fb-reader for pocketbook sense

The battery of my beloved pocketbook 360 is almost dead and I can't get another one (bizar!) so I have to look for a new e-reader and I thought I could go for a pocketbook Sense.
On the 360 I always use the fb-reader. Is it possible to get the fb-reader for the Sense? And if so, where?
I know the Sense can read the fb2 format, but the fbreader is fantastic as everything in it is customizable. The adobe reader is worthless by comparison.
So
1. does anyone know how to get a new battery for the 360?
2. does anyone know how to get a good version of the fb2 reader on the Sense?

Thanks!
jane