Battery huge

With Lithium-ion battery I get the values listed here below during
discharge.

Any suggest in how to compute this curve to supply a reasonable-good battery
level percentage? (i.e. I want that 60% of charge means an estimated
remaining duration time of 60%)

Also the data below are obtained testing a new battery: have I to consider
tests after 10-100-1000 discharge cycles, in other words have I to consider
the average of discharge curves tested in different conditions in your
opinion?

T.I.A.,

Massimo


1023,5 (full charge)
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1023,5
1022,5
1021,5
1022,5
1022,5
1022,5
1019,5
1019,5
1020,5
1021,5
1019,5
1018,5
1019,5
1018,5
1019,5
1017,5
1016,5
1017,5
1016,5
1015,5
1015,5
1015,5
1015,5
1014,5
1014,5
1014,5
1014,5
1013,5
1011,5
1011,5
1012,5
1011,5
1011,5
1012,5
1011,5
1011,5
1010,5
1010,5
1011,5
1009,5
1009,5
1009,5
1009,5
1008,5
1007,5
1007,5
1007,5
1006,5
1006,5
1007,5
1006,5
1006,5
1005,5
1005,5
1005,5
1005,5
1003,5
1004,5
1004,5
1002,5
1002,5
1002,5
1002,5
1002,5
1002,5
1001,5
1002,5
1001,5
999,5
1001,5
999,5
999,5
999,5
999,5
998,5
999,5
998,5
998,5
997,5
997,5
997,5
996,5
996,5
996,5
996,5
996,5
994,5
994,5
994,5
994,5
994,5
993,5
993,5
993,5
992,5
993,5
993,5
991,5
991,5
991,5
990,5
991,5
990,5
988,5
990,5
989,5
988,5
987,5
986,5
987,5
986,5
986,5
986,5
984,5
985,5
984,5
984,5
983,5
983,5
983,5
982,5
982,5
982,5
981,5
981,5
980,5
981,5
980,5
980,5
978,5
979,5
980,5
979,5
977,5
978,5
978,5
978,5
977,5
978,5
976,5
977,5
976,5
976,5
976,5
975,5
976,5
976,5
974,5
976,5
974,5
977,5
974,5
975,5
975,5
973,5
974,5
974,5
973,5
974,5
972,5
974,5
975,5
973,5
974,5
972,5
973,5
972,5
972,5
972,5
972,5
972,5
971,5
972,5
972,5
971,5
973,5
971,5
971,5
971,5
971,5
971,5
973,5
972,5
970,5
971,5
970,5
971,5
970,5
970,5
971,5
971,5
971,5
971,5
970,5
970,5
970,5
970,5
970,5
970,5
971,5
969,5
970,5
970,5
971,5
969,5
969,5
970,5
971,5
970,5
969,5
970,5
970,5
970,5
969,5
970,5
970,5
970,5
968,5
969,5
971,5
969,5
969,5
970,5
970,5
969,5
969,5
968,5
969,5
970,5
968,5
968,5
969,5
969,5
969,5
968,5
969,5
968,5
968,5
969,5
969,5
968,5
968,5
969,5
969,5
967,5
968,5
969,5
968,5
969,5
968,5
969,5
969,5
967,5
968,5
968,5
969,5
968,5
968,5
968,5
967,5
967,5
968,5
968,5
966,5
967,5
967,5
967,5
967,5
966,5
966,5
966,5
966,5
966,5
966,5
966,5
966,5
965,5
966,5
966,5
966,5
966,5
965,5
965,5
965,5
964,5
964,5
964,5
965,5
963,5
963,5
963,5
964,5
963,5
962,5
961,5
961,5
961,5
961,5
961,5
962,5
961,5
960,5
960,5
960,5
959,5
959,5
960,5
958,5
959,5
958,5
958,5
958,5
957,5
956,5
955,5
955,5
955,5
954,5
955,5
954,5
952,5
952,5
951,5
952,5
949,5
949,5
948,5
947,5
947,5
946,5
946,5
945,5
945,5
943,5
944,5
942,5
941,5
941,5
940,5
941,5
939,5
939,5
939,5
937,5
938,5
938,5
936,5
936,5
936,5
936,5
935,5
935,5
933,5
933,5
933,5
933,5
931,5
931,5
930,5
928,5
929,5
928,5
928,5
927,5
926,5
925,5
924,5
921,5
922,5
922,5
921,5
920,5
919,5
918,5
917,5
915,5
916,5
913,5
913,5
912,5
910,5
909,5
906,5
906,5
903,5
901,5
898,5
895,5
891,5
889,5
885,5
881,5
877,5
873,5
869,5
863,5
858,5
853,5
845,5
839,5
830,5
821,5
810,5
797,5
797,5
796,5 (cut-off)


0
QuantumUniverses
1/12/2010 2:17:13 PM
windowsce.platbuilder 744 articles. 0 followers. Follow

8 Replies
884 Views

Similar Articles

[PageSpeed] 26

You have already identified some of the problems with your plan, but let me 
throw in a few more; CPU load, power managemnet (turning on and off 
hardware) and temperature.

