diff --git a/hosts/nb/modules/sway/sway.conf b/hosts/nb/modules/sway/sway.conf
index 28c95af..7995b52 100644
--- a/hosts/nb/modules/sway/sway.conf
+++ b/hosts/nb/modules/sway/sway.conf
@@ -70,7 +70,7 @@ bindsym $mod+d exec foot -a launcher -e env TERMINAL_COMMAND="foot -c /etc/xdg/f
 #bindsym $mod+d exec --no-startup-id bemenu --dmenu="dmenu -i -fn 'Source Sans Pro-10' -nb '#212121' -sb '#2b83a6' -sf '#ffffff'
 
 # start an explorer
-bindsym $mod+e exec --no-startup-id thunar
+bindsym $mod+e exec --no-startup-id nautilus
 
 # switching window with win+tab
 bindsym $mod+Tab exec --no-startup-id wofi  -show window
@@ -260,7 +260,7 @@ assign [app_id="foot" title="^(?!terminal-sway)$"]   → $ws2
 assign [app_id="chromium"]            → $ws3
 assign [app_id="firefox"]             → $ws3
 assign [app_id="librewolf"]            → $ws3
-assign [app_id="pcmanfm"]             → $ws4
+assign [app_id="nautilus"]             → $ws4
 assign [app_id="libreoffice-calc"]    → $ws5
 assign [app_id="libreoffice-writer"]  → $ws5
 assign [class="vlc"]                  → $ws6
@@ -310,6 +310,9 @@ exec dunst
 exec 'sleep 2; swaymsg workspace "$ws8"; swaymsg layout tabbed'
 exec mako --default-timeout=5000
 
+# Battery low warning every minute
+exec_always sh -c 'while :; do battery-alert-swaynag; sleep 60; done' &
+
 # wallpaper
 # output eDP-1 scale 2 scale_filter linear
 output eDP-1 mode 2880x1920 scale 2 scale_filter linear
diff --git a/hosts/nb/modules/sway/sway.nix b/hosts/nb/modules/sway/sway.nix
index 7f5fc2a..873598e 100644
--- a/hosts/nb/modules/sway/sway.nix
+++ b/hosts/nb/modules/sway/sway.nix
@@ -17,6 +17,44 @@ let
     '';
   };
 
+  battery-alert-swaynag = pkgs.writeShellScriptBin "battery-alert-swaynag" ''
+    #!/usr/bin/env bash
+    set -euo pipefail
+
+    # Detect a battery
+    cap_file=""
+    status_file=""
+    for d in /sys/class/power_supply/BAT*; do
+      if [[ -f "$d/capacity" ]]; then
+        cap_file="$d/capacity"
+        status_file="$d/status"
+        break
+      fi
+    done
+
+    if [[ -z "$cap_file" ]]; then
+      exit 0
+    fi
+
+    capacity=$(cat "$cap_file")
+    status=$(cat "$status_file" 2>/dev/null || echo "Unknown")
+
+    if [[ "$capacity" -lt 20 && "$status" != "Charging" && "$status" != "Full" ]]; then
+      stamp="/run/user/$(id -u)/.battery_swaynag_stamp"
+      now=$(date +%s)
+      last=0
+      if [[ -f "$stamp" ]]; then
+        last=$(cat "$stamp" 2>/dev/null || echo 0)
+      fi
+      # Avoid spamming: at most once every 5 minutes
+      if (( now - last >= 300 )); then
+        echo "$now" > "$stamp"
+        swaynag -t warning -m "Battery low: ''${capacity}% - plug in the charger." -b "Dismiss" "true" &
+        disown || true
+      fi
+    fi
+  '';
+
 
   sway-conf = builtins.readFile ./sway.conf + ''
     exec swaybg -m center -c 252525 -i ~/.wallpaper.png
@@ -32,6 +70,7 @@ in {
     waybar
     wayland
     wofi
+    battery-alert-swaynag
   ];
 
   programs.sway = {