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Kastar 2 Pcs AAAA 1.2V 400mAh Battery and USB Charger Replacement for Active Stylus Pen, Surface Pen Battery, Surface Pro 3/4 Pen, Digital Pen MS Surface Pen, Dell Digital Stylus, Bamboo Ink
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Rechargeable Battery AAAA Ni-MH Battery with Charger for Surface Pen / Stylus, Alarm Clocks, Flashlights, Bluetooth Headset - AliExpress
PicklePower 8 Pack AAAA Rechargeable Battery for Surface Pen, Active stylus pens, Lenovo pen, Asus stylus - AliExpress
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Kastar 2 Pcs AAAA 1.2V 400mAh Battery and USB Charger Replacement for Active Stylus Pen, Surface Pen Battery, Surface Pro 3/4 Pen, Digital Pen MS Surface Pen, Dell Digital Stylus, Bamboo Ink
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How to remove and replace the Surface Pen's battery | Windows Central
Amazon.com: PowerTrust AAAA Battery for Surface Pen, Rechargeable AAAA Battery for Active Stylus LED Flashlight and More Devices (4) : Health & Household
a bit of a con: surface pen batteries running out in the middle of a class : r/Surface
Amazon.com: ANVOW AAAA Batteries, Rechargeable AAAA Batteries for Surface Pen, Rechargeable AAAA Battery for Active Stylus, Ni-MH 1.2V 400mAh with Storage Box, 4 Count : Health & Household
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AAAA Rechargeable Battery,500mAh Ni-MH Battery for Surface Pen Active Stylus Battery for Bluetooth Earphone Alarm Clock - AliExpress