Batteries have been around for many years, but they led earlier in the shadows. With capacities of 400 to 500 mAh (AA) they were only partially successfully compete for traditional battery. This has changed fundamentally. Intensive research, new systems and materials and care in production are the secret of Duracell (Procter & Gamble). The Supreme is one of the best rechargeable batteries on the market, the (if high performance is required) is superior to any battery in certain applications. With a good quick charger (1hour) the battery is charged and ready to fix. Assuming 250 charge cycles, then a charge will cost a maximum of 1-2 cents. So you will save 199 batteries. Anyone can calculate yourself how much that would cost and how much waste can be saved every year. There is in my opinion almost only advantages. As disadvantage I can think of only the self-discharge, due to which I merely some lowest - keep CONSUMERS beschicke with classic batteries, for example, in the remote control 1-2 years. The Duracell Supreme is all brands I tested consider only Varta is possibly equal. The stated capacity of 2450 mAh is less than that specified in some NoName, but measured genuine and realistic (which I have taken from a test). Important for best performance and long life is the care handling. How looks can be found by searching the Internet. My first Duracell even after more than 100 times recharge within 2 years still top. From me there for 5 star. Oh, I mark my batteries with a permanent felt-tip pen, so I do not mix old and new and not confusing.