As well as being more ecologically sound than Ni-Cd batteries, Nickel Metal Hydrides offer more power than equivalent size Ni-Cd's and don't suffer memory problems.6V 4000mAhCompatible with-Akai : PVM2, PVM4, PVMS8, PVSC20, PVSC40Blaupunkt : CC824, CC834, CC844, CC874, CC894, CCR350, CCR540, CCR550, CCR570, CCR650, CCR800, CCR805, CCR806, CCR808HiFi, CCR810, CCR815, CCR820, CCR830, CCR835, CCR840HiFi, CCR850, CCR877, CCR880H, CCR890H, CR4