S21 Ultra battery life issues

[Chrisharry]

Hi all I'm having issues with my battery. I have had the phone 3 days and have imported my apps etc from old phone. Its lasting about 10 hours with it predicting to do so today as well. I'm down at 79% after taking it off charge less that two hours ago and barely using it.

I saw a similar post suggesting to reset the cache but it just isn't working.. I have watched 3 videos on how to do it, I follow them step by step and it just reboots my phone normally..

On the battery stats it says chrome is the biggest culprit. I use chrome for work and has all my shortcuts etc save so I really don't want to switch as I should be able to use the browser I choose without issue. I have upgraded from the p30 Pro and usually get a full day out of it every time and that's with heavy use...

Is their a known error/ fix as I'm about ready to send it back.

I'm using the same charger I used for the p30 Pro since Samsung didn't even provide one for this phone..

[Pugs1957]

Is your P30 Pro running Android 11?

[Chrisharry]

Thanks I have now done that and applied optimisation techniques

[Chrisharry]

It's running 10.. is 11 a battery hog?

[JAMES4578]

@Chrisharry  ok, let us know how it goes.

[Pugs1957]

No Android 11 is fine, the issue is most social media apps and Chrome are not fully compatible. I don't use social media and use Samsung Browser and I get 2 days use.

[Joeeye]

On the charger front, I wouldn't recommend using Huawei's charger on your S21, it's both inefficient and possibly more harmful to Samsung devices. I own both the P30 Pro and S21 Ultra and neither phone charges well against the other vendors charger. I'd recommend getting a genuine 25W Samsung charger, or if you want a little future proofing, the 45W charger from ELECJET on Amazon. It supports all Samsung charging speeds from 15, 25 and 45W and is about the same price as a genuine 25W charger from Samsung (the only 3rd party charger I know which supports Samsungs 45W charging speed).

[Chrisharry]

Thanks Joeye I'm not using the p30 charger it's a 30w ravpower charger. Would that have the same concerns?

[Joeeye]

I can't say for certain but getting the supported PD charger is highly recommended. Whilst you can technically use any USB c charger to charge, from my own experience with my Samsung devices, using genuine Samsung chargers work best in both charging speed and heat dissipation wise. As I mentioned before the only 3rd party charger I know which works 100% effectively like a genuine Samsung charger is the ELECJET.

[John19691969]

S21 ultra does not do 45 watt charging (25w max)

[Joeeye]

I know, never said or suggested otherwise