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.
Li-polymer is unique in that a micro porous electrolyte replaces the traditional porous separator. Li-polymer offers slightly higher specific energy and can be made thinner than conventional Li-ion, but the manufacturing cost is higher by 10–30 percent. There is actually a lithium-polymer battery is actually a real Li-po, which uses a polymer . 394 34 462 190 373 331 245 450