Panasonic Eneloop batteries have superb charge retention with 90% after 6 months, and 85% even after a year, so no need for regular charging to aviod permanent capacity loss required by many Ni-MH cells.
Due to this the cell can be used immediately after purchase and you do not need to charge them first!
Eneloop cells retain a much higher voltage under load, the voltage does not collapse when high currents are pulled, which is an unwelcome characteristic of normal AA Ni-Mh cells.
Over double the cycle life of most Ni-Mh cells, over 2100 cycles are possible!
Dimensions: 50 x 30 x 30mm