Battery real life energy vs predicted remaining plotted

echo start > battery.txt; watch -n 60 'date >> battery.txt ; acpi -b >> battery.txt'
This time I added a print to reemaining energy, every minute, time stamped. The example shown here is complete and point to large discrepancies as time passes, converging to accuracy near the end.
Sample Output
# contents of battery.txt . I  removed the AC plug and started the script

start
Seg Out 19 00:00:22 BRST 2009
     Battery 1: charged, 100%
Seg Out 19 00:01:22 BRST 2009
     Battery 1: discharging, 98%, 01:58:22 remaining
Seg Out 19 00:02:22 BRST 2009
     Battery 1: discharging, 97%, 01:34:33 remaining
Seg Out 19 00:03:22 BRST 2009
     Battery 1: discharging, 96%, 01:56:23 remaining
Seg Out 19 00:04:22 BRST 2009
     Battery 1: discharging, 95%, 01:51:19 remaining
Seg Out 19 00:05:22 BRST 2009
     Battery 1: discharging, 94%, 01:48:14 remaining
Seg Out 19 00:06:22 BRST 2009
     Battery 1: discharging, 93%, 01:51:50 remaining
Seg Out 19 00:07:22 BRST 2009
     Battery 1: discharging, 92%, 01:41:49 remaining
Seg Out 19 00:08:22 BRST 2009
     Battery 1: discharging, 91%, 01:43:47 remaining
Seg Out 19 00:09:22 BRST 2009
     Battery 1: discharging, 90%, 01:37:15 remaining
Seg Out 19 00:10:22 BRST 2009
     Battery 1: discharging, 89%, 01:34:37 remaining
Seg Out 19 00:11:22 BRST 2009
     Battery 1: discharging, 88%, 01:39:25 remaining
Seg Out 19 00:12:22 BRST 2009
     Battery 1: discharging, 87%, 01:39:24 remaining
Seg Out 19 00:13:22 BRST 2009
     Battery 1: discharging, 86%, 01:41:27 remaining
Seg Out 19 00:14:22 BRST 2009
     Battery 1: discharging, 86%, 01:38:22 remaining
Seg Out 19 00:15:22 BRST 2009
     Battery 1: discharging, 85%, 01:36:41 remaining
Seg Out 19 00:16:22 BRST 2009
     Battery 1: discharging, 84%, 01:28:19 remaining
Seg Out 19 00:17:22 BRST 2009
     Battery 1: discharging, 83%, 01:34:30 remaining
Seg Out 19 00:18:22 BRST 2009
     Battery 1: discharging, 82%, 01:34:14 remaining
Seg Out 19 00:19:22 BRST 2009
     Battery 1: discharging, 81%, 01:32:49 remaining
Seg Out 19 00:20:22 BRST 2009
     Battery 1: discharging, 80%, 01:32:51 remaining
Seg Out 19 00:21:22 BRST 2009
     Battery 1: discharging, 79%, 01:28:38 remaining
Seg Out 19 00:22:22 BRST 2009
     Battery 1: discharging, 78%, 01:30:43 remaining
Seg Out 19 00:23:22 BRST 2009
     Battery 1: discharging, 77%, 01:29:01 remaining
Seg Out 19 00:24:22 BRST 2009
     Battery 1: discharging, 76%, 01:28:07 remaining
Seg Out 19 00:25:23 BRST 2009
     Battery 1: discharging, 75%, 01:26:47 remaining
Seg Out 19 00:26:23 BRST 2009
     Battery 1: discharging, 74%, 01:21:07 remaining
Seg Out 19 00:27:23 BRST 2009
     Battery 1: discharging, 74%, 01:20:57 remaining
Seg Out 19 00:28:23 BRST 2009
     Battery 1: discharging, 73%, 01:24:13 remaining
Seg Out 19 00:29:23 BRST 2009
     Battery 1: discharging, 72%, 01:22:05 remaining
Seg Out 19 00:30:23 BRST 2009
     Battery 1: discharging, 71%, 01:18:35 remaining
Seg Out 19 00:31:23 BRST 2009
     Battery 1: discharging, 70%, 01:18:10 remaining
Seg Out 19 00:32:23 BRST 2009
     Battery 1: discharging, 69%, 01:20:03 remaining
