How to healthy your Laptop Battery

Gloster — Mon, 15 Jun 2026 05:19:39 GMT

Mark Pearson (Lenovo) : "For battery charging thresholds I recently dug into that a bit and got the following guidance from the battery team:
� If you often discharge your battery to near eempty (< 20%) then start charging at 95% and stop at 100%
� If you frequently use the battery but don't fully discharge. Usage between 50% and 100% then start charging at 75% and stop at 80%
� If you always use an AC adapter and rarely use battery start charging at 45% and stop at 50%" (refer to https://pointieststick.com/2020/06/08/lenovo-thinkpad-x1-yoga-impressions-bugs-workaro...ut-the-future/)

I use the third case, but a presupposition will be by Mark Pearson, that 2 thresholds will be used to start charging at 45% and stop at 50%.
My system a Vivibook only does support one threshold :
# Charging stops when the battery level reaches or exceeds this threshold.
STOP_CHARGE_THRESH_BAT0=50

and not :

# Charging starts once the battery level is below this threshold.
START_CHARGE_THRESH_BAT0=45

Also it must be known, if the battery is not in use (AC adapter always plugged), the battery itself will be discharged by "Self-discharging"
(refer to https://www.el-cell.com/what-is-the-self-discharge-rate-of-a-lithium-ion-battery/).

Furthermore I did install tlp Vers. 1.9 to get /etc/tlp.conf where all values can be set by predefined Constants (e.g.: STOP_CHARGE_THRESH_BAT0).

sudo add-apt-repository ppa:linrunner/tlp
sudo apt update
sudo apt install tlp tlp-pd tlp-rdw

I wrote a script to simulate the upper and lower threshold /home/richard/.local/bin/Toggle_45_50MaxLoad.sh :

#!/bin/bash

declare -i SetLowThresHold=1

# Konfiguration
#LogFile="/home/richard/battery_log.txt"
BatteryDir="/sys/class/power_supply/BAT0"

# get values
Capacity=$(cat ${BatteryDir}/capacity)
#Status=$(cat ${BatteryDir}/status)
#Time=$(date "+%Y-%m-%d %H:%M:%S")

echo $Capacity
#echo $Status
#echo $Time

if [ "$Capacity" -le 45 ]
then
SetLowThresHold=0
fi

while true; do

if [ "$SetLowThresHold" -eq 1 ]
then
#set lower threshold
sudo sed -ie 's/^#*STOP_CHARGE_THRESH_BAT0=.*/STOP_CHARGE_THRESH_BAT0=44/' /etc/tlp.conf
#new value will be read
sudo tlp start
while [ "$SetLowThresHold" -eq 1 ]; do
#write to log
Capacity=$(cat ${BatteryDir}/capacity)
#Status=$(cat ${BatteryDir}/status)
#Time=$(date "+%Y-%m-%d %H:%M:%S")
#echo "${Time} - Battery Level: ${Capacity}% - Status: ${Status}" >> ${LogFile}
#echo $Capacity
if [ "$Capacity" -le 45 ]
then
SetLowThresHold=0
fi
sleep 20
done
#echo $SetLowThresHold
else
#set higher threshold
sudo sed -ie 's/^#*STOP_CHARGE_THRESH_BAT0=.*/STOP_CHARGE_THRESH_BAT0=51/' /etc/tlp.conf
#new value will be read
sudo tlp start
while [ "$SetLowThresHold" -eq 0 ]; do
#write to log
Capacity=$(cat ${BatteryDir}/capacity)
#Status=$(cat ${BatteryDir}/status)
#Time=$(date "+%Y-%m-%d %H:%M:%S")
#echo "${Time} - Battery Level: ${Capacity}% - Status: ${Status}" >> ${LogFile}
#echo $Capacity
if [ "$Capacity" -ge 50 ]
then
SetLowThresHold=1
fi
sleep 20
done
#echo $SetLowThresHold
fi
done

It must be installed as service with root rights Accu_Threshold_45_50.service in /etc/systemd/system :

[Unit]
Description=Toggle 45% to 50% For Accu
After=network.target

[Service]
ExecStart=/bin/bash /home/richard/.local/bin/Toggle_45_50MaxLoad.sh
Restart=always
User=root

[Install]
WantedBy=multi-user.target

After all the service must be started, checked and can be stopped if 100% capacity will be whished :

systemctl enable Accu_Threshold_45_50
systemctl is-enabled Accu_Threshold_45_50
systemctl disable Accu_Threshold_45_50
systemctl is-enabled Accu_Threshold_45_50

The script itself does only every 20sec a question, therefore no CPU load.

Since two years only I did use one threshold, max battery charge level 80%, I got the information by tlp Batterie analysis :
sudo tlp-stat -b

/sys/class/power_supply/BAT0/status = Not charging

/sys/class/power_supply/BAT0/charge_control_end_threshold = 44 [%]

Charge = 49.7 [%]
Capacity = 76.3 [%]

It is for linux systems, but if you have in mind, a Linux system does use only 40GB, 70GB would be enough to work with it. I am a Dual boot user, you will get also a complete Office system like 365.

VideoHelp Forum - Computer

How to healthy your Laptop Battery