모바일 배터리를 항상 플러그에 꽂아 둘 수 있나요? Posted by batterymanufactory.com

3월 07, 2025

Power banks have long become a "life-saving artifact" for modern people to travel, but many people have misunderstandings about their use: some people are used to plugging them in as backup power, some people leave them idle for a long time after they are fully charged, and some people even treat power banks as "permanent plug-in devices." Are these behaviors really safe? Will long-term plugging in damage the power bank? This article will analyze the plug-in risks of power banks based on the principle of lithium batteries and provide a scientific maintenance guide.

파워뱅크

I. The core of power banks: the two sides of lithium batteries

Power banks generally use lithium-ion batteries or lithium polymer batteries, and their characteristics determine the taboos of use:

a. Fear of overcharging and over-discharging: long-term storage with full or empty power will accelerate aging.

b. High temperature is an invisible killer: continuous plugging in may cause internal circuits to heat up.

c. Self-discharge is inevitable: even if not used, 1%-5% of the power will be naturally lost every month.

Key conclusion: The original intention of the power bank design was "mobile power supply" rather than a long-term plug-in device.

II. Four major risks of always plugging in

1. Overcharge protection is not absolutely reliable

Original power bank: Most of them have overcharge protection and automatically cut off the power after full charge.
Poor quality power bank: The circuit design is simple, and it may continue to "trickle charge", causing the battery to overvoltage and bulge.
Laboratory data: A third-party test showed that among 10 low-priced power banks, 3 continued to charge with a micro-current after being fully charged, and the battery temperature increased by 8°C-12°C.

2. High-voltage static accelerated aging

Maintaining 100% power for a long time will aggravate the decomposition of the electrolyte, and the capacity decay rate is 3-5 times that of 50% power storage (data source: Battery University).

3. Circuit components continue to heat up

Even if charging is stopped, the buck/boost module of the power bank in the plugged-in state may still work, causing component aging or even short circuit.

4. Safety hazards

Long-term plugging in + high temperature environment (such as in a car with direct sunlight) may cause thermal runaway, and in extreme cases, cause combustion.

III. Scientific use guide: balance convenience and safety

✅ Correct approach

a. Charge as you use and power off in time

Unplug the power bank when it is charged to 80%-90% to avoid long-term full charge.
If you need to plug in for a long time (such as emergency standby), choose a smart power bank that supports automatic power off function (such as Anker PowerCore Reserve).

b. Activate the battery regularly

Use it at least once a month to complete a 20%-80% charge and discharge cycle to prevent battery "passivation".

c. Keep half the power before storage

When not in use for a long time, charge it to 50%-60% and then turn it off and store it away from high temperature and humid environment.

❌ Avoid behavior

Treat the power bank as a "permanent plug-in device" (such as plugging it into the socket as a fixed charger for mobile phones).
Long-term idleness (more than 3 months) in a fully charged state.
Use while charging (charging the power bank and powering the mobile phone at the same time), which will increase the circuit load.

IV. Ultimate advice: safety is more important than convenience

The essence of a power bank is an "energy carrier" rather than an "energy storage device". For safety and life, please follow the following principles:

a. Do not overcharge: unplug the battery when it is fully charged, and avoid long-term plugging.

b. Do not store it at high temperatures: keep it away from heat sources and avoid storing it in the car in summer.

c. Do not be greedy for cheapness: choose well-known brands and refuse products without any warranty.

Remember: The battery health of a power bank directly affects safety. If you find that the battery life is sharply reduced, abnormal heating or deformation of the appearance is found, please replace it immediately!

March 7, 2025 | Categories: Benzo 리튬 배터리 뉴스, 리튬 배터리 지식 | By: Benzo Energy

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