I'm using the Boroda version and have no battery drain problems + after a bit of a struggle, no problems installing the desired fonts.
Instructions and download are here:
http://translate.google.com/translat...a3&sl=ru&tl=en
Then scroll down to item 4:
Sticky: [Poll] Russification Sony Reader 350/650/950 (ver. boroda)
the userStyle.css I'm now using is listed here:
https://www.mobileread.com/forums/sho...6&postcount=64
Hope this helps - and thanks to those who helped me get this right!