FYI : a new T62D (test!) firmware is available at
http://42.121.0.77/cms/firmware/Test-T62D/2015062909/ .
After removing the Chinese apps, installing XPosed, XPrivacy, AFWall+, FBReader, Google Play Services, etc.... and disabling WiFi, I get - compared to my T61 - quite decent battery life (5 days and counting, with about 1 hour/day reading).