11-03-2019 07:46 AM
just got the c940 delivered. bought the HD version rather than the 4K mainly after owning the surface pro 4 and being disappointed with the battery life that was blamed on the UHD screen
confused on the 65w requirement vs what i read on amazon and other forums on powerbanks.
will 30w or 45w or 48w usb c power banks with PD work on the c940
i have got the charmast powerbank with 18w output and i can tell you that doesnt work!
are there any affordable ones that are compatible with the c940 out there?
thanks in advance
11-03-2019 08:02 AM - edited 11-03-2019 08:02 PM
You'll need a power bank that will negotiate for the voltage your computer requires. Not all do that with every brand. I believe the 940 is looking for 20v like most other computers. 18W means it's doing less than 1 amp, which might work if you leave it connected for a whole day and don't turn the machine on.
I have 4 USB-C AC Adapters. Three 45W and one 65W. All will charge my 920 (which came with the 65W charger). One of the 3rd party 45W adapters won't charge my 910. That's mostly due to the charger not recognizing the 910 and falling back to 5v.
For best results, I wouldn't use anything smaller than 45W.
11-08-2019 01:37 AM
so if i look for travel AC adapters then look for 45W atleast. got that one
and if i look for powerbanks that do 20v with 45w output?
anybody with actual purchase and use of amazon or ebay. do post a link. i will do the same if i get any to work on th c940. loving it otherwise. dont really think the batter life is anywhere close to advertised for the HD version but hey wouldnt be the first time i fell for marketing!
11-08-2019 07:31 AM
There are a few other threads where Community members have posted links to power supplies that work with various Yogas. Since many ARE 20v USB-C PD models, they might be worth a try. You'll need to search around a bit to find those threads or wait until someone with a C940 posts here.
As for battery life, yeah, that's rarely as advertised, though with a few tricks (the same ones they use in testing), you can get pretty close to that. I can still get 5+ hours out of a 3-year-old 910, which I think is pretty good. That's another reason I don't have a battery-based powerbank. I'm rarely on a flight of 5+ hours where there isn't power available on the plane or I can't plug in somewhere during a layover.
01-02-2020 12:15 PM
I bought this Powerbank on Amazon: BatPower PDE 2 P26B USB-C. But charging my Lenovo Yoga C940–14IIL doesn't work although it should according to technical data:
Data of the original charger of Lenovo: 20V & 3,25 A; 15V & 3A; 9V & 2A; 5V & 2A
Data of BatPower: USB-C output 20V; 15V; 12V; 9V; 5V Max 60W
Does anyone know if there are any other criteria for the compatibility?
01-02-2020 12:27 PM
01-18-2020 10:41 AM
will watch out for it on amazon uk
by the way the one below works well at the right speed as an AC adapter for the c940 and saves me carrying the brick
there is a new dual port one out but i have the one above
01-27-2020 03:43 PM
01-28-2020 12:16 PM
I bought a Lenovo USB-C Laptop Power Bank 14000 mAh through chat at the same time as by c940 15" 2in1 hoping that they would have flagged it if it wasn't compatible. Does anyone know if it is? It just says "plugged in, not charging". Please Help.