Question Battery life 11" Tab S9
- Thread starter sunking101
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My usage is always Internet, YouTube and newspaper apps. That's all I ever do. You don't expect me to literally recreate my usage of each app to the nearest minute? I could spam this thread with screenshots of my battery stats and the Tab S7 slays the Tab S9 every single charge cycle. It isn't even close.
For it to be an apples-to-apples comparison. Yes.
To be honest, those are just snapshots; one from each device. To get a good idea of true usage. You would need to capture daily usage data for at least a week, two would be better. The more snapshots you take, the better data you have to analyze. Doing just one snapshot for each device doesn't really show the whole picture.
To be honest, those are just snapshots; one from each device. To get a good idea of true usage. You would need to capture daily usage data for at least a week, two would be better. The more snapshots you take, the better data you have to analyze. Doing just one snapshot for each device doesn't really show the whole picture.
Yeah but I'm telling you, I get between 7:15 and 7:40hrs SOT every single cycle for the S9. I always have the same usage pattern. Maybe more browsing one time, perhaps more YouTube viewing another time but always roughly the same SOT. My Tab S7 with 2.5 year old battery gives me 8:30hrs to 11:30hrs every single cycle (approx 8:30hrs if I don't use it much per day & one charge lasts me all week, and approx 11:30hrs if I use it heavily over the course of a couple of days). The Tab S7 is a battery beast.
I am curious to know what your usual SOT with the Tab S9 is?
Try running dark mode in everything. (it's probably the only thing that will help at this point).
One of the pro's about LCD's is they have relatively static power consumption for different content, and power consumption scales with just the brightness. OLED power consumption will scale with both color and brightness, and my guess is that web browsing and news have a lot of white space.
It's a shame that OLED's carry such a power penalty.
Lol if you compare for example just Samsung internet, youtube, and daily mail online usage S9 is significantly more efficient:This is my last battery cycle on the Tab S9.
I have the same usage pattern and always get approx 7.5hrs SOT.
samsung internet:
s7: 172 min, 23.8%
s9: 232 min, 8.0%
also something doesn’t add up, the battery drain percentage are all under single digits, it seems like something Else is draining your battery that’s not shown here.
Another
who can't bear to hear that the Tab S9 has worse battery life than the S7 and S8. It's not even close.
That’s a weird response but okay. I just decided to purchase an s9 and will give an update and see if that’s actually the case once it comes in in a week. (I’ll have my tab s8 in hand for a few days crossing over as a point of comparison)Another
Edit: I’ve seen another thread where the percentage doesn’t seem to match up either for the percentage used per app and the total percentage used. My guess is it’s either the Oled screen being significantly more inefficient (when dark mode isn’t enable, like in your case), or that the 8gen2 idle drain is higher on the tab s9 due to firmware bug that prevent it from entering lower freq state.
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I don't use dark mode, no.
Have you installed a translation plug-in and read the review in German tech site Chip.de?
Just got the tablet yesterday and indeed the s9 is running around 1 watt extra at idle compared to s8 (1.2watt vs 2.3watt). Wifi and screen brightness (below 20%) doesn't have tangible effect on the power consumption. I checked the cpu core freq with the toolbox app on both device and noticed that s9 actually ramps up the prime core quite frequently, alow with the A715 cores up to 2ghz. The s8 when idle doesn't exhibit this behavior as much (using mostly the A510 instead of the prime and performance core). Samsung needs to update their CPU scheduler since the ramp up is unnecessary so say the least. Un the other hand. Standard by over night shows the s9 much better than the s8. Dropping only 1 % vs 4 % on the s8 when both are connected to wifi.
Another update, power consumption is more or less the same after a week of use, but screen on time feels a bit longer now with about 5 hours of browsing&YouTube going down by 45%. One weird thing to note is playing cod mobile for 30min only drops the battery by ~6% with 3 separate sessions, which is significantly better than s8 (~13-14%), meaning power consumption when gaming isn't significantly higher than browsing&streaming video 
You say that 5 hours of browsing and YouTube drops your battery by about 45% so that would suggest you're heading for over 10 hours of SOT but I have never got more than 8.5 hours on mine straight from the charger. I'll agree that the first 5 to 7 hours of SOT are fairly decent but after that the battery tanks.Another update, power consumption is more or less the same after a week of use, but screen on time feels a bit longer now with about 5 hours of browsing&YouTube going down by 45%. One weird thing to note is playing cod mobile for 30min only drops the battery by ~6% with 3 separate sessions, which is significantly better than s8 (~13-14%), meaning power consumption when gaming isn't significantly higher than browsing&streaming video
Yes gaming seems to drain the battery impressively lightly but for me a brand new premium tablet should deliver 10 hours of SOT without question when browsing or streaming video and thus I remain incredibly disappointed with the 11" Tab S9's battery life. A routine 7.5 to 8.5 hours of SOT is just not good enough in 2023 from an £800 tablet equipped with the latest tech. Samsung clearly needed to put a bigger battery in this thing because mobile phones can manage better stats than this.
I do routinely get 9 hrs from 85% down to single digit percentage from mixed usage of note taking, just took a screen shot rn
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Yeah... but notetaking.
