after 1 year usage of my HTC One I'm still very satisfied with that phone . The only problem is the battery doesn't last as long as in the beginning. I'm running the original htc sense with android 4.4.2. I don't even get through the whole day with hardly any usage. For example: I undock the phone in the morning (about 6.00 am), until now (10.00 am) I watched about one 5 minute video, listened to music for about 10 minutes and used facebook for a few times. I only got about 60% left. This is quite less, as I have done everything possible to reduce battery usage. I did disable vibration on keyboar, disabled all not used connections (bluetooth, nfc, ..), reduced display brightness, disabled not used applications.
How long does your device last? Is this extreme draining of battery usual?