Seg Out 19 00:33:23 BRST 2009
     Battery 1: discharging, 68%, 01:02:24 remaining
Seg Out 19 00:34:23 BRST 2009
     Battery 1: discharging, 67%, 01:16:06 remaining
Seg Out 19 00:35:23 BRST 2009
     Battery 1: discharging, 66%, 01:15:25 remaining
Seg Out 19 00:36:23 BRST 2009
     Battery 1: discharging, 65%, 01:11:21 remaining
Seg Out 19 00:37:23 BRST 2009
     Battery 1: discharging, 65%, 01:52:59 remaining
Seg Out 19 00:38:23 BRST 2009
     Battery 1: discharging, 64%, 01:51:40 remaining
Seg Out 19 00:39:23 BRST 2009
     Battery 1: discharging, 63%, 01:47:24 remaining
Seg Out 19 00:40:23 BRST 2009
     Battery 1: discharging, 63%, 01:45:28 remaining
Seg Out 19 00:41:23 BRST 2009
     Battery 1: discharging, 62%, 01:49:21 remaining
Seg Out 19 00:42:23 BRST 2009
     Battery 1: discharging, 62%, 01:48:55 remaining
Seg Out 19 00:43:23 BRST 2009
     Battery 1: discharging, 61%, 01:46:37 remaining
Seg Out 19 00:44:23 BRST 2009
     Battery 1: discharging, 60%, 01:43:37 remaining
Seg Out 19 00:45:23 BRST 2009
     Battery 1: discharging, 60%, 01:34:41 remaining
Seg Out 19 00:46:23 BRST 2009
     Battery 1: discharging, 59%, 01:42:59 remaining
Seg Out 19 00:47:23 BRST 2009
     Battery 1: discharging, 59%, 01:34:59 remaining
Seg Out 19 00:48:23 BRST 2009
     Battery 1: discharging, 58%, 01:34:05 remaining
Seg Out 19 00:49:23 BRST 2009
     Battery 1: discharging, 57%, 01:35:02 remaining
Seg Out 19 00:50:23 BRST 2009
     Battery 1: discharging, 57%, 01:38:28 remaining
Seg Out 19 00:51:23 BRST 2009
     Battery 1: discharging, 56%, 01:32:56 remaining
Seg Out 19 00:52:23 BRST 2009
     Battery 1: discharging, 55%, 01:38:18 remaining
Seg Out 19 00:53:23 BRST 2009
     Battery 1: discharging, 55%, 01:35:09 remaining
Seg Out 19 00:54:23 BRST 2009
     Battery 1: discharging, 54%, 01:29:34 remaining
Seg Out 19 00:55:23 BRST 2009
     Battery 1: discharging, 54%, 01:28:44 remaining
Seg Out 19 00:56:23 BRST 2009
     Battery 1: discharging, 53%, 01:25:33 remaining
Seg Out 19 00:57:23 BRST 2009
     Battery 1: discharging, 52%, 01:28:49 remaining
Seg Out 19 00:58:23 BRST 2009
     Battery 1: discharging, 52%, 01:28:03 remaining
Seg Out 19 00:59:23 BRST 2009
     Battery 1: discharging, 51%, 01:26:41 remaining
Seg Out 19 01:00:23 BRST 2009
     Battery 1: discharging, 50%, 01:27:20 remaining
Seg Out 19 01:01:23 BRST 2009
     Battery 1: discharging, 50%, 01:26:16 remaining
Seg Out 19 01:02:23 BRST 2009
     Battery 1: discharging, 49%, 01:25:15 remaining
Seg Out 19 01:03:24 BRST 2009
     Battery 1: discharging, 49%, 01:03:48 remaining
Seg Out 19 01:04:24 BRST 2009
     Battery 1: discharging, 48%, 01:22:12 remaining
Seg Out 19 01:05:24 BRST 2009
     Battery 1: discharging, 47%, 01:21:18 remaining
Seg Out 19 01:06:24 BRST 2009
     Battery 1: discharging, 47%, 01:17:24 remaining
Seg Out 19 01:07:24 BRST 2009
     Battery 1: discharging, 46%, 01:21:53 remaining
Seg Out 19 01:08:24 BRST 2009
     Battery 1: discharging, 45%, 01:18:38 remaining
Seg Out 19 01:09:24 BRST 2009
     Battery 1: discharging, 45%, 01:17:38 remaining
Seg Out 19 01:10:24 BRST 2009
