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==18650 battery dimension==
[[File:18650size.png]]
<span style="color:red;">Please use high quality batteries from Samsung 35E 18650 lithium battery, Panasonic NCR18650B, Toshiba, etc. Do not use the 18650 battery with built-in protection circuitbecause it will limit the discharge current.</span>
==Raspberry Pi Official GPIO Expansion describe==