yup. Nickel zinc rechargables. Higher voltage.
Up side is faster recharge rates, holds a charge amazingly well, recharges fast and they do not get hot charging or discharging.
Down side is they are higher voltage, so some equipment that checks for voltage will not work, some worry that the higher voltage will reduce life for flash lights, and with some equipment (the small inon strobe, for example), if you use the really fast recycle rate, the unit might over heat.
I started out carefully testing everything I own that uses AA, and it is all I use now.
The Next Generation Battery | PowerGenix
Odd thing is that people that have not tried them, or tested them seem to hate them. The Popular Science article comments are very typical. Is it Amps or Watts that are important? I have tested them in both strobes and LED lights, they last longer, so my guess is watts are what is important (most of the time). But if Watts are important then everyone is over estimating the capacity of most rechargeables, because they don't hold to that 1.2 volts.
Note: Don't recommend them in standard lights, as they most likely will shorten the life of the filament. LED's are a mixed bag, some are brighter, some are not, but all run longer and are brighter longer.