What is battery? How do you arrange the cells in a battery?
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Amazon.com: 3.7V 5000mAh 2 Cell Lithium ion 18650 18.5Wh Rechange Battery Pack with 2 Pin MTA-100 Connectors : Health & Household
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2 x CR2032 Coin Cell Battery Box w/ On-Off Switch & Plain Wires : ID 4988 : $1.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Dell 4-cell 52 Wh Lithium Ion Replacement Battery for Select Laptops | Dell UK
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SII Semiconductor Corporation Introduces a New 2-to-3-Cell Secondary Battery Protection IC for Rechargeable Li-ion Batteries Utilizing an Ultra-small Package | Seiko Instruments Inc.