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Usually I would take any battery breakthrough claims with a huge grain of salt, but TDK is a very well established company, so this seems pretty exciting.

The big open question is whether and how this can be scaled up to larger battery sizes in a safe and functional way. Still exciting to see!

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That would be great, but wireless earbuds and watches greatly need battery advances to overcome the current tedious ways to use them. Most smart watches need to be charged in a matter of 1-2 days, and wireless earbuds have to use extra batteries in their carrying cases to even hope to have enough charge available for when you need them. It's nice that we may substantially relieve these limitations.

> "The ceramic material used by TDK means that larger-sized batteries would be more fragile, meaning the technical challenge of making batteries for cars or even smartphones will not be surmounted in the foreseeable future, according to the company."

But the insanely small batteries in AirPods might be fine. Maybe even smart watch sided, let’s face it those are close to coin cell sized.

It could still end up making a major difference.

Would fragility really be a huge concern in more rigid flagship phones? Screens are already quite delicate It's not impossible to build a phone that doesn't flex meaningfully under normal conditions.

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