I read in many posts how the battery life is so bad in windows phone 10, however, this is not the case in my device (Lumia 1520 running Windows 10 TR). It is even better than 8.1. I charged my battery yesterday, unplugged at about 6:00 PM, used my phone for calling, reading email, checking news via Flipboard and WPCentral among others, playing candy crush few times and also checking the web for other stuffs. Now after about 24 hours still have 20%. My phone freeze twice, and I forced restart it. Still not prefect for daily use, but battery life will encourage me to continue using windows phone 10..