Hello,
I am a samsung user (currently s21) and got a pixel 9, especially to setup grapheneos on it. I am currently moving my apps and testing stuff on my new grapheneOS :)
My question is not specific to grapheneos I think, because many people would be complaining about it here I think :)

I am curious about charging speed.
I am using my original samsung charger that output 9v 1.67A or 5v 2.0A.
I know its not a very strong charger, but i think its charging extremly slowy and i dont know why.
My samsung phones charges fast on this charger and the charger gets hot. My pixel charges kinda slow (i believe about 3 hours to get full charge) and the charger does not get very hot : clearly the phone is charging slower than it should even on this small charger.

Is there a kind of charger protocol issue or something I am missing ?

Thanks for any help

  • r134a

    • Post #2
    • Edited

    With that charger it can max deliver 15.03w, if the phone uses the 9v profile, else it can deliver max 10w. In theory u need a charger with a pps profile covering (slighly) above 9V/3A, to be able to charge your phone at 27W.

    Edit: post was made assuming u have a pixel 9 as mentioned (also applies to pixel 9 pro), however in case u have a pixel 9 pro xl, u'll need 18V/2A charger to charge at it's full potentional (37W).

    Hello!
    Yes, thanks for these informations ;)
    What i am curious is the fact the phone is not able to draw the maximum potential of the charger : it gets medium hot after 1h of charging.
    Whereas when charging my samsung, the charger gets hot and charge way faster.

    Almost like it was stuck on the 5v profile and draw only like 1A and was not able to draw 2A.

    I will try to get an app that gives this information to confirm.

    Also, i did not find any setting related to this (appart the battery protection which I enabled to stop charge at 80%).

    So I setup Ampere app, enabled "ignore battery health" settings (or it was not working).
    Tested 1 classic 5v 2A charger : 1500mA charging current
    Tested samsung 5v 2A / 9v 1,67A : 1500 mA charging current
    Tested a dell laptop adapter 5v 3A / 9v 3A / 15v 3A / 20v 3.25 A : 3800 mA charging current

    I do not see the input voltage with ampere, if you have other suggestions.

    For comparison, installed ampere app on my samsung s21, using the samsung 5v 9v charger, it shows 2900mA charging current, almost 2x more the pixel can draw ...

    Anyone having same behavior ?
    Nothing I can tune on graoheneos to improve that ?

    Since the S21 came without a charger, I assume you are using an older Samsung charger from a previous phone, for example an S8. Since I don't know the exact model, I am going to assume that the Samsung charger doesn't support official USB Power Delivery (PD). Samsung's phones use their own fast charging protocol (alongside PD). Since your Dell charger clearly outputs the required power to fast charge your Pixel, the only recommendation you are going to get, is to buy a new (PD3.0 or official PPS) charger.

    Hi
    Thanks ! So basicly a samsung "standard" not so "standard" issue ?
    I can t remmember from which phone I got this charger, reference is ep-ta20ebe if my eyes are not wrong ;)
    Reading your answer I assume there isnt any parameter I could tune on the OS side to improve this, so I need to get a more recent charger.

    Stupid question but any "recent" samsung wall charger would do ? I find them cheap, reliable and they dont overheat. I d like to avoid no name brands.

    I will try to find

    PD3.0 or official PPS

    Thanks again