/2012 #1, 12/2012 #2 and so on. It's nice that I can keep track of which batteries get used and how much. I haven't used them long enough to comment on their longevity or even recharging but from reviews and testimonials I've read, they seem to be the #1 rechargeable battery out there.