Source: NBC News
quote: You're missing the point, the battery makers tailor the geometry of the battery to optimize for high current draw or high capacity.
quote: Look at the discharge graphs, the high capacity ZTA has almost a 250mV drop between the 0.2C (0.6A) and the 1C rate (3A), while the low capacity SAX has only about a 100mV drop between the 0.2C (0.27A) and the 2C rate (2.7A).
quote: You linked to a Lithium ion CR3032 that could be charged or discharged at 1C, I linked to one that cannot. Your blanket statement of "any modern rechargeable battery at 1C" is wrong.
quote: I'd be willing to bet money that the one you linked to could be charged at 1C even if the spec sheet says no. I would also say that what's commonly accepted by most people as a 'rechargeable battery' is not one of these niche button cells, rather it would be a cell phone, camera battery, AA or AAA type - all of which will charge and discharge safely at 1C.
quote: A button cell is hardly niche, there's billions of them made each year. They're just tailored to a different market, low self discharge and high capacity in a small size without a need for much current draw.
quote: 1C isn't some magic number, it's just that rather than choose to list energy storage in joules or some other unit, they settled on Ah. That many batteries can be charged in an hour or less doesn't grant some special physical significance to 1C.