Prática de Shadowing: Is Fast Charging Killing the Battery? A 2-Year Test on 40 Phones - Aprenda a falar inglês com vídeo
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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.
Contexto e Fundo
O vídeo explora um experimento de dois anos com 40 celulares para responder se a carga rápida danifica a bateria. Ao longo do diálogo, o narrador usa uma linguagem clara e prática, ideal para quem quer aprender inglês com vídeos, combinando explicações técnicas com dicas cotidianas. Essa mistura de conteúdo informativo e conversacional torna o material perfeito para prática de conversação em inglês, especialmente com a técnica de shadow speak.
Top 5 Frases para Comunicação Diária
- “Does fast charging actually damage your battery?” (A carga rápida realmente danifica a bateria?)
- “What’s really the best way to charge your phone?” (Qual é realmente a melhor forma de carregar o celular?)
- “Time flies.” (O tempo voa.)
- “The results are completely independent.” (Os resultados são completamente independentes.)
- “Don’t overthink it.” (Não se preocupe demais.)
Guia Passo a Passo para Shadowing
Para praticar shadow speech com esse vídeo, siga estes passos: 1) Escute um trecho curto (30 segundos) e repita imediatamente, copiando a entonação e o ritmo. 2) Foque nas frases técnicas, como “battery capacity” (capacidade da bateria) ou “charge cycles” (ciclos de carga), para aprimorar o vocabulário técnico. 3) Repita trechos com perguntas, como “And at what point should you actually consider replacing your battery?”, para treinar a fluidez na fala interrogativa. 4) Grave sua voz e compare com o original para ajustar a pronúncia. 5) Pratique diariamente por 10 minutos, escolhendo trechos diferentes cada vez. Essa técnica ajuda a melhorar a fluência e a compreensão oral de forma eficaz.
O que é a Técnica de Shadowing?
Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.