Index: manual/advanced_topics/main.tex
===================================================================
--- manual/advanced_topics/main.tex	(revision 25371)
+++ manual/advanced_topics/main.tex	(working copy)
@@ -580,3 +580,51 @@
 
 \opt{archos}{\input{advanced_topics/archos-flashing.tex}}
 
+\section{\label{ref:OptimizeRuntime}Optimizing battery runtime}
+  Rockbox offers a lot of settings that have a high impact to the battery
+  runtime of your \dap{}. In the following sections a short overview of the 
+  most relevant settings and use-cases is given.
+
+\subsection{Display and backlight}
+  The active backlight consumes a lot of power. Therefore choose a setting that
+  disables the backlight after timeout. Avoid to have the backlight enabled all 
+  the time.
+
+\opt{lcd_sleep}{
+  Shutting down the display and the display controller saves a reasonable amount 
+  of power. Choose a setting that will put the display to sleep after timeout. 
+  Avoid to have the display enabled all the time -- even, if the display is 
+  transflective and is readable without backlight. It is more efficient to 
+  re-enable the display and its backlight from time to time than to keep the 
+  display enabled.
+}
+
+\opt{accessory_supply}{
+\subsection{Accessory power supply}
+  As default your \dap{}'s accessory power supply is always enabled to ensure
+  proper function of connected accessory devices. Disable this power supply, if 
+  -- or as long as -- you do not use any accessory device with your \dap{} while 
+  running Rockbox.
+}
+
+\opt{lineout_poweroff}{
+\subsection{Line Out}
+  Rockbox allows to switch off the line-out on your \dap{}. If you do not need 
+  the line-out, switch it off.
+}
+
+\subsection{Codecs}
+  In general the fastest decoding audio format will be the best in terms of
+  battery runtime on your \dap{}. An overview of different codec's performance 
+  on different \dap{}s can be found at \wikilink{CodecPerformanceComparison}.
+
+\opt{disk_storage} {
+  On your HDD-based \dap{} the datarate of the audio files does also have an 
+  impact to the power consumption. The lower the bitrate of the audio files, 
+  the better the runtime.
+}
+
+\subsection{Sound settings}
+  In general all kinds of sound processing will need more CPU time and therefore
+  consume more power. The less sound processing you use, the better for the
+  battery runtime.