I’m not sure this is the case, but with my XA2 fast enough charger, current rose up to ~2100 mAh and started over. Now with Battery Buddy set to 1500 mAh on 10 III I never had problem with any charger.
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The Reduct charger works reasonably with the J2 - but negotiating voltage and current is a bit all over the place, especially with the screen on.
The readily achievable max looks to be 9.5V*2.5A≈24W.
With screen on it would drop to 5V*1.5A=7.5W.
So not only will it work once the USB-PD kinks get sorted out, it works already now too.
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I still can’t get any charger + usb cord combination to cgarge more than 2000mA-2500mA at 4V so about 8W-10W? New Jolla phone. Has anybody had any higher numbers? And yes, I know that slow charging is propably better but I’d like the option to charge faster sometimes.
I presume you are reading that in CSD-tool, Aida64 or similar - with the screen on?
Screen-off i’m getting better numbers.
Aida64 and Battery Buddy yes. How can I check the screen off-numbers? Do those apps make logs?
Not sure - probably over ssh and reading some file.
I don’t believe the apps make logs, no - but they probably just read some sysfs file.
My measurements are from measuring on the cable.
Edit: /sys/class/power_supply/battery/current_now looks like it does what you’d want.
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Can the phone fast charge or does it take the time it will take.
And i never charging at night just in case something happening
Even if i imagine a question mark after your first sentence - it is not at all clear what you are trying to say.
Everything, by definition, takes the time it takes.
I guess anything over ~10W is technically “fast” - you decide if you think 24W is fast enough.
@attah 
, I think they mean:
“Have we got some control over the charging time e.g. with the ability to charge quickly, or do we have to wait until it is finished, without knowing how long it will take?”
And
“As I don’t know the max charging limit, I am a bit afraid to (fast)charge the phone unsupervised at night as it could perhaps overheat or catch fire.”
I hope my NI (natural intelligence) English translation from my tongue to this message is correct enough 
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On the phone you can probably control the charging speed/rate (as mentioned previously). To me, using “time” to refer to this is very strange.
But with a big modern battery and 24W (~1h for 100%) i see no reason to.
It doesn’t seem to develop barely any heat from charging at this rate.
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Yes sorry needed a question mark the question is i have a one plus charger for my old phone but where not sure if that would be to heavy for jolla
I don’t know about logs, but I have had Battery Buddy running as cover while charging, and unlocking the phone I have seen maximum 5931mA on it. It goes down quickly when the screen is on. It’s Lenovo 65W laptop charger.
I can’t actually be sure if its real or imaginary, but i often feel that when charging Xperias with a slower Ampere (1.5mAh max), then the phone will then discharge also slower… So like 5V1.5A, aka 7W, charger being ideal, in my case, for a longer daily battery life
And some punctuation here perhaps?
As i already said way back in the beginning. There is really no such things as a too fast charger - in fact it is not even a charger in the true sense of the word. You can of course disagree with the phone’s settings - and then presumably change them on the phone (not charger!).
With the battery being 5450mAh this is basically that same “1C” charging rate (i.e. 1hr) i spoke about. This is usually seen as good basic fairly conservative value in pretty much all Li-Ion applications.
Currently the phone does not appear to want to draw more than this, no matter the charger - making it a non-issue.
I just tested two different revisions of the Anker 523 Nano 3 47W charger on my J2 (5.2.0.13).
I checked the charging current via the “current_now” terminal file.
The older Anker 523 revision only gives 1,4 A on the IQ port and drops to 0,5 A on the other port.
The newer Anker 523 revision works correctly and gives 2.7 A on both ports. This seams to reach the ~25W charging speed via PPS, cause the newer internal firmware possibly communicates correctly with the Jolla kernel?
Or anything in the old charger might simply be fried…
In the long run this is probably true; these batteries don’t like heat, it shortens their life.
BTW, “1.5mAh max” makes no sense.
I cap charging current at 1A resp. 1000mA.
Heat is poison for litium batteries.
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True true true, I meant 1.5A
Nono, of course all tests were performed at a far-from-full battery.
Though more like 50% due/thanks to the power efficiency of the J2.
Though, having read this:
… i decided to to another test as i might have had a lot of screen-on time when i have charged it otherwise.
So now i have put about 30% into it, starting from 50% taking 24W and now dipping below 20W when coming up on 80% charge.
The highest battery temp i saw was 38.8 (read over SSH as to have it fully screen-off..
I’d barely call the phone lukewarm, let alone hot - IR thermometer says 35 degrees.
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