diff --git a/index.md b/index.md
index 591816b..cccb3b2 100644
--- a/index.md
+++ b/index.md
@@ -28,4 +28,6 @@
 
 [audiomass](audiomass/src)
 
+[laptop battery](reads/battery.md)
+
 [survival-manual](survival/Home)
diff --git a/reads/battery.md b/reads/battery.md
new file mode 100644
index 0000000..f7c18c7
--- /dev/null
+++ b/reads/battery.md
@@ -0,0 +1,21 @@
+[Source](https://community.frame.work/t/battery-life/861/12)
+
+For Linux you have much more control if you wanted to control the power envelope yourself. you can use the sysfs interface for the intel-rapl driver to adjust the power limits:
+Eg you can set your PL1 (long term) and PL2 (short term) power limits in uW:
+echo 1 > /sys/class/powercap/intel-rapl:0/enabled
+#PL1
+echo 28000000 > /sys/class/powercap/intel-rapl:0/constraint_0_power_limit_uw
+#PL2
+echo 64000000 > /sys/class/powercap/intel-rapl:0/constraint_1_power_limit_uw
+
+From what I have found there is not a good way for the major window managers to control power profiles that are built into gnome/kde/etc. But it would be interesting to explore more.
+You can read about the interface here, it is pretty cool because you can also use this to monitor power usage too:
+https://www.kernel.org/doc/html/latest/power/powercap/powercap.html
+
+There are a few mentions of intel projects for linux.
+
+https://01.org/linux-thermal-daemon/documentation/introduction-thermal-daemon
+
+https://github.com/intel/dptf
+
+https://01.org/blogs/2014/running-average-power-limit-%E2%80%93-rapl
diff --git a/reads/guides.md b/reads/guides.md
index 3b9ea07..d7921eb 100644
--- a/reads/guides.md
+++ b/reads/guides.md
@@ -70,6 +70,10 @@
 
 [Command Line Interface Guidelines](https://clig.dev/)
 
+[Compression Comparison](https://linuxreviews.org/Comparison_of_Compression_Algorithms)
+
+[Insane Compression Comparison](http://mattmahoney.net/dc/text.html)
+
 ## Qemu
 
 [Drew Devault's Getting Started](https://drewdevault.com/2018/09/10/Getting-started-with-qemu.html)