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The PKCELL INR21700 5000mAh 7.4V 2S1P is a high-density, custom-engineered rechargeable lithium-ion battery pack specifically developed for compact consumer electronics, portable LED lighting, smart home devices, and handheld instruments. Engineered using premium-grade Samsung INR21700 50G cells, this 2S1P configuration delivers a nominal energy output of 37.0 Wh with a stable operating voltage of 7.4 V (maximum charge cut-off voltage at 8.4 V and discharge cut-off at 5.0 V).