Asus Zenfone 9 battery test: mini body, Pro Max battery durability

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The Asus Zenfone 9 impresses with its compact size at a time when larger phones dominate the market, but it’s not only small, it’s also powerful, and Asus has made some big promises in terms of battery life. Does the Zenfone 9 live up to those battery claims and what is the battery life like in the real world?

We’ve been using the device for over a week and our impression is that this compact phone delivers on the battery’s promises. Asus tells us to expect a battery life of 1.9 days, an odd number, but one that we find pretty close to our actual usage.

The Zenfone 9 could easily keep us off the charger for a day and a half, and if we didn’t push it too much, it could last up to two full days between charges. This is the battery life of the iPhone 13 Pro Max in a small size of 5.9 inches. Impressive!

PhoneArena YouTube Video Streaming Battery Test

We also ran our independent battery tests on the Zenfone 9. Before running these tests, we set all devices to the same brightness level to ensure a level playing field. In our YouTube test, Zenfone 9 scored higher than we thought possible for such a small phone and handily beat the competition.

PhoneArena Web Browsing Battery Test

Our lighter web browser test is done over a Wi-Fi connection as a script browses websites and the phone scrolls around at a steady pace. This is a great simulation of real life use and Zenfone 9 scored a whopping 17 hours and 13 minutes, the best ever score for a compact phone.

PhoneArena 3D Gaming Battery Test

Finally, we have our 3D gaming test where we play a popular game on medium settings until the phone dies, and the Zenfone once again outperformed its rivals with 8 hours of battery life. However, we noticed that with higher graphics settings the phone would slow down a bit faster than larger phones, but that’s probably to be expected.

Does the Asus Zenfone 9 have good battery life?

The short answer is “yes”. Despite its mini size, the Zenfone 9 pulls some incredible battery numbers that we haven’t seen in a modern small phone until now. With average use, the Zenfone 9 could even last two full days off the charger, a feat that rivals the phones with the best battery life in the industry, such as the much larger iPhone 13 Pro Max.

How much battery does the Asus Zenfone 9 have?

The Zenfone 9 has a 4,300 mAh battery cell inside. This is a lot of battery for a 5.9-inch phone! In comparison, the 6.1-inch Galaxy S22 only has a 3,700mAh battery cell, and the Zenfone even comes with a headphone jack that many companies have ditched to allegedly make more room for a battery! Well, Asus certainly proves that you don’t have to remove it to have a big battery in your phone!

Does the Zenfone 9 have wireless charging?

No. The Zenfone 9 does not support wireless charging.

Does the Zenfone 9 have reverse wireless charging?

Again, no. You cannot use Zenfone 9 for reverse wireless charging.

What charger does the Asus Zenfone 9 use?

It comes with a 30W Asus charger in the box. The charger is black and uses a USB-C connection.

We measured a 0-100% full charge on the Zenfone 9, with this charger taking about 1 hour and 15 minutes.

How fast does the Asus Zenfone 9 charge?

The Zenfone 9 reaches its maximum charging speeds of 30W. Even if you have a faster charger, you can’t get faster charging speeds on the Zenfone 9.

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