I've recently found a bug in the BD Remote driver that in effect 
places too much restrictions on what raw data it expects to come from 
the remote. That raw data may or may not be the battery level (I'm 
still investigating). In either way, the next release should fix this 
problem. Please drop me a note, if it does not and I'll send you a 
debug version.

A fresh set of batteries with the same electrical specs (especially 
the mAh value) as those shipping with the remote may work as a 
temporary. I'd have loved to supply that mAh value to you, but my set 
of "Sony Super" batteries don't have any such data printed on them.

Best regards, 
Felix