If you are complaing about battery on the belle, then i suggest to not download belle refresh.
I did and now i'm loosing about 10% battery power each hour.
After 8 hours at work i go from 100% to less than 20% battery and i have to recharge the phone when i get home.
And that's when the phone is on idle, and i never use my phone at work.
So don't update it.
You will also get alot of extra programs that you can't uninstall like microsoft apps, lynx and alot of other software !