     Battery 1: discharging, 44%, 01:17:43 remaining
Seg Out 19 01:11:24 BRST 2009
     Battery 1: discharging, 44%, 01:16:04 remaining
Seg Out 19 01:12:24 BRST 2009
     Battery 1: discharging, 43%, 01:16:23 remaining
Seg Out 19 01:13:24 BRST 2009
     Battery 1: discharging, 42%, 01:03:56 remaining
Seg Out 19 01:14:24 BRST 2009
     Battery 1: discharging, 42%, 01:03:20 remaining
Seg Out 19 01:15:24 BRST 2009
     Battery 1: discharging, 41%, 01:03:10 remaining
Seg Out 19 01:16:24 BRST 2009
     Battery 1: discharging, 41%, 01:09:42 remaining
Seg Out 19 01:17:24 BRST 2009
     Battery 1: discharging, 40%, 01:05:06 remaining
Seg Out 19 01:18:24 BRST 2009
     Battery 1: discharging, 39%, 01:05:20 remaining
Seg Out 19 01:19:24 BRST 2009
     Battery 1: discharging, 38%, 01:05:57 remaining
Seg Out 19 01:20:24 BRST 2009
     Battery 1: discharging, 38%, 01:03:46 remaining
Seg Out 19 01:21:24 BRST 2009
     Battery 1: discharging, 37%, 01:00:13 remaining
Seg Out 19 01:22:24 BRST 2009
     Battery 1: discharging, 37%, 01:01:40 remaining
Seg Out 19 01:23:24 BRST 2009
     Battery 1: discharging, 36%, 00:59:12 remaining
Seg Out 19 01:24:24 BRST 2009
     Battery 1: discharging, 35%, 01:00:31 remaining
Seg Out 19 01:25:24 BRST 2009
     Battery 1: discharging, 35%, 00:58:29 remaining
Seg Out 19 01:26:24 BRST 2009
     Battery 1: discharging, 34%, 00:57:23 remaining
Seg Out 19 01:27:24 BRST 2009
     Battery 1: discharging, 33%, 00:57:10 remaining
Seg Out 19 01:28:24 BRST 2009
     Battery 1: discharging, 33%, 00:55:25 remaining
Seg Out 19 01:29:24 BRST 2009
     Battery 1: discharging, 32%, 00:55:52 remaining
Seg Out 19 01:30:24 BRST 2009
     Battery 1: discharging, 32%, 00:54:45 remaining
Seg Out 19 01:31:24 BRST 2009
     Battery 1: discharging, 31%, 00:53:34 remaining
Seg Out 19 01:32:24 BRST 2009
     Battery 1: discharging, 30%, 00:53:14 remaining
Seg Out 19 01:33:24 BRST 2009
     Battery 1: discharging, 30%, 00:48:24 remaining
Seg Out 19 01:34:24 BRST 2009
     Battery 1: discharging, 29%, 00:47:46 remaining
Seg Out 19 01:35:24 BRST 2009
     Battery 1: discharging, 28%, 00:49:57 remaining
Seg Out 19 01:36:24 BRST 2009
     Battery 1: discharging, 28%, 00:47:10 remaining
Seg Out 19 01:37:24 BRST 2009
     Battery 1: discharging, 27%, 00:47:04 remaining
Seg Out 19 01:38:24 BRST 2009
     Battery 1: discharging, 26%, 00:44:00 remaining
Seg Out 19 01:39:24 BRST 2009
     Battery 1: discharging, 26%, 00:40:29 remaining
Seg Out 19 01:40:25 BRST 2009
     Battery 1: discharging, 25%, 00:39:58 remaining
Seg Out 19 01:41:25 BRST 2009
     Battery 1: discharging, 24%, 00:38:41 remaining
Seg Out 19 01:42:25 BRST 2009
     Battery 1: discharging, 24%, 00:40:41 remaining
Seg Out 19 01:43:25 BRST 2009
     Battery 1: discharging, 23%, 00:36:22 remaining
Seg Out 19 01:44:25 BRST 2009
     Battery 1: discharging, 22%, 00:38:15 remaining
Seg Out 19 01:45:25 BRST 2009
     Battery 1: discharging, 22%, 00:36:59 remaining
Seg Out 19 01:46:25 BRST 2009
     Battery 1: discharging, 21%, 00:34:42 remaining
Seg Out 19 01:47:25 BRST 2009
     Battery 1: discharging, 20%, 00:38:37 remaining
