Amazon.com: Amazon Basics 8-Pack AA Batteries, High-Capacity 2,400 mAh Rechargeable Battery, Pre-Charged, Recharge up to 400x, Green, High Capacity (2400 mAh) : Health & Household
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Lithium Ion Battery - 3.7v 2000mAh : ID 2011 : $12.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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