this post was submitted on 04 Apr 2025
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Dropping an alkaline battery on its base is a quick and easy way to tell wether it's full or not. Drained/old ones bounce, fresh full ones wont.
Another fun battery one - most remote controls work by flashing an infrared LED we can't see with the naked eye, but every cellphone camera can see the flashes as purple light.
If you think a remote has dead batteries, open your camera app, point the remote at the camera, and push a button while looking at your camera app. You should see flashes. No flashes means the remote isn't working, probably dead batteries.
There's a lot of Bluetooth remotes out there these days that DONT do this so be aware of that too.
Also you can deform an alkaline battery to get a little more juice when your remote is dying. Like pinch the sides with pliers.