diff --git a/tmux/tmux.conf b/tmux/tmux.conf
index 84320e2..3389de4 100644
--- a/tmux/tmux.conf
+++ b/tmux/tmux.conf
@@ -12,3 +12,6 @@ set -g default-terminal "tmux-256color"
 
 # force utf-8
 setw -gq utf8 on
+
+# show battery life
+set -g status-right "#(cat /sys/class/power_supply/BAT0/capacity)% | #[fg=black]%d %b %R"