I'm trying to work out the amount of watts my mobile phone uses and thus how much power it needs to charge back to full power. My handset is the Nokia 820 Lumia and the specs are as follows: Battery 3.7v, 1650mAh.
I have calculated the watts by using the following: (1650mAh x 3.7)/(8 x 1000) = 0.76 with 8 being the talk time in hours when on 3G. However, I have become confused when reading the specs of the handset on CNET where it states the following: Power Consumption Operational: 55.0W Standby/Idle: 3.0W
Can anyone explain what the Power Consumption Operational is? This is what is confusing me. Does this mean that the handset is using 55W when fully operational and if so, how much wattage is needed to charge it (ie if I'm using the phone & it's charging).