JerryRigEverything finds doomscrolling robots in Oppo's battery lab
Zack Nelson's factory tour goes beyond assembly to show how phones are tested for battery life, reception and camera performance.
JerryRigEverything
Story of Why this story? 1,953,786 views so far, and here is what is inside it.
How to Build a Smartphone - Full Factory Tour
Things we can learn from the video
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- 0:40Robotic carts move circuit boards while automated machines populate the motherboards with tiny components.
- 4:53Clean-room technicians assemble screens, aluminum frames and internal parts before adding cameras, batteries and cabling.
- 8:58Completed phones undergo automated stress tests, including water resistance and simulated drops.
- 9:30Specialized chambers let engineers test the phones' 4G and 5G antenna signals.
- 11:55Robotic arms repeatedly scroll on phones to measure battery life in the Power Consumption Lab.
- 12:35Camera labs calibrate image performance and background-blur recognition against Hasselblad benchmarks.
A robotic arm keeps working through a phone screen, repeating an activity its eventual owner may know all too well. In Oppo's Power Consumption Lab, automated scrolling has a practical purpose: measuring battery life.
That is one of the more memorable stops in JerryRigEverything's "How to Build a Smartphone - Full Factory Tour," which has drawn nearly two million views. Oppo sponsored the visit, giving Zack Nelson access to the manufacturing and testing facilities behind its Find X10 Pro Max.
We covered the assembly line earlier, as we reported here, but the testing rooms deserve a closer look. Once screens, frames, cameras and batteries have come together, the phones face automated water-resistance and drop tests. Nelson then enters specialized chambers where engineers test antenna signals, including reception for 4G and 5G.
"Currently, I am locked in one of the most expensive rooms at this testing facility," he says inside the Microwave Lab.
Camera testing gets its own dedicated spaces. Technicians calibrate the cameras against Hasselblad benchmarks, with separate labs for lifelike images and recognizing the backgrounds that get blurred in portrait photography. The tour ends among design prototypes, colors and materials.
Viewers keep returning to the scrolling robots in the comments. Others pick up on the change of perspective: Nelson, so often seen taking phones apart, is following the work required to put them together and check that they function.
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What viewers say
doom scrolling robots are crazy
@opdragon8069See it on YouTubeFrom breaking smartphone to actually witnessing the manufacturing process, zack come a long way , 👏
@artinsoul2142See it on YouTube2:10 yeah whenever I see stuff like this, I realize how much we take for granted what incredible technology all this stuff is.
@RobbyHuangSee it on YouTube
4 more comments
for dudes having studied automation and manufacturing this is like a paradise video :)
@chrisd997See it on YouTubeMore companies invite this man to see how things are made please
@eyeDavidSee it on YouTubeBetter than a visit to the Wonka Factory!
@JimmySavileBBCSee it on YouTubeIt's refreshing to see the *actual* robots being using in factories, not the humanoid vaporware.
@MeOnStuffSee it on YouTube
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- Channel
- JerryRigEverything
- Subscribers
- 10,200,000 ▲ 100,000 this week
- Channel views, last 7 days
- 23,981,404
- Channel views, pace per day
- 5,110,156 (on a normal day: 2,182,061)
- Video published
- October 21, 2026
- Video views so far
- 1,953,786 (6 days online)
- Video views, pace per day
- 153,367 (on a normal day: 519,763)
The numbers
The factory tour's views sit alongside its likes and comments below.
💡 Test your knowledge
What are Oppo's scrolling robotic arms helping to measure?
The robotic arms operate phones in the Power Consumption Lab to measure battery life.