『New Posts』★★★★★

Why Batteries Hate Being Fully Charged

Why Batteries Hate Being Fully Charged

Charging your device to 100% feels safe and complete. For most people, full charge means peace of mind.

However, from the perspective of a lithium-ion battery, 100% is the most uncomfortable state.

Illustration showing internal stress inside a fully charged lithium-ion battery

What Happens Inside a Battery at 100%

Lithium-ion batteries store energy through chemical reactions. When the battery reaches full charge, internal voltage peaks.

This high voltage creates continuous pressure on the battery’s internal structure. While this stress is invisible, it slowly accelerates chemical degradation.

In simple terms, the battery is being forced to stay fully stretched. And stretched systems wear out faster.

Why Full Charge Feels Safe but Isn’t

Manufacturers design batteries to tolerate full charge safely. That does not mean it is the most comfortable condition.

Safety and longevity are not the same thing. A battery can be safe at 100%, yet still age faster.

The Other Extreme Is Also Harmful

Just as full charge creates stress, complete discharge does the same. Letting the battery drop to 0% repeatedly increases wear.

Lithium-ion batteries dislike extremes on both ends.

The Most Battery-Friendly Zone

The most stable charge range is between 20% and 80%.

In this zone, internal chemical reactions are calmer. Voltage stress is reduced, and long-term capacity is preserved.

What This Means for Daily Use

You do not need to avoid 100% forever. What matters is how long the battery stays there.

• Avoid keeping devices fully charged for many hours • Unplug once charging is complete when possible • Short, partial charges are healthier than long full charges

Key Takeaway

A full battery feels reassuring to humans. For batteries, moderation is far more comfortable.

Longevity comes from balance, not extremes.

コメント

コメントを投稿

閲覧数が多い記事 |Articles with many views

Why Small Tasks Feel Harder Than Big Ones

イメージ
Why Small Tasks Feel Harder Than Big Ones Replying to one message. Filing one document. Cleaning one corner of the room. These tasks look easy — yet they feel strangely heavy. Meanwhile, big projects sometimes feel easier to start. This is not laziness. It’s how the brain handles effort and clarity. 1. Small Tasks Have Unclear Endings Big tasks usually have a clear structure: start, progress, finish. Small tasks often feel endless. Reply one email, and five more appear. The brain dislikes vague effort. Unclear endings increase mental resistance. 2. Decision Cost Is Higher Than Effort Cost Small tasks require constant decisions: When should I do this? How exactly should I respond? Is now the right time? This decision-making drains more energy than the task itself. 3. Context Switching Is Mentally Expensive Switching between tiny tasks forces the brain to reset repeatedly. Each reset consumes cognitive energy. That’...
続きを読む read more≫

Why We Keep Checking Our Phones Without Any Notification

イメージ
Why We Keep Checking Our Phones Without Any Notification You pick up your phone. There’s no message. No alert. Nothing new. Yet somehow, you checked it anyway. This behavior isn’t accidental. It’s a learned response built into modern life. Your Brain Is Chasing Possibility Each time you receive a notification, your brain releases a small amount of dopamine. Not because the message is good— but because it might be. Uncertainty is more addictive than reward itself. Over time, the brain stops waiting for notifications. It starts checking just in case . The Habit Loop This creates a simple loop: Boredom → Phone Check → No Reward → Try Again The loop doesn’t need success every time. Occasional reward is enough to keep it alive. Why This Feels Exhausting Each check costs attention. Even without noticing, your brain constantly resets focus. That’s why phone fatigue feels real— even when you “did nothing.” T...
続きを読む read more≫

Why We Feel Tired After Doing Nothing

イメージ
Why We Feel Tired After Doing Nothing You didn’t exercise. You didn’t work hard. Yet somehow, you feel exhausted. This kind of tiredness is real—and it’s not physical. Mental Fatigue Is Not Rest The brain consumes energy constantly. Scrolling, switching apps, watching videos, and reacting to notifications all require attention. Resting your body does not always rest your brain. Attention Is Expensive Each small decision— what to watch, what to read, what to ignore— uses cognitive resources. Even passive activities can overload the brain when they require constant micro-choices. This leads to mental fatigue without movement. Why It Feels Worse Than Physical Tiredness Physical fatigue has clear signals. Mental fatigue is subtle. It builds quietly and lingers longer. That’s why “doing nothing” can feel more exhausting than activity. The Takeaway Feeling tired doesn’t always mean you need sleep. Someti...
続きを読む read more≫

Why Time Feels Faster as We Get Older

イメージ
Why Time Feels Faster as We Get Older Many people say the same thing as they age: “Time feels like it’s speeding up.” Days blur together. Years seem shorter. This feeling is not imagination or nostalgia. It is a well-documented psychological effect rooted in how our brain processes time. 1. Time Is Measured by Memory, Not Clocks The brain does not measure time like a stopwatch. It measures time by how many memories are created. When we experience something new, the brain records more details. More details create the feeling of a longer day. As we age, daily life becomes more predictable. Fewer new memories are formed, so time feels compressed. 2. Routine Shrinks Our Sense of Time Repeating similar days sends a signal to the brain: “Nothing new happened.” When the brain does not need to store new information, it speeds up processing. This makes weeks and months feel shorter in hindsight. 3. Childhood Had More “First Times” Think abou...
続きを読む read more≫