button cell battery cr1620.Brief Introduction to the Differences between 18650 Lithium Battery and Polymer Lithium Battery

　　1. Lower price

　　The international price of 18650 lithium-ion batteries is approximately 1 USD/pcs, which is approximately 3 RMB/Ah calculated based on 2 hours. The price of polymer lithium-ion batteries is at 4RMB/Ah for low-end knockoff factories, 5-7RMB/Ah for mid end ones, and above 7RMB/Ah for mid to high end ones. Things like ATL and Lishen can usually be sold for around 10RMB/Ah, and if you have a small order, they are not willing to accept it.

　　2. Not customizable

　　SONY has always wanted to make lithium-ion batteries the same as alkaline batteries, with certain industrial standards, just like batteries 5 and 7, which are basically the same worldwide. However, due to the great advantage of lithium-ion batteries that they can be designed according to customer needs, there cannot be a unified standard. Therefore, up to now, there is basically only one standard model in the lithium-ion battery industry, which is 18650. Other designs are based on customer needs.

　　3. Poor safety

　　We understand that lithium-ion batteries can undergo intense chemical reactions and generate a large amount of gas under extreme conditions (such as overcharging, high temperatures, etc.). The 18650 lithium-ion battery uses a metal shell with a certain strength. When the internal pressure reaches a certain level, the steel shell will rupture and explode, causing a terrifying safety accident.

　　This is also why rooms for testing 18650 batteries generally must be protected layer by layer, and no one should enter during testing. Polymer batteries do not have this problem, even in extreme cases, due to the low strength of the packaging film, as long as the air pressure is slightly high, it will rupture and will not explode. The worst case scenario is combustion. So in terms of safety, polymer lithium-ion batteries are superior to 18650 batteries.

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