No, it's completely random.
Sometimes battery icon works, sometimes (90% of time) no!
I'm going to install the JB build 1.22a.
see you soon
EDIT: in JB battery icon works fine. For this build si available a kernel with swap support?
EDIT 2: I just installed your JB build version 1.3a. Battery works also here, but... it's so slow! Need a kernel with swap support.