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Case design - without protruding positive contact.
Be careful that there is no protruding “plus” - for assembly into bags. Not all flashlights and other devices with quick-detachable batteries are suitable for installation - some only require a protruding “plus”!
Recommended for high-power flashlights and other devices with high current consumption.
Without protection board.
Optimal storage conditions for Li-ion batteries are achieved at 40 percent charge of the battery capacity and a temperature of 0...10°C.
Charge lithium-ion batteries only with specialized chargers.
Li-ion 18650 batteries are the most popular battery format for flashlights at present. Combines very high capacity and low self-discharge. Disadvantage - they shrink quickly at low temperatures (from -10°C degrees).
Characteristics:
element type: Li-ion
manufacturer: Panasonic, China (original)
standard size: 18650
nominal capacity: 3450 mAh
minimum capacity: 3350 mAh
internal resistance: <38 mOm (AC Impedance 1 kHz)
built-in security controller: no
rated voltage: 3.6V
minimum voltage: 2.5V
maximum voltage: 4.2V
charging time: 8 hours
rated charge current: 1.475 A
charging time: 4.5 h
maximum discharge current: up to 10 A
element diameter: 18.5 mm
element length: 65 mm
weight: 47 g
number of charge-discharge cycles: 1000 (capacity drops to 80% of the nominal value after 300 cycles)
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