Originally posted by gemini but there are not lithium rechargeable batteries for km?
The K-m takes AA batteries. The lithium-based rechargeable batteries are called lithium-ion (Li-Ion), and they do not exist in AA format. There are lithium-based AA's (Energizer brand), but they are not rechargeable. But Eneloops and similar "low self-discharge" / "hybrid" NiMH rechargeable are every bit as good as Li-Ion batteries, and cheaper and easier to find to boot, so there would be no reason to *want* a Li-Ion battery for for the K-m. There are also new zinc-based rechargeable AA's that are supposed to work very well.