Lumia 820 major Battery Drain issues

Having used my Lumia 820 since last December it has been great but in the last 2 months I've suddenly found my Battery draining really fast. I replaced the battery thinking as it is 7 months old and I am not the best at charging properly it might have an issue but the new battery is exactly the same immediately.
I've isolated it to two things - playing Music via Audiocloud or Nokia Music (triples battery usage such that 75-80 minutes of playing flattens my battery, and using Here Maps route navigation which give about 60 minutes before flattening a fully charged battery. On a recent road trip even with the phone being plugged into a charger the whole trip several times the phone switched off as all power drained.
Any suggestions?

No they aren't. Any application / Game or other such thing that requires higher processing power will result in generating more heat thereby making the phone felt somewhat WARM and will also drain the battery relatively quickly. Only if the phone is getting HOT, you may get the device inspected by Nokia Care technician ..

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    [IMAGE http://i.imgur.com/M2to9.png]
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    [IMAGE http://i.imgur.com/2HNdV.png]
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    [IMAGE http://i.imgur.com/4tbyY.png]
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    [IMAGE http://i.imgur.com/XMT0y.png]
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    Sorry for the MANY mistakes, my English is not good =\.
    Cheers from Brazil!

    Hi Folks,
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    Devices;     16GB iPhone 4 with IOS6
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