THE 18650-1S4P 3.6V 13.4AH PACK BATTERY 
The 18650-1S4P pack 3.6 V 13.4AH are needed:
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High-power LED flashlights, tactical lights, search-and-rescue lamps, industrial head-lamps
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Portable outdoor lighting – camping lanterns, work lights, bicycle lamps
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Battery boxes for small solar street or garden lights
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Mobile 3C accessories – power banks, Bluetooth speakers, pocket projectors
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Hand-held testers, portable instruments, laser rangefinders
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Toys & models – RC cars, aircraft, robots
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Light-duty industrial devices – portable printers, POS terminals, data collectors
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Medical / safety – portable ultrasound, patient monitors, emergency alarms, thermal imagers
The pack is usually supplied as a protected “battery box” with integrated over-charge, over-discharge, over-current and short-circuit protection, rated for about 5 A continuous discharge.
