シャドーイング練習: Is Fast Charging Killing the Battery? A 2-Year Test on 40 Phones - 動画で英語スピーキングを学ぶ
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If you bought a phone charger recently, it probably supports fast charging.
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And you probably still have some slow chargers lying around.
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I've heard people say that when you charge overnight, you should use the slow charger.
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Because fast charging supposedly hurts the battery more.
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There's also a saying that keeping your battery between 30 and 80% is the healthiest range.
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So, does fast charging actually damage your battery?
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What's really the best way to charge your phone?
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Does battery wear make your phone slower?
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And at what point should you actually consider replacing your battery?
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Today, let's run an experiment to find out the answers.
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First, we prepared 6 iPhone 12s and divided them into a fast charge group and a slow charge group.
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Then we opened them up and measured the battery capacity of each one, and installed our custom software called the Discharge Loop.
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Once the app starts, the phone begins running a program to drain its battery.
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When the battery drops to 5%, the app sends a signal to a relay connected to the charger, telling it to close the circuit and starts charging.
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Once the phone reaches 100%, the app tells the switch to open again and stop charging, then starts draining the battery again, repeating the cycle endlessly.
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Since each cycle charges and discharges about 95% of the capacity, we count that as 0.95% of a full cycle.
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After 500 cycles, we open the phones again and re-measure their battery capacities.
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If the fast charge group shows significantly more capacity loss than the slow charge group, then we can say fast charging does hurt the battery more.
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In addition, we prepare another group of iPhone 12s.
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These phones stream from 80% down to 30%, then fast charge back to 80%, Since each round only uses 50% of the battery, we count that as a half a cycle.
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If after 500 cycles, this group's battery loss is less than the full fast charge group,
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then it proves that keeping your phone between 30% and 80% really does help protect the battery.
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Finally, we had one more iPhone 12 as a control group.
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This phone didn't go through any charge cycles, we only measured its capacity at the beginning and end, to rule out the effects of time and other factors.
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On Android, we set up the same test groups, but for fast charging, we used the IQ7 with 120W, and for slow charging, we used 18W.
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To keep the experiment running smoothly, we built an anti-crash device.
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If our discharge app crashes, this device detects the screen color change and reopens the app automatically.
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All the phones used in this experiment were purchased through official stores.
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We didn't communicate with any brands, so the results are completely independent.
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Running a test like this takes about 6 months, so if you could give us a like, we'd really appreciate it.
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Before the test began, just to prove we were really doing this for a long time, we planted some plants.
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Time flies.
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The plans didn't survive, but the experiment did.
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After 167 days, all the phones had completed 500 charge cycles.
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The iPhone's slow charge group lost 11.8% of its battery capacity.
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The fast charge group lost 12.3%, just 0.5% more.
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On Android, the slow charge group dropped 8.8%, while the fast charge group dropped 8.5%, about 3.3% less.
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So over 500 cycles, roughly a year and a half of use.
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That difference is almost unnoticeable.
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In addition, the iPhone 50% fast charge group lost 4% less capacity than the full fast charge group.
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The Android 50% fast charge group lost 2.5% less.
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So keeping your phone's battery between 30% and 80% does help reduce wear, but the improvement is limited.
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There's also a common belief that leaving your phone plugged at 100% is bad for the battery.
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That idea actually makes sense.
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Apple even says, if you store it fully charged for an extended period of time, the battery may lose some capacity.
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To test this, we took 6 iPhone 12s, measured their capacities, and split them into 3 groups.
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One left at 1%, one at 50%, and one at 100% when plugged in.
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Then we puffed them off and left them for the week.
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Guess what, their battery capacities didn't change at all.
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So battery aging is a long-term process.
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The best way to charge your phone is simply however you like.
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Don't overthink it.
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Don't trade mental energy for a tiny bit of battery life.
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Now that we know how charging affects battery wear, let's look at how battery wear affects your actual phone experience.
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We found four iPhone 12s with battery health at 94, 89, 85, 81%, plus one iPhone X at 77%.
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We teamed up with our friends, our geekier one, to test their battery life and performance.
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After four hours of continuous use, The remaining battery levels were 39, 41, 32, and 26%.
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The iPhone X at 77% battery health shut down after 3 hours and 52 minutes, then replaced all their batteries and run the test again.
