B-90SU (2AA each) workd with the BR401 200-899

Displaying extreme speed, the B-90SU can charge two AA batteries in around 115 minutes or four in 255 minutes. It holds up to four AA batteries (included) and two AAA batteries (available for purchase separately), and even allows simultaneous charging of the two types. With its battery protection system, it helps gain optimum performance from the high capacity Ni-MH batteries by preventing overcharging of the battery. The ultra-compact size and removable AC cable let it fit comfortably in any bag, making it ideal for the user on the move.