What drains battery ?

Is there any good apps that can show you which component/app that drains your battery. Don´t think that the inbuilt in android works that well as you only see system and not the actual componenet.

[Q] Wifi drains my battery life

I've been using my Note 5 for a week and a half now. Like anyone else when I get home from work I switch from LTE to my home wifi (Linksys EA9200 Triband) the main bands I connect to are: 2.4hz( For it better range) band and the 5hzAC(When im close to the router for faster speed). I leave the phone connected all night even as I sleep. From what noticed the battery drains faster when connected to either band by as much as 10% - 15%. I had this same issue with the Note 4. I'm currently in the middle of testing out how much more the battery lasts by using LTE instead while I'm home. I've searched online but, couldn't find anything about Samsung devices and this particular router not playing well together. I attached my current LTE stats so far for today. Normally by now if I was connected to wifi for the same amount of time as it shows below I would be @ 82% battery. Someone please help I'm:eek: yanking out my hair here.. :eek:

samsung Galaxy S4 I9500 is shut off itself + Battery Drains after turning it on!!!

I've been using my S4 I9500 for about 3 weeks. everything's fine but, the phone just shut off itself randomly while using it. After That I can't turn it on again unless I remove the battery then put it again, but unfortunately when I turn it on ... 3 seconds and same thing happen again. When my S4 I9500 shut off itself battery drains super fast, I mean for example before it shut off itself the battery was 60% ,, after I turned it back on it is 12%!!!!!!!:crying::rolleyes:
This also happen sometimes when I launch my camera.. :confused::(

Neither the battery nor the phone always feel warm when that happen. I totally have no clue why this happened. anyone here is experiencing the same thing with your s4 I9500? :confused:

Hope That Someone Really Helps ME :o:D
PS: I Rooted my phone yesterday with the help of a post on XDA Developers forum But That happened also before rooting it... !!!
Note: My S4 I9500 is running Lollipop Android Version 5.0.1

Thank You all!!!.. :fingers-crossed:

samsung Galaxy S4 I9500 is shut off itself + Battery Drains after turning it on!!!

I've been using my S4 I9500 for about 3 weeks. everything's fine but, the phone just shut off itself randomly while using it. After That I can't turn it on again unless I remove the battery then put it again, but unfortunately when I turn it on ... 3 seconds and same thing happen again. When my S4 I9500 shut off itself battery drains super fast, I mean for example before it shut off itself the battery was 60% ,, after I turned it back on it is 12%!!!!!!!:crying:
This also happen sometimes when I launch my camera.. :confused:

Neither the battery nor the phone always feel warm when that happen. I totally have no clue why this happened. anyone here is experiencing the same thing with your s4 I9500? :(:mad:

Hope That Someone Really Helps ME
PS: I Rooted my phone yesterday with the help of a post on XDA Developers forum But That happened also before rooting it... !!! :rolleyes::eek:
Note: My S4 I9500 is running Lollipop Android Version 5.0.1

Thank You all!!!.. :fingers-crossed: