This is a dedicated battery holder (compatible product) that allows the use of AA batteries in the K-50, K-30, and K-r camera models. It is very difficult to obtain because the manufacturer has stopped selling it. It uses four commercially available AA batteries (lithium batteries, nickel-metal hydride rechargeable batteries, alkaline batteries). When using lithium batteries, it is possible to take approximately 1250 photos without flash. It will be shipped via Yu-Packet Post.