Interesting. I get more than that. In one test, with all the killswitches off, I got 14 hours.
If you haven’t done an actual timed test yet, maybe install GNOME Power Statistics, charge up the phone, let it run, then see what the app shows. (You’ll have to scale it down to use it…and maybe use a magnifying glass to read it!)
Not that you have to turn off any running services. Just use it as you normally do.
Hey, I have a powebank that I use to make a portable raspberry pi
This topic made me think, what about the Librem 5 ?
Just in the point of view of power management, if I have a powerbank attached to it, how would it affect the battery ?
How would be the graph ? Will it stay to 100% until powerbank is empty ?
It could be a way to get a full day until the power savings improvements are available (if you don’t mind the double weight)
There are even some that are the size of a credit card. Imagine a silicone L5 case with a little extra space for that. 
I found some that only add to the length (about as wide as the phone and as thick, with usb sticking out in the middle). A power bank should power the phone (but preferably it’s PD rated). Will it also be powerful enough to charge the battery simultaneously? I doubt it.
Please upload lossless PNG images for screenshots rather than highly compressed JPGs. It is difficult to read the text.
Naaaaah, you are thinking like :
When I’m more like my phone has 1 month autonomy between charges !
@JR-Fi : my point would be more like the battery phone stay at 100%, and only drain power from the powerbank
I think I’ve seen that innovation before… 
(CityTalkman 900, about 30years ago)
At least it doesn’t have an entire automobile attached to it!
Sometimes I think some of the old classics should be brought back but with improved insides. That one could be a (less mobile) phone with ridiculous battery and a huge antenna for hugely enhanced reception in rural areas. A couple of other phones over the years were good and could be made great with updated battery technology, better cameras and displays.
now THAT is a blunt weapon …
What about a Diesel aggregate / generator?
Also I personally would not plug my L5 into a energy source until I would be sure that it does not takes any damage.
Somewhere in this forum the advice was given to only use the original power plug and cable for charging because of the supported charging protocol. I hope that will change in the future so that we can use common chargers and cables. Unfortunately the plethora of USB chargers and cables seems chaotic and until now we can’t see from the outside what is supported and there will be (are?) cables supporting higher voltages for charging laptops or so. Not all devices can handle higher voltages. I guess the charging parameters must be negotiated with care. I would not be sure that all cheap cables and chargers do that correctly.
@JR-Fi : Damn ! you killed me with that !! 
@amarok : You can still plug the Librem5 to a tesla ! 100Kw battery for your phone !
To get back to the subject 
Can someone with the Librem5 can share how the graph is when attached to a regular powerbank ? (in use or in idle baseband On)
@amarok, if you are interested in possibly having a more readable output and you are willing to enable ssh on your phone, you could try X11 forwarding to run your application on your phone but display it on another computer. That way you could use the remote computer to control the application window size.
For security’s sake, I suggest disabling the ssh server on your phone after you have run your tests though, especially if you will be carrying it in public and doubly especially if your modem is on.
Those are all .png, except for the last one.
I also have a small solar charger (with built-in battery storage) that I keep in my car in case I ever need power for my Android. It’s only slightly larger than the L5. 
@Purism, Feature request: solar panel backplate FTW! Lol!
I think what you saw is this (or in this discussion) :
Which means no problem to use a regular charging system (5v / 2A), it will just take longer to charge
As I don’t know about the USB-PD protocol, but I assume it probably negotiate the power delivered so it can deliver more than the regular power of powerbanks or small chargers to be adapted to the destination device
I referred to that thread but two posts before or so.
Meanwhile the thread has progressed and I encourage to read it to the and. I don’t want to say anything wrong.
The other part I wrote about the chaos in USB specifications and higher voltages is what I remember out of an article in German computer magazine C’t some time ago. Not even they were able to keep in the know of every detail. They wrote an analogously statement explicitly. I think higher voltage chargers are not very common, yet, but this won’t stay forever. Maybe they will be marked somehow. If negotiation go well and they don’t give to much power immediately everything might be fine. I am not a specialist. The fear or danger of those new cables was written in that magazine article.
They are marked - usually. If they have a fancy-sounding name, they do most likely higher voltage, and sometimes higher current. Both can be risky. The L5 will only negotiate higher voltage with charges capable of Power Delivery, and the high voltage mode is tested best with the supplied charger.
Regular 5V chargers (USB Battery Charging) should be safe as long as they are not doing something crazy like providing the wrong voltage.
A case in point being the chargers for the Planet Computers devices. The charger for my Gemini isn’t marked with a fancy name, but has the following:
Output: 5V==2A/7V==1.67A/9V==1.67A/12V==1.25A
IIRC it uses MediaTek Pump Express.
When my L5 arrives, I guess that I won’t be trying this charger out on it . The Gemini might be OK with Purism’s charger though. The Pump Express web page has this:
The technology is compatible with the international standard of ‘USB PD 3.0 programmable power supplies’, allowing standard USB PD 3.0 fast chargers to boost Pump Express 4.0-enabled smartphones.
I mean - it is going to work, since the L5 is using a “compatible technology” too. Using the supplied one is a recommendation to those who want to be extra safe.