You may need to look at recent charge history to determine time remaining.

-- 
Bruce Eitman (eMVP)
Senior Engineer
Bruce.Eitman AT Eurotech DOT com
My BLOG http://geekswithblogs.net/bruceeitman

Eurotech Inc.
www.Eurotech.com

"QuantumUniverses" <quantumuniverses@gmail.com> wrote in message 
news:uMgaRH5kKHA.5520@TK2MSFTNGP06.phx.gbl...
> With Lithium-ion battery I get the values listed here below during
> discharge.
>
> Any suggest in how to compute this curve to supply a reasonable-good 
> battery
> level percentage? (i.e. I want that 60% of charge means an estimated
> remaining duration time of 60%)
>
> Also the data below are obtained testing a new battery: have I to consider
> tests after 10-100-1000 discharge cycles, in other words have I to 
> consider
> the average of discharge curves tested in different conditions in your
> opinion?
>
> T.I.A.,
>
> Massimo
>
>
> 1023,5 (full charge)
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1023,5
> 1022,5
> 1021,5
> 1022,5
> 1022,5
> 1022,5
> 1019,5
> 1019,5
> 1020,5
> 1021,5
> 1019,5
> 1018,5
> 1019,5
> 1018,5
> 1019,5
> 1017,5
> 1016,5
> 1017,5
> 1016,5
> 1015,5
> 1015,5
> 1015,5
> 1015,5
> 1014,5
> 1014,5
> 1014,5
> 1014,5
> 1013,5
> 1011,5
> 1011,5
> 1012,5
> 1011,5
> 1011,5
> 1012,5
> 1011,5
> 1011,5
> 1010,5
> 1010,5
> 1011,5
> 1009,5
> 1009,5
> 1009,5
> 1009,5
> 1008,5
> 1007,5
> 1007,5
> 1007,5
> 1006,5
> 1006,5
> 1007,5
> 1006,5
> 1006,5
> 1005,5
> 1005,5
> 1005,5
> 1005,5
> 1003,5
> 1004,5
> 1004,5
> 1002,5
> 1002,5
> 1002,5
> 1002,5
> 1002,5
> 1002,5
> 1001,5
> 1002,5
> 1001,5
> 999,5
> 1001,5
> 999,5
> 999,5
> 999,5
> 999,5
> 998,5
> 999,5
> 998,5
> 998,5
> 997,5
> 997,5
> 997,5
> 996,5
> 996,5
> 996,5
> 996,5
> 996,5
> 994,5
> 994,5
> 994,5
> 994,5
> 994,5
> 993,5
> 993,5
> 993,5
> 992,5
> 993,5
> 993,5
> 991,5
> 991,5
> 991,5
> 990,5
> 991,5
> 990,5
> 988,5
> 990,5
> 989,5
> 988,5
> 987,5
> 986,5
> 987,5
> 986,5
> 986,5
> 986,5
> 984,5
> 985,5
> 984,5
> 984,5
> 983,5
> 983,5
> 983,5
> 982,5
> 982,5
> 982,5
> 981,5
> 981,5
> 980,5
> 981,5
> 980,5
> 980,5
> 978,5
> 979,5
> 980,5
> 979,5
> 977,5
> 978,5
> 978,5
> 978,5
> 977,5
> 978,5
> 976,5
