What’s the difference between Lithium Ion & Lithium Polymer

Lithium Ion L Polymer

There are two main battery types that you’ve probably heard of. One being Lithium Polymer and the other being Lithium Ion. Many devices use either one, but what’s really the difference between the two battery types and should you really care what battery your device has?

Lithium Polymer

Lithium Polymer is the more flexible kind of battery type, meaning that it can be more versatile with the way it’s designed and package. The main reason that it’s called Polymer is because the package that the battery is encased in is made up of Polymer, however, the battery itself is a liquid/gel type of substance that makes it easy for it to be packaged into battery packs.

This is sometimes why Lithium Polymer is such a favorable choice for some companies to use it. If the battery can be versatile in design, then the product itself can be designed with more freedom. This can lead to more flat designs with a product because the battery can be spread out or more packed in one place by choice.

Lithium Polmer EN

By doing so, a product can be what the creator had in mind. Lithium Polymer batteries can be lightweight due to their liquid gel form and how they can be placed in a spread out manner. Polymer batteries, being a gel can actually produce gas while it’s charging, so manufacturers should make the design to allow for the expansion of the battery, so if the battery does expand nothing will get damaged.

Lithium Polymer batteries can be more costly to produce due to their versatility by design and their energy density is not as good as Lithium Ion, which means that their battery level will decline quite quickly when it’s being used.

Lithium Polymer batteries can mainly be used for designing a product that is meant to be quite slim, or have a design that is not traditional this way, the manufacturer can make their product the way they envisioned. If the product doesn’t need a unique design, then Lithium Ion will be used.

Apple MacBook                                                               Apple MacBook Pro 15″ 5600mAh Li-po Battery

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A great example of where Lithium Polymer batteries are used are MacBooks. MacBooks tend to be very slim, then the batteries also have to be slim. Companies take advantage to produce Lithium Polymer batteries and Lithium Ion batteries because both of them tend to degrade and they know some people prefer one over the other.

Lithium Ion

Lithium Ion batteries are the most commonly used type of batteries that is in many electronics. Ion batteries are the opposite of what Lithium Polymer batteries are in the way they are designed. Lithium Ion batteries are densely packed together and the end product is a rectangular battery pack.

Ion batteries have high density and low discharge energy, because of that they are used a lot since they can last longer when a device is in use.

Lithium Ion


However, the main flaw with Lithium Ion batteries is the degradation of the battery even when the battery is not in use. Lithium Ion can also be damaged depending on their environment, especially in high temperatures Lithium Ion batteries can be damaged quite heavily.

Ion batteries are popular to use and will be continued to be used for a long time because they are simple to make and can last a long time in the short term, even though the long-term quality of the battery degrades, improvements are being made to make Ion batteries better.

Samsung Galaxy S5                                                                   Samsung Galaxy S5 Lithium Ion Battery

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Lithium Ion is commonly used with many laptops and phones because it can be compressed quite a lot and if needed, the owner of the battery can more easily replace the battery. Lithium Ion batteries are a more squared shape shaped and are completely solid since the small Lithium Ion packs are tightly compressed into the casing. It’s common for companies to sell phone replacement batteries because Lithium Ion batteries can degrade over time and may need replacement because the battery is too damaged to make a long enough battery life.


Lithium Polymer and Lithium Ion are not exactly different types of batteries, they’re more different types of designed batteries. They function similarly, but the way they come to be are different and what kinds of devices they are inputted into are basically the only difference between the batteries.

You really shouldn’t worry about your devices having either one since both of them are primarily the same, although Lithium Ion is still dominating, there isn’t any logical sense to use Polymer instead.

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