1.18500 cylindrical rechargeable battery 2.85% of initial capacity at 300 cycles 3. ... widely used in various applications including:High-End FlashlightsLaptop Battery Cell ReplacementsCustomized Battery Pack SolutionsRC Applications, car, plane etcSafety, Alarm, metering, ... device that needs high energy density and low weight Li-Ion 18500 Cylindrical 3.7V 1200mAh Flat Top Rechargeable Battery