BATTERY, BATTERY PACK, ELECTRONIC APPARATUS, ELECTRIC VEHICLE, POWER STORAGE DEVICE AND POWER SYSTEM

PROBLEM TO BE SOLVED: To provide a battery that can obtain excellent cycle characteristics, and to provide a battery pack, an electronic apparatus, an electric vehicle, a power storage device and a power system.SOLUTION: A negative electrode has a negative electrode double-sided coating part where a negative electrode mixture layer is formed on both principal surfaces of a negative electrode collector, one negative electrode single-sided coating part where a negative electrode mixture layer is formed on only one principal surface on the outer peripheral side out of both principal surfaces of the negative electrode collector, and a negative electrode double-sided uncoated part where both sides of the negative electrode collector are exposed. From one end on the start-of-winding side of the negative electrode, the negative electrode double-sided uncoated part, one negative electrode single-sided coating part, and negative electrode double-sided coating part are provided in this order. In the negative electrode, the ratio of (area density of negative electrode mixture layer on one principal surface side of one negative electrode single-sided coated part)/(area density of negative electrode mixture layer on one principal surface side of other than one negative electrode single-sided coating part) is 1.2 or more.