> 977,5
> 976,5
> 976,5
> 976,5
> 975,5
> 976,5
> 976,5
> 974,5
> 976,5
> 974,5
> 977,5
> 974,5
> 975,5
> 975,5
> 973,5
> 974,5
> 974,5
> 973,5
> 974,5
> 972,5
> 974,5
> 975,5
> 973,5
> 974,5
> 972,5
> 973,5
> 972,5
> 972,5
> 972,5
> 972,5
> 972,5
> 971,5
> 972,5
> 972,5
> 971,5
> 973,5
> 971,5
> 971,5
> 971,5
> 971,5
> 971,5
> 973,5
> 972,5
> 970,5
> 971,5
> 970,5
> 971,5
> 970,5
> 970,5
> 971,5
> 971,5
> 971,5
> 971,5
> 970,5
> 970,5
> 970,5
> 970,5
> 970,5
> 970,5
> 971,5
> 969,5
> 970,5
> 970,5
> 971,5
> 969,5
> 969,5
> 970,5
> 971,5
> 970,5
> 969,5
> 970,5
> 970,5
> 970,5
> 969,5
> 970,5
> 970,5
> 970,5
> 968,5
> 969,5
> 971,5
> 969,5
> 969,5
> 970,5
> 970,5
> 969,5
> 969,5
> 968,5
> 969,5
> 970,5
> 968,5
> 968,5
> 969,5
> 969,5
> 969,5
> 968,5
> 969,5
> 968,5
> 968,5
> 969,5
> 969,5
> 968,5
> 968,5
> 969,5
> 969,5
> 967,5
> 968,5
> 969,5
> 968,5
> 969,5
> 968,5
> 969,5
> 969,5
> 967,5
> 968,5
> 968,5
> 969,5
> 968,5
> 968,5
> 968,5
> 967,5
> 967,5
> 968,5
> 968,5
> 966,5
> 967,5
> 967,5
> 967,5
> 967,5
> 966,5
> 966,5
> 966,5
> 966,5
> 966,5
> 966,5
> 966,5
> 966,5
> 965,5
> 966,5
> 966,5
> 966,5
> 966,5
> 965,5
> 965,5
> 965,5
> 964,5
> 964,5
> 964,5
> 965,5
> 963,5
> 963,5
> 963,5
> 964,5
> 963,5
> 962,5
> 961,5
> 961,5
> 961,5
> 961,5
> 961,5
> 962,5
> 961,5
> 960,5
> 960,5
> 960,5
> 959,5
> 959,5
> 960,5
> 958,5
> 959,5
> 958,5
> 958,5
> 958,5
> 957,5
> 956,5
> 955,5
> 955,5
> 955,5
> 954,5
> 955,5
> 954,5
> 952,5
> 952,5
> 951,5
> 952,5
> 949,5
> 949,5
> 948,5
> 947,5
> 947,5
> 946,5
> 946,5
> 945,5
> 945,5
> 943,5
> 944,5
> 942,5
> 941,5
> 941,5
> 940,5
> 941,5
> 939,5
> 939,5
> 939,5
> 937,5
> 938,5
> 938,5
> 936,5
> 936,5
> 936,5
> 936,5
> 935,5
> 935,5
> 933,5
> 933,5
> 933,5
> 933,5
> 931,5
> 931,5
> 930,5
> 928,5
> 929,5
> 928,5
> 928,5
> 927,5
> 926,5
> 925,5
> 924,5
> 921,5
> 922,5
> 922,5
> 921,5
> 920,5
> 919,5
> 918,5
> 917,5
> 915,5
> 916,5
> 913,5
> 913,5
> 912,5
> 910,5
> 909,5
> 906,5
> 906,5
> 903,5
> 901,5
> 898,5
> 895,5
> 891,5
> 889,5
> 885,5
> 881,5
> 877,5
> 873,5
> 869,5
> 863,5
> 858,5
> 853,5
> 845,5
> 839,5
> 830,5
> 821,5
> 810,5
> 797,5
> 797,5
> 796,5 (cut-off)
>
> 


