Behind its sombre matt-black styling, the WM-BF28 was really a restyled WM-BF22, and was similar in most respects. The point of interest was that the WM-BF28 was supplied with a rechargeable battery and charger, though two normal “AA” type cells could be used instead. The rechargeable battery, type BPC-700K, could be bought separately and used with other similar models. Text copyright © Walkman Central. Unauthorised reproduction prohibited.