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I have used a few of those bluetooth headsets that are wireless stereo (TWS) ones and are charged by a case in which you insert them. I haven't used expensive ones, just rebranded chinese ones. All of them seem to get fully charged to 100% from 0% within 30 minutes. The case shuts off charging in 30 minutes and the phone displays 100% battery of the headsets.

So it seems the tiny 30 mAH or so lithium ion polymer batteries are charged at 2C charging current, which I doubt, even the highly advanced batteries of Tesla cars can't accept. How do these bluetooth batteries manage such high rate of charge?

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    \$\begingroup\$ At 30mAh, 2C is only 60mA so there won't be the sort of cooling issues your Tesla faces. It may mean you only get a few hundred charging cycles instead of a thousand; time will tell. \$\endgroup\$ – Brian Drummond Sep 18 at 0:25
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    \$\begingroup\$ they could be lying about the 0% \$\endgroup\$ – jsotola Sep 18 at 0:28

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