These adapters convert AA size batteries into D size batteries.
SANYO, the worlds leading manafacturer of rechargeable batteries has put an end to the disadavantages of conventional rechargebale batteries. eneloop is ready to use straight out of the packet and will retain 85% of its charge in one year. Combine this with the fact that it can be recharged up to 1000 times and you can see why eneloop is the only battery you will ever need !