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What would happen if phones had 2 batteries? - Quora
Tony Battery Box (Cell Holder), For 2 Cell, For Electric
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.
18650 lithium battery holder For Battery 2 x 18650 Cell
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Two-Cell Battery - YouTube
Battery (2 Cell) - Access Gear
Amazon.com: Powerhobby 2s / 2-Cell 7.4v 5200mah 35c Lipo Battery w EC5 Plug 2-Cell (2 Pack) : Toys & Games