Author/Source: Solid-state batteries are batteries that use solid materials instead of liquid ones. Electrolyte is the substance inside a battery that allows electricity to flow. See the full link here
Takeaway
This article talks about why iPhones and other devices don’t use solid-state batteries yet. It explains the benefits of these batteries and the challenges in making them good enough for everyday use.
Technical Subject Understandability
Intermediate
Analogy/Comparison
Regular batteries are like sandwiches with a liquid filling, while solid-state batteries are like sandwiches with a solid filling. The solid filling is safer but harder to perfect.
Why It Matters
Solid-state batteries could make phones last longer and be safer because they are less likely to catch fire. The article mentions that companies are working hard to improve this technology so it can be used in future devices.
Related Terms
Solid-state batteries, Electrolyte
Tech Teacher 
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