The most economical Li-ion battery in terms of cost-to-energy ratio is the cylindrical 18650 cell. This cell is used for mobile computing and other applications that do not demand ultra-thin geometry. If a slimmer pack is required (thinner than 18 mm), the prismatic Liβion cell is the best choice.
10. Solid-state batteries. Solid state drives (SSDs) have helped take data storage to a whole new level in laptops and the same technology could drive battery technology forward. Technically, solid-state batteries could provide the same kind of leap that thin-film batteries could provide over lithium-ion.
The alternate is to get a Li-ion battery with low volume if there is not enough space for a bulky battery. The Li-Po is usually 35% lighter than a Li-ion with a steel shell and the Li-Po is 20% lighter than a Li-ion battery for an aluminum shell. So if weight or mass is the concern, the Li-Po wins easily.
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is li po better than li ion