Most digital pens for Windows are rechargeable or have a replaceable AAAA battery. Before you begin, check the instruction manual that came with your pen.
For most pens, you can replace the battery by unscrewing the end of the pen. If you need more specific instructions, check with your pen manufacturer. Some pen manufacturers include:
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Acer
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Asus
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Dell
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HP
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Lenovo
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Samsung
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Surface
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Wacom