Lumia 820 User here. Well I have my phone for almost 3 weeks now and as every single day have passed it seems my battery consumption goes higher and higher. Sometimes it wont last a full day..maybe 5-8 hrs.. My phone is mostly on standby but with Internet sharing on. Only 4 are activated in background task. Well my question is what more do you consider buying or investing to your 820. A extra OEM Battery or those portable chargers with high maH?.... Well I know some of you will say it depends if I like to open the back cover always and put in the battery or just use a plug & play charger without taking off anything. Still I want your thoughts and Opinions..