Help Battery drains quickly under 40%

[Alonzzo2]

My battery is alright, and can last almost 2 days, but while from 100% to ~40% it drains 'normally' , from 40% to 0% it drains real fast - about 20 minutes phone call.

anyone else share the same problem?

 

[sado1]

Yeah, think that's nothing unusual. It goes another way too - like 10 minutes from 0% to 50% when charging then 2 hours to 100% for me. Just live with it. Using Galaxo [II5] - so have a question to IK4 users: did they improve it in that firmware?

 

[KlaymenDK]

The battery provides Android with a voltage monitor which can only be used to estimate the remaining capacity. To give an accurate indication, you'd need to monitor the amperage, and neither the battery/phone nor the Android OS have any provisions for that. So what you're seeing is an estimate, and cannot be assumed to be a linear 100-0 scale.

Have you run the battery down entirely, then recharged it fully? The purpose of this is not to condition the battery (the new types don't need it), but to calibrate the scale. Try it a couple of times (yeah sorry, should take most of a week) and see if your problem lessens or goes away.

 

[KlaymenDK]

@sado: I have K4 --love it, relatively speaking--but can't really say about this item in particular. I tend to just suddenly realise that my plastic brain has flatlined while I was looking the other way, far away from a power plug.

 

[qwerty100]

See my other post on this here...

http://androidforums.com/samsung-i7...oid-support-what-would-needed.html#post184602

Basically bewteen releases II5 and IK1, the following mappings were changed.
The First column is the ADC reading (AnaloguetoDigitalConverter) representing the REAL reading of battery power remaining.

The 2nd Column shows how for a specific ADC reading, how the pre II5 firmware scaled/mapped this to a percentage.

The 3rd Column shows the values used for releases II5 and IK1 and possibly beyond

Note that after II5 the effective battery power percentage reading will drop much quicker than before (for percentages 100 to 51, the mapping tabe is unchanged)

The other thing is that this does NOT change the battery life, only the effective percentage value reported back to the apps, (and therefore your impression of the battery drain)


ADC PreII5% II5%
1030 50 50
1024 49 48
1018 48 46
1012 47 44
1006 46 42
1000 45 40
994 44 38
988 43 36
982 42 34
976 41 32
970 40 30
964 39 29
958 38 28
952 37 26
946 36 25
940 35 23
934 34 22
928 33 20
922 32 19
916 31 17
910 30 16
904 29 15
898 28 14
892 27 13
886 26 12
880 25 11
874 24 10
868 23 9
862 22 8
856 21 7
850 20 6
844 19 5
839 18 5
834 17 5
828 16 5
823 15 4
818 14 4
812 13 4
807 12 4
802 11 3
796 10 3
791 9 3
786 8 3
780 7 2
775 6 2
770 5 2
724 4 2
678 3 1
632 2 1
586 1 1
540 0 0
0 0 0

 

[KlaymenDK]

Nice reference, qwerty!

I'm a visual kinda guy, so I made this.

Edit: Correct header: "pre-i5 vs i5&later" (oops)

 

[mrqs]

I'm a visual kinda guy, so I made this.

you might wanna change the header on that - it's not a i5 vs k4, but pre-i5 vs i5 & k4 (+future releases?)