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This time, the remaining power increased by 6, 5, 12, and 16% and 24%.
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So once your battery health drops to around 85%, you'll start noticing shorter battery life.
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When it falls near 80%, it's time to replace the battery.
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Android doesn't show official battery health numbers at the time.
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But we tested three Android phones from our experiment.
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Before the experiment, their remaining power after the same test were 35, 33, and 35%.
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After new batteries increased 9, 10, and 8%, roughly an extra 90 minutes of use.
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Does battery wear affect performance?
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Not really.
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Performance stayed nearly the same before and after replacement.
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But phones with degraded batteries throttle earlier.
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For example, this iPhone with 80% battery health slows down at 11%.
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But with the new battery, it doesn't throttle until 5%.
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In games, that means the new battery lets you play a bit longer before it lags.
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That's the end of our experiment section.
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Some of you might be wondering, if you only use 20 phones and 6 months, why does the title say 40 phones, 2 years?
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That's because we tried this 3 times.
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The first one was back in October 2020 with just 4 phones, too fast, too slow.
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Back then, I didn't know how to automate anything.
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So I literally drained the batteries by leaving games running, charged them manually, then repeated them for months.
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From October 4th to March 3rd, I completed 330 cycles, but one fast-charge phone aged a lot.
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The other didn't at all, no clear results.
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So I tried again.
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This time, I bought four more phones for each group, added Android, and used a robotic arm and smart plugs to automate the whole process.
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From May 31st to August 3rd, 2021, I ran over 200 cycles, but four phones broke, and the software kept crashing, another failure.
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Then came the third try, the one you just watched, and it finally worked.
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Sometimes I wonder, does anyone still care about whether fast charging hurts battery?
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Is it really worth all this time and effort?
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Then I remember my first phone.
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I always waited until it dropped below 20% before charging, and only unplugged at 100% because I thought that was good for the battery.
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I did that for three years.
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Looking back, it didn't help the the phone, but it made me feel like I was taking care of something important, because that phone meant a lot to me.
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It was my window to the world, my escape from the boredom.
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So even if that kind of care didn't matter technically, it still mattered emotionally.
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If this video helps more people use their phones a little more freely, then it's all worth it.
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All the phones from this test have been given away to our viewers after getting brand new batteries.
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If there's anything else you'd like to have to test, let us know in the comments.
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this, we've also done a video about whether using your phone while charging hurts the battery.
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Go check it out.
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See you next time.
動画の背景と学習のポイント
この動画では、スマホの急速充電がバッテリーに与える影響について2年にわたる実験結果を説明しています。科学的な実験データをもとに、バッテリーの健康管理や充電方法に関する一般的な誤解を解き明かしています。英語学習者にとっては、技術的な用語や論理的な説明が多いため、リスニングとスピーキングの両方を鍛えるのに最適な素材です。
日常会話に使える5つのフレーズ
- "Does battery wear make your phone slower?"（バッテリーの劣化でスマホが遅くなりますか？）- 疑問を投げかける際の基本的な構文。
- "What's really the best way to charge your phone?"（本当に最適な充電方法は何ですか？）- 日常的なトピックで意見を求めるときに使えます。
- "Time flies."（時が経つのは早いですね。）- 時間の経過を表す口語的な表現。
- "Don't overthink it."（考え過ぎないでください。）- 相手を安心させるときのフレーズ。
- "Is it really worth all this time and effort?"（本当にこれだけの時間と労力が価値があるのですか？）- 行動の合理性を問う際の表現。
英語シャドーイングのステップバイステップガイド
この動画を使ったshadowing practiceは、以下のように行います。まず、動画を1分ずつ再生し、内容を理解しながら発音とイントネーションに注意します。次に、同じ部分を繰り返し聞き、1秒遅れで発声する"shadow speech"を行います。技術用語が多いので、難しい単語は事前に辞書で調べておきましょう。特に"battery capacity"（バッテリー容量）や"charge cycle"（充電サイクル）などのフレーズは頻出するので、慣れておきます。最後に、動画を見ながら自分で話す練習をし、自然なスピードとリズムを身につけます。動画で英語学習をする際は、繰り返し練習することが重要です。shadowing siteを利用して、効率的に練習することもおすすめです。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。