The Effects of Slow vs. Fast Charging on Smartphone Batteries
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Generally speaking, slow charging is more beneficial than fast charging for battery health. Fast charging subjects the battery to higher currents, which leads to increased stress on its components. It also generates more heat, and heat is known to accelerate battery degradation. These facts are widely recognized, but a recent video by YouTuber HTX Studio raises a critical question: What is the actual impact of fast charging on the lifespan of batteries in iPhones and Android smartphones?
To conduct this experiment, the YouTuber devised a highly controlled setup. He used six iPhone 12s, three of which were charged quickly and three charged slowly, to see if there was any notable difference at the end of the experiment. He created an app designed to drain the battery as quickly as possible and linked it to a smart plug that would start charging the phone at 5% battery life and stop once it reached 100%. The process was repeated until the batteries had gone through 500 full charge cycles.
The experiment took six months to complete, and the results were quite conclusive. After 500 charge cycles, the batteries of the iPhones charged slowly had degraded by 11.8%, while those charged quickly had degraded by 12.3%—a mere 0.5% difference. This negligible difference suggests that in practical terms, there is no significant impact on battery life between the two charging methods. If you need to use fast charging, there’s no reason to avoid it out of fear of significantly harming your battery’s lifespan.
The same test was performed with Android smartphones, yielding similar results. The YouTuber also explored another theory by only doing half charge cycles: charging the phone from 30% to 80% battery life each time. Using only 50% of the battery’s total capacity did indeed limit degradation more effectively, with only 8.3% degradation after 500 full cycles, which is 4 points less than using the full capacity, though at the cost of halving the phone’s battery life.
The video’s message, which is well worth watching for its concise and clear presentation, is straightforward: charge your iPhone or Android device however you like, as meticulous care for the battery isn’t necessary. Even with careful charging, battery degradation is inevitable, and the difference between slow and fast charging is so minor that it doesn’t justify extra hassle. Ultimately, charging quickly will not destroy your battery rapidly, nor will slow charging prevent eventual degradation. After several hundred cycles, a battery replacement might be necessary regardless of your charging habits.
Although the video does not specifically address it, one can assume that results would be similar if wireless charging were included in these tests. While wireless charging generates more heat, which is detrimental to battery health, it likely doesn’t make a significant difference compared to what is often suggested.
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Ava Blake is passionate about social media platforms and how they influence modern tech culture. She reviews apps, trends, and the evolving digital lifestyle for Touch Reviews readers.
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