diff --git a/src/main.rs b/src/main.rs
index 7b08b9a..53a8caa 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,7 +4,7 @@ use std::{
     fmt::Display,
     time::{SystemTime, UNIX_EPOCH},
 };
-use upower_dbus::{BatteryLevel, UPowerProxy};
+use upower_dbus::{BatteryLevel, DeviceProxy, UPowerProxy};
 use zbus::zvariant::OwnedObjectPath;
 
 enum ChargeState {
@@ -39,7 +39,13 @@ struct BatteryStatus {
     rate: EnergyRate,
 }
 
-type BatteryIdentifier = OwnedObjectPath;
+impl<'a> From<DeviceProxy<'a>> for BatteryStatus {
+    fn from(value: DeviceProxy) -> Self {
+        todo!()
+    }
+}
+
+type BatteryIdentifier = String;
 
 struct Entry {
     timestamp: SystemTime,
@@ -58,12 +64,14 @@ fn main() -> zbus::Result<()> {
 
         let device = upower.get_display_device().await?;
         eprintln!("Display Device: {device:?}");
+        let batteries = HashMap::new();
+        let does_contain = batteries.contains_key(&device.path().to_string());
 
         println!("Battery Percentage: {:?}", device.percentage().await);
 
         let tracker = Entry {
             timestamp: SystemTime::now(),
-            batteries: HashMap::new(),
+            batteries,
         };
 
         println!("On Battery: {:?}", upower.on_battery().await);