These batteries are just the same as the Sanyo Eneloop AA batteries. If anyone doesn't know what Eneloops are , they are batteries that unlike other rechargeables keep their charge for months , staying ready to use. I use them and they are like night and day compared to other rechargeables. Panasonic bought out Sanyo's battery division so these are Sanyo batterys with the Panasonic name on them. Sanyo Eneloop 4 packs are £7.50 ish so at £4.75 delivered they are a steal.