I have the exact same problem using an LG - MS770, Android 4.0.4. I have been using Evernote to keep a dream journal. Thus, as I often open the app and begin typing immediately upon waking, sometimes in the middle of the night, I am often tired and sometimes fall asleep before I finish typing what I intended on including in a note. There have also been a few times I have been composing/editing/reading a note and set my phone down to go do something else, forgetting to close the app before I did. Boy, was I ever sorry I left it running. If I leave the app open, regardless of whether I touch the screen or press any buttons, the app forces the screen to keep running (at full brightness, no less) and refuses to let the screen go into sleep mode. Even when the battery reaches a critical level, Evernote keeps draining the battery for no good reason. It *will* do so until the phone dies. The last time I fell asleep before closing the note, I awoke 3 hours later to find my phone off. I had just charged it to full capacity before going to bed, so this seemed very odd and I thought perhaps I accidentally pressed the power button. So I attempt to turn the phone on to find it had turned itself off after being drained to a critical level of 2%. Keep in mind this happened in a matter of mere hours from a full battery. My battery will normally last about 24 hours or more when in idle. Evernote is *the only* app I have on my phone that refuses to let the screen time out and drains the battery to death. I agree as another user, Avi, stated that "this is a critical feature!!!". If other apps can manage not to inadvertently drain your entire battery, why can't Evernote? I could understand concern over not wanting to save changes to a note that have not been prompted/confirmed by the user, however simply allowing the screen to time out and "sleep" would be very helpful and frankly altogether necessary. I have to disagree that unlocking a screen is more annoying than dealing with a dead battery. Also, Evernote does NOT ask me to enter a pin…ever. I’m not sure if this is supposed to be the case, but I never have to enter my pin to access anything. All I want it to do is turn the screen off after a long period of time has passed… Sure, I could understand having to unlock after a few minutes would be frustrating for some people…but come on, three hours? four hours? five hours? Where does it end? Is it really reasonable to demand the screen be on at full brightness for five continuous hours? I think if no input is detected after one hour, it’s safe to say the user is busy with something else, and even if they aren’t, turning the screen back on after one hour is not a major inconvenience. Could you at least make the screen dim after a long period of time has passed? I don’t think anyone would disagree that forcing a screen timeout once the battery reaches a critical level is anything but a necessary feature. If your battery is at 3% do you really want Evernote to keep running when you're not even using it? I think this should at least be an option. .I have only been using the app for a few months, but I have begun using it more often, and it would be a shame if I had to trash it. I just can't take the risk of being without a phone when I need it or missing calls because Evernote made my phone die.