Seg Out 19 01:48:25 BRST 2009
     Battery 1: discharging, 20%, 00:36:23 remaining
Seg Out 19 01:49:25 BRST 2009
     Battery 1: discharging, 19%, 00:32:27 remaining
Seg Out 19 01:50:25 BRST 2009
     Battery 1: discharging, 19%, 00:33:38 remaining
Seg Out 19 01:51:25 BRST 2009
     Battery 1: discharging, 18%, 00:33:25 remaining
Seg Out 19 01:52:25 BRST 2009
     Battery 1: discharging, 17%, 00:32:01 remaining
Seg Out 19 01:53:25 BRST 2009
     Battery 1: discharging, 17%, 00:22:47 remaining
Seg Out 19 01:54:25 BRST 2009
     Battery 1: discharging, 16%, 00:29:30 remaining
Seg Out 19 01:55:25 BRST 2009
     Battery 1: discharging, 16%, 00:26:29 remaining
Seg Out 19 01:56:25 BRST 2009
     Battery 1: discharging, 15%, 00:28:22 remaining
Seg Out 19 01:57:25 BRST 2009
     Battery 1: discharging, 14%, 00:27:20 remaining
Seg Out 19 01:58:25 BRST 2009
     Battery 1: discharging, 14%, 00:25:20 remaining
Seg Out 19 01:59:25 BRST 2009
     Battery 1: discharging, 13%, 00:23:34 remaining
Seg Out 19 02:00:25 BRST 2009
     Battery 1: discharging, 13%, 00:23:26 remaining
Seg Out 19 02:01:25 BRST 2009
     Battery 1: discharging, 12%, 00:22:14 remaining
Seg Out 19 02:02:25 BRST 2009
     Battery 1: discharging, 11%, 00:19:04 remaining
Seg Out 19 02:03:25 BRST 2009
     Battery 1: discharging, 11%, 00:18:54 remaining
Seg Out 19 02:04:25 BRST 2009
     Battery 1: discharging, 10%, 00:18:21 remaining
Seg Out 19 02:05:25 BRST 2009
     Battery 1: discharging, 9%, 00:17:33 remaining
Seg Out 19 02:06:25 BRST 2009
     Battery 1: discharging, 9%, 00:16:34 remaining
Seg Out 19 02:07:25 BRST 2009
     Battery 1: discharging, 8%, 00:14:15 remaining
Seg Out 19 02:08:25 BRST 2009
     Battery 1: discharging, 8%, 00:14:06 remaining
Seg Out 19 02:09:25 BRST 2009
     Battery 1: discharging, 7%, 00:13:08 remaining
Seg Out 19 02:10:25 BRST 2009
     Battery 1: discharging, 7%, 00:11:48 remaining
Seg Out 19 02:11:25 BRST 2009
     Battery 1: discharging, 7%, 00:11:57 remaining
Seg Out 19 02:12:25 BRST 2009
     Battery 1: discharging, 6%, 00:11:07 remaining
Seg Out 19 02:13:25 BRST 2009
     Battery 1: discharging, 6%, 00:08:01 remaining
Seg Out 19 02:14:25 BRST 2009
     Battery 1: discharging, 5%, 00:09:45 remaining
Seg Out 19 02:15:25 BRST 2009
     Battery 1: discharging, 4%, 00:08:12 remaining
Seg Out 19 02:16:25 BRST 2009
     Battery 1: discharging, 4%, 00:06:40 remaining
Seg Out 19 02:17:25 BRST 2009
     Battery 1: discharging, 3%, 00:06:09 remaining
Seg Out 19 02:18:26 BRST 2009
     Battery 1: discharging, 3%, 00:04:58 remaining
Seg Out 19 02:19:26 BRST 2009
     Battery 1: discharging, 3%, 00:04:58 remaining
Seg Out 19 02:20:26 BRST 2009
     Battery 1: discharging, 3%, 00:04:57 remaining
Seg Out 19 02:21:26 BRST 2009
     Battery 1: discharging, 3%, 00:03:27 remaining
Seg Out 19 02:22:26 BRST 2009
     Battery 1: discharging, 3%, 00:03:36 remaining
Seg Out 19 02:23:26 BRST 2009
     Battery 1: discharging, 2%, 00:03:22 remaining
Seg Out 19 02:24:26 BRST 2009
     Battery 1: discharging, 2%, 00:02:21 remaining
Seg Out 19 02:25:26 BRST 2009
     Battery 1: discharging, 1%, 00:01:24 remaining

