Lithium-ion batteries are far better than lead-acids in terms of weight, size, efficiency, and applications. Lead-acid batteries are bulkier when compared with lithium-ion batteries. Hence they are restricted to only heavy applications due to their weight such as automobiles, inverters, etc. The major advantage of lithium-ion. Since both are constructed with different chemical compositions, they also vary in their internal working and chemical reactions happening. Capacity is one of the essential features of any battery. There are several definitions for capacity. Battery capacity can be defined as the total amount of electricity generated by the battery. The durability of secondary batteries is usually indicated in terms of the number of charge-discharge cycles. When the battery is charged completely and used up to its permitted discharge level, it is known as one cycle. Durability is. Energy density denotes the amount of energy delivered by the battery relative to its weight. It is measured in watt hours per kilogram (Wh/kg) or watt-hours per liter (Wh/l). This is another favorable feature of lithium-ion batteries when.