None that I know of...

Please send bug reports to wmapm@speck.ml.org and
describe the problem as detailed as you can.

Note: all apm statistics are taken directly from
/proc/apm.  If you see odd behavior with WMAPM
(such as displaying battery time remaining without
a corresponding percentage), please first check
the statistics in /proc/apm to see if the computer/
kernel are properly reporting the applicable
statistics.