# time of death shows 02:25, wich means 26 min more than initially predicted... Now I know my battery lasts 2 hours and 25 minutes...

1
By: m33600
2009-10-19 05:28:15

These Might Interest You

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    -1
    while cat energy_now; do sleep 1; done |awk -v F=$(cat energy_full) -v C=60 'NR==1{P=B=$1;p=100/F} {d=$1-P; if(d!=0&&d*D<=0){D=d;n=1;A[0]=B=P}; if(n>0){r=g=($1-B)/n;if(n>C){r=($1-A[n%C])/C}}; A[n++%C]=P=$1; printf "%3d %+09.5f %+09.5f\n", p*$1, p*g, p*r}'
    sqweek · 2015-09-19 15:45:40 0
  • Fully recharge your computer battery and start this script. It will create or clean the file named battery.txt, print a start on it and every minute it will append a time stamp to it. Batteries last few hours, and each hour will have 60 lines of time stamping. Really good for assuring the system was tested in real life with no surprises. The last time stamp inside the battery.txt file is of interest. It is the time the computer went off, as the battery was dead! Turn on your computer after that, on AC power of course, and open battery.txt. Read the first and last time stamps and now you really know if you can trust your computer sensors. If you want a simple line of text inside the battery.txt file, use this: watch -n 60 'date > battery.txt' The time of death will be printed inside Show Sample Output


    0
    echo start > battery.txt; watch -n 60 'date >> battery.txt'
    m33600 · 2009-10-18 07:00:26 0
  • Remaining battery time is displayed in minutes Show Sample Output


    0
    pmset -g batt | awk '/^ /{print $5}'
    zlemini · 2017-04-21 20:46:00 1
  • Convenient to leave running in a yakuake or plasmacon terminal. For older kernels watch -n 5 cat /proc/acpi/battery/BAT0/state Show Sample Output


    0
    watch -n 5 "upower -d | grep energy -A 4"
    aidanlinz · 2012-04-02 22:33:37 0

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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