Source: NBC News
quote: That's not correct. Generally, batteries that are more energy dense for a given chemistry have much slower charge and discharge rates. Compare the Panasonic UR18650ZTA and the UR18650SAX.
quote: Same manufacturer and basic chemistry, but one can be discharged at 8C without affecting the final capacity much but another starts to quickly lose capacity even discharging at 1C.
quote: The extreme example of this are high capacity rechargeable lithium coin cells, where a 3032 sized cell can have a 100mAh capacity, but won't be able to charge or discharge more than 1mA.
quote: Yes, they would, if you think of the batteries as buckets the bigger the bucket the longer it takes to fill or empty it using a fixed flow of water. It's not necessarily that they charge or discharge at different rates, it's just that a larger capacity takes longer to fill and lasts longer under load.
quote: One battery is 1350 mAH and the other is 3000 mAH; the larger capacity battery does not experience as much of a voltage drop under load as the smaller battery does, but that doesn't really counter what I said.
quote: All I said is that you can charge any modern rechargeable battery at 1C, with the implication being that it is safe to do so. You will not "lose capacity" but your battery may not be suited to a high-current application.
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.