How much notetaking could you do on an S7?
15 hours? Your screenshot doesn't show your battery percentage...
There is a silence amongst most of the reviewers on battery life. We just get that it's "good" or "will last a couple of days" which is of course useless info. Only a couple of tech sites have actually done tests and both say that the runtime is significantly less than the 11" S8.
That is my beef entirely yet no users seem at all upset that they've lost hours of SOT with this generation of the 11" Tab and I find that baffling. Video streaming and web browsing return HOURS less SOT. I don't game or take notes so I notice this huge loss.
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S8 for me last about 6 -8 hrs with active note taking. It's a bit longer on the s9 now. I find standby to be much better than before. Only downside is power consumption when browsing is a bit higher. It seems like it's scheduling issue anyhow which should be fixed later. I remember my tab s8 having terrible batter life at first but also got better over the year after all the updates. Again no complaints on battery life on my end, it last almost 5 -6 hours browsing/watching video easily from 85%-40%.
iceepyon
Senior Member
It takes about a week for the OS to learn your usage patterns before you see any improvements in battery life
My Tab S7 even with a 2.5 year old battery slays the battery life of my new S9. I routinely get an extra 2 hours of SOT. Your S8 must have a very worn battery to only be getting 6-8 hours. When new the 11" Tab S8 was capable of 12:52hrs of web browsing. The 11" Tab S9 is only capable of 8:06hrs of web browsing. That is almost a whopping 5 hours less SOT per charge and yet hardly anyone is mentioning this as being a problem?? Imagine when your S9 battery becomes as worn out as your S8 battery!
Samsung Galaxy Tab S8 review: A new standard for Android tablets
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You are comparing two different time periods. One is for 1 day 22h, the other is 6d 8 hours. How can you consider that an apples to apples comparison?1
Try running dark mode in everything. (it's probably the only thing that will help at this point).
One of the pro's about LCD's is they have relatively static power consumption for different content, and power consumption scales with just the brightness. OLED power consumption will scale with both color and brightness, and my guess is that web browsing and news have a lot of white space.
It's a shame that OLED's carry such a power penalty.1Just got the tablet yesterday and indeed the s9 is running around 1 watt extra at idle compared to s8 (1.2watt vs 2.3watt). Wifi and screen brightness (below 20%) doesn't have tangible effect on the power consumption. I checked the cpu core freq with the toolbox app on both device and noticed that s9 actually ramps up the prime core quite frequently, alow with the A715 cores up to 2ghz. The s8 when idle doesn't exhibit this behavior as much (using mostly the A510 instead of the prime and performance core). Samsung needs to update their CPU scheduler since the ramp up is unnecessary so say the least. Un the other hand. Standard by over night shows the s9 much better than the s8. Dropping only 1 % vs 4 % on the s8 when both are connected to wifi.1Another update, power consumption is more or less the same after a week of use, but screen on time feels a bit longer now with about 5 hours of browsing&YouTube going down by 45%. One weird thing to note is playing cod mobile for 30min only drops the battery by ~6% with 3 separate sessions, which is significantly better than s8 (~13-14%), meaning power consumption when gaming isn't significantly higher than browsing&streaming video1
Perhaps, accubat shows my S8's estimated battery capacity was around 7810mah before I trade it in. Again I remember tab s8's battery life got much better over time after launch so I wouldn't be too worried about battery getting worse as the OS scheduling gets optimized. The tab has very high idle draw rn so screen on time is pretty much the same no matter what I do.My Tab S7 even with a 2.5 year old battery slays the battery life of my new S9. I routinely get an extra 2 hours of SOT. Your S8 must have a very worn battery to only be getting 6-8 hours. When new the 11" Tab S8 was capable of 12:52hrs of web browsing. The 11" Tab S9 is only capable of 8:06hrs of web browsing. That is almost a whopping 5 hours less SOT per charge and yet hardly anyone is mentioning this as being a problem?? Imagine when your S9 battery becomes as worn out as your S8 battery!
Samsung Galaxy Tab S8 review: A new standard for Android tablets
This is what a premium Android tablet should be
www.tomsguide.com
Galaxy Tab S9 battery and charging
Here's what to expect in terms of battery for...www.phonearena.com
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2Remember that device is quite new, they still may improve battery with software update.1
I'm getting slightly better. Not a huge difference; and I wasn't expecting a huge difference.
Whatever is happening with yours is not common. Either you are doing something different, one or more of your apps is causing it, or worse case, defective battery with some dead cells. I have a feeling it is a combination of the first two.
If you truly want to figure it out. Do a factory reset, and don't install any of your apps. If battery life is improved, then reinstall your apps one at a time (not from a backup). Once you start noticing your battery life getting worse, then you have narrowed it down to an app or a set of apps.1
Wow! You were expecting that big of a difference? That is unrealistic, at best.
Here is what Phone Arena got, which is pretty much matches what you are getting. I'm getting about the same.
Samsung Galaxy Tab S9 Review: Tablet nirvana
The most compact Samsung tablet out there is...www.phonearena.com
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