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Old 06-13-2024, 03:35 AM   #1366
Aleron Ives
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As far as I can tell, Kobo's battery meter has significant drift based on your charging habits. If you try to follow the guidance of keeping the battery between 25 - 75%, the meter starts to think that 75% charged is 100% charged, because it never goes above that point. I now have a > 20% disparity between what the battery icon reports and what the voltage indicates about the charge level. I'll try doing a full charge next time to see if I can get them to line up again.
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Old 06-13-2024, 01:55 PM   #1367
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Quote:
Originally Posted by DNSB View Post
Just curious as to whether anyone has modified the battcalc.sh script for other Kobo ereaders? As far as I can tell, the Clara HD and Sage only supply two of the values so not that informative.
I've been playing around with it off and on on the Clara HD, and it looks like the values that it has are:

-rw-r--r-- 1 root root 4096 Jun 7 09:47 uevent
-r--r--r-- 1 root root 4096 Jun 7 09:48 status
-r--r--r-- 1 root root 4096 Jun 7 09:48 time_to_full_now
-r--r--r-- 1 root root 4096 Jun 7 09:48 capacity
-r--r--r-- 1 root root 4096 Jun 7 09:48 voltage_now
-rw-r--r-- 1 root root 4096 Jun 7 09:48 voltage_min_design
-r--r--r-- 1 root root 4096 Jun 7 09:48 type
-r--r--r-- 1 root root 4096 Jun 7 09:48 time_to_empty_now
-r--r--r-- 1 root root 4096 Jun 7 09:48 temp
-r--r--r-- 1 root root 4096 Jun 7 09:48 technology
-r--r--r-- 1 root root 4096 Jun 7 09:48 present
drwxr-xr-x 2 root root 0 Jun 7 09:48 power
-r--r--r-- 1 root root 4096 Jun 7 09:48 health
-r--r--r-- 1 root root 4096 Jun 7 09:48 current_now

Unfortunately, no voltage_max or charge_full.
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Old 06-14-2024, 06:05 PM   #1368
jillmess
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Quote:
Originally Posted by Aleron Ives View Post
I made an update for my battery statistics calculation script.
I have obviously missed doing something basic in trying to set this up on my libra 2. What am I doing wrong?
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Old 06-14-2024, 06:24 PM   #1369
Aleron Ives
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My guess would be that you copied the script into a text editor that uses Windows line endings (CRLF), instead of Linux line endings (LF). You need to use a different text editor, such as Notepad++, to convert the script to Linux line endings. I use MadEdit for such purposes, myself.
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Old 06-14-2024, 08:54 PM   #1370
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Quote:
Originally Posted by Aleron Ives View Post
My guess would be that you copied the script into a text editor that uses Windows line endings (CRLF), instead of Linux line endings (LF). You need to use a different text editor, such as Notepad++, to convert the script to Linux line endings. I use MadEdit for such purposes, myself.
I did use notepad++ but will check the line endings. Thanks.

Edit: Telnet to my libra 2 shows the file structure to be similar to the Clara HD listed a couple of posts above.

Last edited by jillmess; Yesterday at 04:14 AM.
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Old Today, 06:41 PM   #1371
mergen3107
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Here is what is available for Kobo Clara HD in battcalc.sh:

Code:
# Battery Statistics Calculator 1.1 (2024-05-25) by Aleron Ives
# Modified for Kobo Clara HD by mergen3107
# This script calculates battery statistics for the Kobo Libra 2.
# Check the contents of /sys/class/power_supply/ if you use a different
# model to ensure that the statistics you want to track are available.
#
# You can use NickelMenu to invoke this script like so:
# menu_item :main :Battery :cmd_output :500 :/mnt/onboard/.adds/battcalc.sh

# Gather the necessary statistics
meter=$(cat /sys/class/power_supply/mc13892_bat/capacity)
v_now=$(cat /sys/class/power_supply/mc13892_bat/voltage_now)
health=$(cat /sys/class/power_supply/mc13892_bat/health)
temp=$(cat /sys/class/power_supply/mc13892_bat/temp)

# Format the statistics
let v_now/=1000;
let temp/=10;

echo Capacity: $meter %
echo Voltage: $v_now mV
echo Health: $health
echo Temperature: $temp °C
"Health" is only a word ("Good" in my case).

Thanks everyone for NickelMenu and this script!
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Old Today, 07:25 PM   #1372
Aleron Ives
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What does the voltage claim to be if you charge to 100% and then use the Clara for a little while? You'll probably see a nonsensical value like 4.8 V at first, but once it drops, you may be able to estimate what v_max is in order to do the voltage calculations.
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