Rechargeable 2000mAh 7.4V Li-ion Battery Pack or Lithium-Ion Battery for Arduino, IoT, and robotic applications. This 18650 lithium-ion battery is very lightweight and small in size compared to Ni-Cd, Ni-MH, and Lead-acid batteries. 7.4 volts best lithium-ion cell battery pack has a very long life without losing charging capacity. Weights just 100grams.
Here is an inside picture of this battery power pack module.
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