I had a hard time finding a replacement battery for my E280. Radio Shack online has a kit for the E280R. I emailed Sandisk asking if the battery kit the E280R would work in the E280 and they responded yes. They also said that Sandisk no longers carries batteries for the E280.
I found other, cheaper batteries on line but I also read reviews that stated some of those batteries did not work.
I ordered two from Radio Shack.
I will post again when I receive them.