Zenfone 9 battery degradation to 76% in less than two years

[akaoveve]

Zenfone 9, the model sold in Europe.

After less than 2 years of using this phone I have battery degradation to 76%.

I always used the very slow charging feature (10w equivalent charging) + limit to 80% using the original charger. Charged each night, as described.

What is your experience with Asus phones? 

[HazzJC · Accepted solution]

Hi,

I’ve encountered a similar issue. I bought my phone second-hand at around 90% battery health in November 2023, but by November 2024 it had dropped to 75%.

I use AccuBattery to keep track of my charging habits. Since purchasing the phone, I’ve fully charged it 279 times over the course of 541 days—roughly half a full charge per day, which isn’t too much wear imo. 

In December, I replaced the battery myself. It wasn’t too difficult, and I gained roughly an extra hour or two of screen-on time afterwards.

AccuBattery estimates an average yearly capacity loss of 14.8%, which I find quite alarming. I rely on scheduled overnight charging and usually top the phone up from about 20% to 80% before carrying on.

Overall, it hasn’t been a great experience, and I doubt I’d buy another one. It’s a shame that such a capable device is let down by the very feature that made it stand out for me in the first place. In hindsight, I wish I’d just saved up for an Xperia 5 V.

[akaoveve]

Ha! Sony? More like Sorry!

I used to have a Sony Xperia XZ2 Compact—a great phone in many ways, but the screen developed "ghost touches." Over time, they became so frequent that the phone became unusable—I couldn’t even reliably answer calls.

So, do you think the new Sony lineup you’re hoping for is any better? Nope! The newer models also experience ghost touches!! Google this! 

Sony devices also tend to be quite buggy, even up until the end of their support period.

The only phones I’ve found to be truly reliable in terms of hardware quality, thoughtfully chosen features, and a smooth, bug-free OS are Huawei and Honor. Their battery life is also unmatched in the Android world, thanks to an excellent power management system—not just by killing background apps, but by optimizing processor usage intelligently. You might wait an extra 300ms for a page to load, but in return, you get significantly longer battery life!

On top of that, Huawei and Honor phones offer incredible value for money, with all these advantages included.