HORRIBLE battery life - new battery, factory reset, etc. What gives?

[mysticalice]

Hi -
Bought a S9+ back in August 2018. Was overjoyed with the battery life - I could go almost two days without charging it.

Fast forward to a few months ago, and it's been getting exponentially worse.

As I type this, at 12:00PM, my battery is at 52%, and I only started using it a few hours ago.

I go to the 'battery usage' screen. 4 hr and 17 min ago I took it off charge. Android System 12%. Screen has been on 1 hr 16 min (8%), WhatsApp for 12 min (6%), Voice calls 1 hr 7 min (5%), Instagram 12 min (2%), and the rest of the items are <2%.

I am not using the phone any more than I did back when I got it. I've done several factory resets, and a few weeks ago even took the phone to get the S9+ battery replaced.

I am OCD about factory resets, and always ensure I have the exact same applications running (with the icons in the same place, etc). Not to mention if it were an application draining the battery you would think I would see it in the android battery usage menu.

While typing this message on my computer, with my phone sitting in front of me with the screen on (adaptive brightness it enabled, and brightness is currently ~1/3), and the battery dropped 52% to 50%. Just with the screen on for 5 minutes.

I am not even a true 'power user' of the phone, definitely not more than most teenagers out there are. I occasionally look at Instagram, periodically use the browser, but most of the time it's WhatsApp, text messages, and phone calls.

Most frustrating is that I can't even figure out WHY it's draining this quickly. I can't blame it on an old battery, as I got the new one 6 weeks ago, and didn't notice any difference.

Open to ideas. I've gone through the 'background apps', 'dynamic wallpapers', etc. Nothing gives.

 

[mustang7757]

Need to see some battery stats

 

[mysticalice]

Hi -
I signed up.

Attaching battery stat pictures

 

[Rukbat]

1. Install GSam Battery Monitor, let it run for a day, then let us know what the Phone Radio usage was. (If your carrier moved an antenna, your coverage could be worse, causing the phone to raise the radio transmit power, costing you battery.)

2. How far do you normally allow the battery to drop before recharging? (Lithium batteries aren't deep discharge batteries. Letting them drop below 40% will shorten the lifetime of the battery. Letting it drop to near 0 every time can kill the battery completely in a couple of months. A good charge cycle is 45%-99%. [99% so that if the charger chip ever malfunctions, the battery won't overcharge and be ruined.])

 

[mysticalice]

1. Install GSam Battery Monitor, let it run for a day, then let us know what the Phone Radio usage was. (If your carrier moved an antenna, your coverage could be worse, causing the phone to raise the radio transmit power, costing you battery.)

2. How far do you normally allow the battery to drop before recharging? (Lithium batteries aren't deep discharge batteries. Letting them drop below 40% will shorten the lifetime of the battery. Letting it drop to near 0 every time can kill the battery completely in a couple of months. A good charge cycle is 45%-99%. [99% so that if the charger chip ever malfunctions, the battery won't overcharge and be ruined.])

Thank you for the response -
I have installed the GSam Battery Monitor. Will let it run for a full day (tomorrow).

I find myself charging the battery every time i'm in the car, at my desk, etc. What was most surprising was that even after a NEW BATTERY being installed, I still didn't notice any difference in battery life at all. Not noticeably at least, and certainly not the way it used to be when I first got the phone.

I'm also the type to plug the phone in (especially at night) and forget about it. My reasoning is if I have to be sure to unplug it before it gets to 100% at the minor risk of overcharging it, then it's just not worth it for me. $30 power drills have overcharge protection, so my $999 phone should too. Same principle for pumping gas into my car - I rely on the pump stopping when it gets full instead of overflowing.

 

[mysticalice]

1. Install GSam Battery Monitor, let it run for a day, then let us know what the Phone Radio usage was. (If your carrier moved an antenna, your coverage could be worse, causing the phone to raise the radio transmit power, costing you battery.)

2. How far do you normally allow the battery to drop before recharging? (Lithium batteries aren't deep discharge batteries. Letting them drop below 40% will shorten the lifetime of the battery. Letting it drop to near 0 every time can kill the battery completely in a couple of months. A good charge cycle is 45%-99%. [99% so that if the charger chip ever malfunctions, the battery won't overcharge and be ruined.])

FYI - Results from GSam Battery Monitor... Didn't even get to run a full day before I was <20%.
Screenshots below, of both the GSam screenshots, as well as the battery app (breakdown of the apps, as GSam doesn't appear able to give granular usage by app)