The fact that you don't have to recharge the motion controllers with your Mixed Reality headset is a blessing, assuming you have a stash of AA batteries at hand. Hot swapping means you don't have to come back to reality and wait for batteries to recharge before you continue your virtual experience.
But the controllers don't have battery level indicators on them, and there's no obvious sign of power levels when you're inside Mixed Reality either ... or is there? In fact, there is. You just have to know where to look.
Comparing Windows Mixed Reality headsets from Acer, ASUS, Dell, HP, Lenovo and Samsung
Finding your Windows Mixed reality controllers' battery level
To check, you need to be inside the Windows Mixed Reality experience with your motion controllers powered on. To check how much battery you have left in each one, all you need to do is turn each controller over so the back is facing you. You'll now see a handy (but hidden from plain sight) battery meter that shows you how much power is remaining.
This isn't exclusive to one manufacturer's controller, either. Currently, they're all the same reference design by Microsoft and this is built into the Mixed Reality software. In the future the implementation could change, but right now it's all the same.
Despite the fact that it's not immediately obvious, it's actually a nice feature. It's always there, but it doesn't interfere with the immersive experience by being a persistent presence on the display. Well done, Microsoft.
More: Everything you can do in Windows Mixed Reality right now

These are the best deals on Xbox consoles you'll find this month
If you're in the market for a new Xbox One console, you'll want to check these deals out first.

Got a Surface Pro and need a dock? Read this.
If your Surface Pro is your main PC, you can use a docking station to turn it into a powerful workstation. Here's our recommendation for the best dock.

Xbox Series S will be the cheapest way to play free-to-play console games
The Xbox Series S was already a fantastic value console, but with Microsoft's recent change to free to play multiplayer requirements, it offers more bang for your buck than ever before. Here's why.

Here are the best Windows Mixed Reality games you can play right now
To help you decide which Windows Mixed Reality games you should play first, we’ve rounded up the best on offer right now from the Microsoft Store and SteamVR.