the most powerful AA batteries

these are just awesome batteries!
low self-discharge means that you can sometimes even invite you in advance, and not only shortly before the planned use. You can not do with conventional Ni-Cd or Ni-MH batteries. which after a few weeks lying around again empty.

and especially the eneloop xx offer to the bitter end, the full voltage. is particularly noticeable in flash, the need always longer with other battery until the flash is charged again. or digital devices that just turn off when the voltage is low, even though the battery is still half full. the xx keep the 1.2 volts until they are empty, and function by "finicky" devices significantly longer.

is important but-as with all batteries that you use a charger with intelligent single channel monitoring. otherwise you get broken even these high-quality batteries. the best recommended device to the BC-700 (to have brand names from 20 euros under various)