"Never use fast charging—it ruins your battery!"

"Keep your phone's battery between 30% and 80% at all times!"
"A degraded battery will slow down your phone!"

These so-called "common sense" rules about phone charging and battery maintenance have almost become commandments for every smartphone user. But are they scientific truths, or just online myths? Recently, YouTube channel HTX Studio conducted a rigorous experiment that spanned nearly six months and involved dozens of phones, using real data to provide the answers.

Today, as Longhehui, a brand deeply rooted in the battery industry, we will take you through an in-depth analysis of this experiment and explore the battery issues that truly matter beyond the lab.

HTX's experimental design was highly meticulous. They divided multiple iPhone and Android devices into fast-charging groups, slow-charging groups, 30%-80% cycling groups, and control groups. Through automated testing, these devices underwent 500 charge cycles (simulating about 1.5 years of use), with precise records of battery capacity degradation.

Myth #1: Is Fast Charging the #1 Battery Killer?
The Truth: The impact is negligible.

• What the data shows: After 500 cycles, the battery degradation in the iPhone fast-charging group was only 0.5% higher than the slow-charging group. In the Android camp, the fast-charging group even showed 0.3% less degradation than the slow-charging group.

• Longhehui's Analysis: This finding completely overturns conventional wisdom. It proves that modern battery management chips and intelligent charging protocols are highly advanced. During charging, the phone "communicates" with the charger to adjust power output in real-time based on battery status and temperature, ensuring both high-speed charging and maximum battery protection. So, feel free to use your fast charger—technology is meant to serve people, not cause anxiety.

Myth #2: Is the 30%-80% Rule a Must-Follow "Golden Rule"?
The Truth: It helps, but don’t let it control your life.

• What the data shows: Compared to the 0%-100% full-cycle groups, the phones maintained between 30% and 80% charge showed significantly better battery health. For iPhones, this group had about 8% less degradation than the full-cycle group.

• Longhehui's Analysis: From an electrochemical perspective, avoiding extreme high (100%) or low (0%) charge states does reduce stress on the battery and extend its lifespan. The data supports this. However, the key is moderation. For most users, sacrificing convenience to strictly adhere to this range is unnecessary. Instead, treat it as an "optimization tip" rather than a "strict rule." For example, enable "Optimized Battery Charging" overnight, or unplug the charger when you don’t need a full charge.

Myth #3: Will Storing a Fully Charged Battery Permanently Damage It?
The Truth: Short-term is fine, long-term requires caution.

HTX’s supplementary experiment found that storing phones at different charge levels for one week resulted in almost no change in battery capacity.

• Longhehui's Analysis: Battery degradation is a long-term chemical aging process, not an instant one. Occasionally storing a fully charged phone is nothing to worry about. However, if you plan to store a phone for several months, the official recommendation is to keep it at around 50% charge in a cool, dry place. This is the best practice for long-term storage.

While HTX’s experiment answers "how to charge," as battery experts, we believe the following issues are more relevant to your daily experience.

1. Does a Degraded Battery Really Slow Down Your Phone?

HTX’s experiment included a key test: comparing the performance of phones with different battery health levels. The results showed that even when battery health dropped to 81%, the phones’ benchmark performance remained almost unchanged.

• Longhehui’s In-Depth Analysis: Then why do our phones feel slower? The real reason is the "throttling" strategy implemented by the system to protect user experience. When a battery is severely degraded (usually below 80% health), its internal resistance increases, making it unable to deliver stable peak voltage during high-demand tasks (like gaming or recording video). To prevent sudden shutdowns due to insufficient voltage, the system proactively reduces processor performance, leading to "lag." So, battery degradation is the "cause," and performance loss is the "effect," but they are not directly equivalent.

2. When Is It Really Time to Replace Your Battery?

HTX's experiments provide a clear metric: when battery health drops to around 85%, you'll start to notice a significant reduction in battery life. When battery health drops to 80% or lower, the difference in battery life becomes very significant, severely impacting daily use.

• Longhehui’s Replacement Guidelines:

  • Battery Anxiety: A full charge can’t last through half a day of normal use.

  • Performance Lag: Noticeable and unusual stuttering when opening apps or gaming.

  • Unexpected Shutdowns: The phone turns off even when the battery shows 20%-30%.

If you experience these issues, it means your phone’s battery has served its purpose, and it’s time for a "rejuvenation."

Reflecting on HTX’s experiment, the core message isn’t to provide a rigid "best charging manual" but to convey a principle: Modern phone batteries are durable consumables, and technology has already overcome most usage barriers.

The best charging mindset is: Charge as needed, prioritize convenience. Don’t let battery anxiety dictate your actions. Topping up your phone during downtime—at the office, in the car, or by your bedside—is the healthiest and most stress-free approach.

And when that day comes, when your trusted companion starts struggling due to an aging battery, remember that Longhehui is always here. We are committed to providing high-capacity, safe, and long-lasting professional replacement batteries. Let our expertise breathe new life into your device, allowing it to continue exploring the world’s wonders with you.

Let’s Discuss: What’s your phone’s current battery health? Have you started feeling the battery anxiety? Share your thoughts in the comments below!
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