Re: Criticizing Chinese era lenovo on ElReg...
Not Lenovo fault, rather *your* fault for believing a bunch of PR about USB-C. USB-C is not universal. Rather, it is simply unlabelled which components will work together, and usually unguessable. Sorry, you have been sold a pup by USB-C, and the faster you understand how badly you have been misled, the better.
In this case, consider the situation that Lenovo must design for: say customers want to charge when it is very cold, maybe -10C. Batteries don’t like being charged when cold, and get damaged. So, must Lenovo implement a battery self-heating circuit, which is the normal solution? Well, really in practice no. Because the thermal mass is low, and with a 120W charger it will self-heat anyway in seconds unless it’s really cold - below the sticker number.
But wait a second, what if the consumer connects…..a 10W charger? Then maybe it doesn’t self-heat fast enough, and the battery gets damaged. This is ridiculous, Lenovo can’t add cost requirement to implement an extra heater circuit for when the consumer uses pathetically weak equipment.
Then, they need to figure out how inadequate the charger must be, before this is a problem, and charger should be ignored. 20W? 30W? Yeah I know 100W should be fine, but what *exactly* is the dividing line? Lenovo engineer will have to put some number in the config file, what number will it be? You want Lenovo to institute an f’ing *test campaign*, across temperature, and life, and battery variability, to decide what the one number will be, of “how weak is the charger”. This is going to cost tens of thousands, if not more. And if they get it wrong, it’s a public relations disaster, and whole bunch of customer returns. For a *charger* that used to cost pennies.
Again, fuck that shit. The battery nominal point is 120W, then ship a 120W charger, write 120W in the config file “otherwise report error” and move on.
USB-C PD is a total shitshow. I’m glad the penny is starting to drop.