How to remove and replace the Surface Pen's battery

Got a Surface Pen that's running low on battery? Here's a handy guide on how to replace the battery.
The Surface Pen is an incredibly useful tool and accessory for the Surface Pro, Surface Studio, Surface Laptop and Surface Book. It's a battery-powered peripheral, meaning at some point the Surface Pen will stop working unless the battery is replaced. The Surface Pen uses a AAAA battery, meaning you may have to find replacement batteries online rather than in stores.

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