0
Bruce
1/12/2010 2:57:57 PM
> You have already identified some of the problems with your plan, but let
me
> throw in a few more; CPU load, power managemnet (turning on and off
> hardware) and temperature.

Do you mean I should consider the discharge curve in many conditions? I
don't think it could help in understanding the curve, but only how long the
discharge takes. I mean that if I only need to assign battery level % to
battery value I only need to determine the discharge curve, not the
discharge in various conditions, since (I suppose) it should be the same
curve even if scaled (in a longer or shorter time). In other words, I think
all the curves got from discharge should have the same behaviour even if
more or less compressed according to battery consumption..

> You may need to look at recent charge history to determine time remaining.

What do you mean exactly?

Massimo


0
QuantumUniverses
1/12/2010 3:26:51 PM
On Jan 12, 3:26=A0pm, "QuantumUniverses" <quantumuniver...@gmail.com>
wrote:
> > You have already identified some of the problems with your plan, but le=
t
> me
> > throw in a few more; CPU load, power managemnet (turning on and off
> > hardware) and temperature.
>
> Do you mean I should consider the discharge curve in many conditions? I
> don't think it could help in understanding the curve, but only how long t=
he
> discharge takes. I mean that if I only need to assign battery level % to
> battery value I only need to determine the discharge curve, not the
> discharge in various conditions, since (I suppose) it should be the same
> curve even if scaled (in a longer or shorter time). In other words, I thi=
nk
> all the curves got from discharge should have the same behaviour even if
> more or less compressed according to battery consumption..
>
> > You may need to look at recent charge history to determine time remaini=
ng.
>
> What do you mean exactly?
>
> Massimo

The only really reliable way to do this it to use a "coulomb counter"
chip as part of the battery circuit (such as http://focus.ti.com/lit/ds/sym=
link/bq26231.pdf).
If you can, I would suggest incorporating one into your device.
Andrew.
0
AndrewScholan
1/12/2010 3:55:58 PM
Even in that situation, to get a percentage remaining that indicates 
remaining *time*, you have to look at the instantaneous consumption rate 
averaged over some short time that the device is currently seeing and figure 
out how much charge is left at the current consumption rate.  If the 
processor has a low-power mode that it drops into when idle, the percentage 
will jump all over the place.

I'd advise that you forget about returning a percentage that indicates 
*time* remaining and simply return the percentage of *energy* remaining in 
the battery.  A columb counter will give you this information quite easily.  
From that point, let the application guy working with your device decide how 
critical his energy level is, based on the amount of energy left.

Paul T.

"AndrewScholan[MCTS]" wrote:

> On Jan 12, 3:26 pm, "QuantumUniverses" <quantumuniver...@gmail.com>
> wrote:
> > > You have already identified some of the problems with your plan, but let
> > me
> > > throw in a few more; CPU load, power managemnet (turning on and off
> > > hardware) and temperature.
> >
> > Do you mean I should consider the discharge curve in many conditions? I
> > don't think it could help in understanding the curve, but only how long the
> > discharge takes. I mean that if I only need to assign battery level % to
> > battery value I only need to determine the discharge curve, not the
> > discharge in various conditions, since (I suppose) it should be the same
> > curve even if scaled (in a longer or shorter time). In other words, I think
> > all the curves got from discharge should have the same behaviour even if
> > more or less compressed according to battery consumption..
> >
> > > You may need to look at recent charge history to determine time remaining.
> >
> > What do you mean exactly?
> >
> > Massimo
> 
> The only really reliable way to do this it to use a "coulomb counter"
> chip as part of the battery circuit (such as http://focus.ti.com/lit/ds/symlink/bq26231.pdf).
> If you can, I would suggest incorporating one into your device.
> Andrew.
> .
> 
0
Utf
1/12/2010 7:32:01 PM
> The only really reliable way to do this it to use a "coulomb counter"
> chip as part of the battery circuit (such as
http://focus.ti.com/lit/ds/symlink/bq26231.pdf).

Interesting..

Massimo


0
QuantumUniverses
1/13/2010 11:19:28 AM
> Even in that situation, to get a percentage remaining that indicates
> remaining *time*, you have to look at the instantaneous consumption rate
> averaged over some short time that the device is currently seeing and
figure
> out how much charge is left at the current consumption rate.  If the

You're right. But your words forced to choose remaining battery level
instead of time, because it's simpler, and because (for what I saw) it's the
choice adopted by many devices (Windows CE inside, too). In this way I
haven't to consider instantaneous consumption rate avg.. but only to supply
a level depending on the discharge curve I'm getting with my tests.

Do you agree with me? :)

Massimo


0
QuantumUniverses
1/13/2010 11:23:19 AM
Yes, it's easier to show remaining charge as a percentage of total charge 
carried by the battery when fully charged.  In that case, you don't have to 
know at exactly what rate charge is being consumed, only how much the battery 
holds and how much has been consumed total since the last full charge.  Is 
that what you're asking?

Paul T.

"QuantumUniverses" wrote:

> > Even in that situation, to get a percentage remaining that indicates
> > remaining *time*, you have to look at the instantaneous consumption rate
> > averaged over some short time that the device is currently seeing and
> figure
> > out how much charge is left at the current consumption rate.  If the
> 
> You're right. But your words forced to choose remaining battery level
> instead of time, because it's simpler, and because (for what I saw) it's the
> choice adopted by many devices (Windows CE inside, too). In this way I
> haven't to consider instantaneous consumption rate avg.. but only to supply
> a level depending on the discharge curve I'm getting with my tests.
> 
> Do you agree with me? :)
> 
> Massimo
> 
> 
> .
> 
0
Utf
1/13/2010 7:13:02 PM
> holds and how much has been consumed total since the last full charge.  Is
> that what you're asking?

Yes! :)

Thanks a lot,

Massimo


0
QuantumUniverses
1/14/2010 8:04:42 AM
Reply:

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