Yoshino Solid State Battery Power Station, Test and Teardown!

Second update: I did some more research on the Safety Data Sheet that comes up from the part number/QR code on the cells. At least two of the chemicals listed are liquid, organic solvents, normally used as electrolyte in lithium ion batteries. So...

Thank you for doing this. After watching Matt Ferrell take these at face value, it's funny to see these things aren't really solid state.

Update. I did look into that battery data sheet I found and it does seem to trace back to a Chinese company that claims to be making solid state batteries. So it's possible that the manufacturer of the cells is also claiming they are "solid state" batteries. I think they are more like semi-solid state. But at this point, I don't know if it matters. The stated watt hours per kilogram are roughly in line with typical lithium ion batteries, the Yoshino power stations charge slower than the competition, and clearly the batteries can and will catch fire in the right circumstances. So I'm not sure what kind of revolution their "solid state batteries" are. But I'm always happy to be corrected. So if anyone finds any contrary info, please share it. And in case anyone was wondering if smoke and fire necessarily means Yoshino are lying; here are some quotes from their website: _"Nail Penetration Test The nail penetration test evaluates lithium-ion battery safety by puncturing to simulate damage and monitor reactions. Yoshino solid-state batteries did not display any serious reactions in comparison to prior lithium-ion models that displayed smoke or fire." "Traditional Lithium-ion batteries pose dangerous potential for combustion due to their use of volatile liquid electrolytes, which can easily be exposed to air and ignite. On the other hand, solid-state batteries utilize nonflammable solid electrolytes - meaning even if they get hot from overcharging or current load issues, there is no risk of a fire occurring." "Another significant benefit of solid-state batteries is their safety compared to other rechargeable cells. Since they don't contain the sameany liquid components or combustible materials"_ So they say in multiple places that their batteries contain no flammable materials, and won't smoke or catch fire when damaged. Just saying.

Thank for the teardown and battery puncture testing, that's what we need.

According to the 3.72V printed on the battery pouch, it is Lithium Polymer battery. These batteries are a type of rechargeable battery that use a polymer electrolyte instead of a liquid electrolyte. LiPo batteries are sensitive to overcharging, over-discharging, and physical damage, which can lead to swelling, leakage, or even fires.

Thanks for the exposé! You've saved me (and perhaps many others) a lot of money. Even the name Yoshino connotes a Japanese company, as opposed to a Chinese one. I have nothing against Chinese tech or companies. I even lived in China for a while 30 years ago. There are many very high standard enterprises there, as well as many innovative technologies. There are also many disreputable ones ... like anywhere.

you saved me money i was thinking about buying that exact model after ! i saw a few " reviews" but neither went all the way and opened it up and i wasn't going to commit before knowing for sure because i suspected this very thing

Thanks for being very thorough even at your own cost. We need more like you!!!

Thank you for this, you've gained a subscriber. A few weeks ago I saw another YouTube 'review' of the Yoshino as the 'first solid state' but they never took it apart during the whole video... and I was like.... really? Even after they found its weight and output had no indication/benefit in line with solid state, they didn't question it. So thank you for doing it properly! Edit: And this is why I prefer personal power banks that use metal cased 18650s or similar, not pouch cells in a thin plastic case.

Thank you! You just earned 7 subs…. We’re a bunch of firefighters who were anxiously awaiting a solid state battery solution from an AMERICAN company. Our primary use is for powering/charging 2-way radio gear and drone batteries in the field. We specifically avoided the newly released DJI Power unit(s) for those reasons. With 11 vehicles to equip (replacing very old Jackery units), your work saved us a small fortune. Thanks again!

I think your my new Fav, Gets straight to the point, all about the content. Big thumbs up

Good bust man. When a chinese company is selling something that basically doesnt exist , you know it's fake. Reminds me of the 'TrustFire' 9000 mAH 18650's...

Excellent testing. Thanks so much. Peace, Calvin.

The inrush current for that drill is probably about 3kW so I'm impressed that any of the power banks coped with it. It'd be interesting to see the current output of the powerbanks for the first second or so of the drill spinning up but you'd need a fancy oscilloscope to record that.

Thank you! That was a good review. And great tear down. Great work 👍

Thank you for your hard investigating work. That was very helpful.

Thank you sir for posting this video.

Thanks for the info! Really appriciated

Thanks showing this. You just helped me decide what buy, what not to buy and how not to be scammed. ^^

thank you for checking