diff --git a/apps/drained/README.md b/apps/drained/README.md
index 74300da59..e4217493b 100644
--- a/apps/drained/README.md
+++ b/apps/drained/README.md
@@ -10,12 +10,12 @@ With this app installed, your Bangle will automatically switch into low power mo
 
 ## No backlight (#2502)
 [x] LCD brightness
-[ ] LCD timeout
+[ ] LCD timeout?
 
 ## Peripherals
 [x] Disable auto heart rate measurement in health app (#2502)
 [x] Overwrite setGPSPower() function (#2502)
-[ ] Turn off already-running GPS / HRM
+[x] Turn off already-running GPS / HRM
 
 ## Features
 [ ] Wake on twist -> off (#2502)
diff --git a/apps/drained/app.ts b/apps/drained/app.ts
index 1cb1b9d44..029c64f47 100644
--- a/apps/drained/app.ts
+++ b/apps/drained/app.ts
@@ -1,3 +1,5 @@
+const app = "drained";
+
 // from boot.js
 if(typeof drainedInterval !== "undefined")
   drainedInterval = clearInterval(drainedInterval) as undefined;
@@ -6,7 +8,18 @@ if(typeof drainedInterval !== "undefined")
 Bangle.setLCDBrightness(0);
 
 // peripherals
-Bangle.setGPSPower = Bangle.setHRMPower = (_val: boolean, _name: string) => false;
+const powerNoop = () => false;
+
+const forceOff = (name: "GPS" | "HRM" | "Compass" /*| "Barom"*/) => {
+  (Bangle as any)._PWR[name] = [];
+
+  // if(name === "Barom"){ setBarometerPower(...) }
+  //                               ^^^^
+  Bangle[`set${name}Power`](false, app);
+  Bangle[`set${name}Power`] = powerNoop;
+};
+forceOff("GPS");
+forceOff("HRM");
 
 // events
 Bangle.removeAllListeners();