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Features: Portable battery mobile power, suitable for 3.7V 18650 rechargeable battery. The DC interface supports 8.4V input and output. The USB interface can the mobile phones. No need to welding the battery, which reduces the internal resistance of the battery and improves the battery discharge performance and battery lifespan. Supports protection functions such as overcharge, overdischarge, and overcurrent.

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Features: Portable battery mobile power, suitable for 3.7V 18650 rechargeable battery. The DC interface supports 8.4V input and output. The USB interface can the mobile phones. No need to welding the battery, which reduces the internal resistance of the battery and improves the battery discharge performance and battery lifespan. Supports protection functions such as overcharge, overdischarge, and overcurrent.

Flyflise 8.4v Battery Mobile Power 4 X 18650 Waterproof Battery Pack Case With Dc And Usb Interface Strap For Bike Light Headlamp Mobile Phone Black 4