diff --git a/config_files/.zshrc b/config_files/.zshrc
index 4f0b6d5..2cd3d1c 100644
--- a/config_files/.zshrc
+++ b/config_files/.zshrc
@@ -211,6 +211,7 @@ export EDITOR="code --wait"
 
 # for openJDK
 #export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64
-export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
+#export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
+export JAVA_HOME=/usr/lib/jvm/java-21-openjdk-amd64
 export PATH=$JAVA_HOME/bin:$PATH
 
diff --git a/tutos/computer.txt b/tutos/computer.txt
index 6fe11fa..17c796c 100644
--- a/tutos/computer.txt
+++ b/tutos/computer.txt
@@ -269,6 +269,24 @@ find | sort | grep -ve "node_modules/" -e ".git/" | sed 's#[^/]*/#|__ #g;s#__ |#
 	**sudo mkfs -t vfat -n "<name>" /dev/sdb1** to format in fat32 (vfat) (MaKe FileSystem)
 
 
+**control battery life : use "tlp"**
+	- **sudo apt install tlp tlp-rdw**
+	- to see the status : **sudo tlp-stat -b**
+		- look at these lines :
+		- **Parameter value range:**
+		- *** STOP_CHARGE_THRESH_BAT0/1: 0(off)..100(default)**
+		- it means the computer only supports stop parameter
+	- **sudo vim /etc/tlp.conf**
+		- START_CHARGE_THRESH_BAT0=0
+		- STOP_CHARGE_THRESH_BAT0=80
+	- maybe : **sudo systemctl enable tlp.service**
+	- then : **sudo tlp start**
+	- you can check the parameters again : **sudo tlp-stat -b**
+
+**battery level script lookup :**
+	- **~/.config/battery_level/battery_state_log.sh**
+
+
 **list of automatic settings :**
 	- install screen, omyzsh, keepassxc, curl, make, firefox, signal, gnome-tweaks, ffmpeg, yt-dlp, element
 	- install or configure to avoid screen blue light
diff --git a/tutos/server.md b/tutos/server.md
index a7584a7..57b0b0b 100644
--- a/tutos/server.md
+++ b/tutos/server.md
@@ -131,6 +131,7 @@ gateway : fe80::226:bff:feef:59ff
 - OPTION 1/3 : open this file with java with python script :
 	- the script can be found here : **https://gist.github.com/TheJJ/2394cd76d3e2c34d02e3da1bd3e489b2?ref=blockdev.io**
 	- I added it to this config folder
+	- i also added it to the PATH **~/.local/bin/idracclient.py** so you can call it from anywhere like that : **idracclient.py <ip> -u <username>**
 - OPTION 2/3 : open this file with global java yourself (last time it didn't worked) :
 	- install java 8 (it might works better with idrac6) : **sudo apt-get install openjdk-8-jre**
 	- for other versions : **https://openjdk.org/install/**