fix: undefined in battery limit systemd service

Author: draphy

README.md

@@ -74,7 +74,7 @@ If you love that vibe — welcome home.
 - 📦 **Smart uninstall** — Tracks packages installed by draphyOS for clean removal (full reset to pre-install state)
 - 🔋 **Battery health** — Configurable charge limit with auto-detection for 10+ laptop vendors
 - 🔀 **Version migrations** — Seamless upgrades between draphyOS versions
-- 🖥️ **VM detection** — Automatic picom optimizations for virtual machines
+- 🖥️ **VM mode** — Optional picom optimizations for virtual machines (`--vm` flag)
 
 ### Development Tools
 - 🐳 **Docker** — Container runtime with rootless setup (user added to docker group)
@@ -126,16 +126,18 @@ draphyOS also works on other Fedora editions. The installer will set up i3 along
 
 > **⚠️ Make sure you have [Fedora installed](#-prerequisites) before proceeding.**
 
-### One-Command Install
+### Install
 
 ```bash
-curl -fsSL https://raw.githubusercontent.com/draphy/draphyOS/latest/install.sh | bash
+git clone https://github.com/draphy/draphyOS ~/.draphyOS && ~/.draphyOS/install.sh
 ```
 
-Or clone and run:
+### VM Install
+
+If installing in a virtual machine, use the `--vm` flag:
 
 ```bash
-git clone https://github.com/draphy/draphyOS ~/.draphyOS && ~/.draphyOS/install.sh
+git clone https://github.com/draphy/draphyOS ~/.draphyOS && ~/.draphyOS/install.sh --vm
 ```
 
 ### Post-Installation
@@ -169,6 +171,8 @@ update-draphyOS              # Interactive menu
 update-draphyOS -u           # Quick system update
 update-draphyOS -d           # Update draphyOS configs
 update-draphyOS -v           # Fedora version upgrade
+update-draphyOS --vm         # Enable VM mode
+update-draphyOS --no-vm      # Disable VM mode
 ```
 
 ### Features
@@ -920,10 +924,19 @@ draphyOS has separate WiFi and Ethernet modules that auto-hide when disconnected
 <details>
 <summary><strong>Running in a VM? Display not refreshing?</strong></summary>
 
-**Note:** The installer auto-detects VM environments (VirtualBox, VMware, QEMU/KVM, Hyper-V) and applies these fixes automatically.
+Picom's `glx` backend doesn't work well in virtual machines. Use VM mode:
 
-If not auto-detected or you need to apply manually, picom's `glx` backend doesn't work well in virtual machines. Fix:
+**Option 1: Use the `--vm` flag during install:**
+```bash
+~/.draphyOS/install.sh --vm
+```
 
+**Option 2: Enable VM mode after installation:**
+```bash
+update-draphyOS --vm
+```
+
+**Option 3: Manual fix:**
 1. Edit `~/.config/picom/picom.conf`:
    ```ini
    backend = "xrender";
@@ -933,6 +946,11 @@ If not auto-detected or you need to apply manually, picom's `glx` backend doesn'
    ```
 2. Restart picom: `pkill picom && picom -b`
 
+To disable VM mode and restore GLX backend:
+```bash
+update-draphyOS --no-vm
+```
+
 > **Note:** Rounded corners and blur aren't supported with `xrender`, but opacity and shadows still work.
 
 </details>