8 ms·
Your theory might make sense if the voltage was actually specified, but when I last bought a USB-C power bank I could not find that information anywhere, so I d
by fanf2 3y ago
Your theory might make sense if the voltage was actually specified, but when I last bought a USB-C power bank I could not find that information anywhere, so I did not know if I was comparing like with like.
- jfengel 3y agoIn a saner world, it would be implicit in the USB-C. As it is, you know that it supports 5V. It might also support higher voltages (up to 20V), though if it doesn't specify I wouldn't assume. If you need higher voltage, you'll have to look for a battery that specifies it. (And hope that the package isn't lying.)
- soneil 3y agoEvery powerbank vendor I've seen gives the battery rating at 3.6/3.7V, so USB implying 5V gives us misleading values. So a 20,000mAh powerbank is 20*3.6V=72Wh, not 20*5=100Wh. I've never seen a vendor that specifies 3.6V, the best you can hope for is that they give mAh and Wh so you can derive it yourself. If we need the Wh rating to keep the mAh rating honest, the mAh becomes redundant before the Wh does.
- chrisnight 3y agoI’m not sure where you live, but I believe every battery sold in the US legally is required to label their I/O voltage and amps, and capacity voltage, amp hours, watt hours. At the very least, every wall outlet and power bank I’ve seen has text somewhere that tells what it outputs, with the powerbanks aswell having capacity, both amp hour and voltage. Though I will say the text is rather small.
- fanf2 3y agoThe description of a typical power bank leaves voltage and watts implicit, as far as I can see https://www.amazon.com/dp/B07S829LBX/ https://www.amazon.com/dp/B07S829LBX/ I mean, I can work out what they probably are with a little general knowledge and arithmetic, but it isn’t as clear as you suggest.