Core Viewpoint - The recent issues surrounding power banks highlight the broader concern regarding the finite lifespan of lithium-ion batteries, which are consumables despite their widespread use [3][8]. Group 1: Quality Issues and Supply Chain - A major cause of the recent power bank quality problems was a battery cell manufacturing factory that violated regulations by replacing the separator material between the positive and negative electrodes, leading to substandard quality [4]. - Power banks using these faulty battery cells entered the market around early 2024, resulting in overheating, swelling, and even fire incidents, prompting recalls and bans [5]. Group 2: Battery Lifespan and Chemistry - Lithium-ion batteries, including power banks, have a limited lifespan due to the inherent chemical reactions that occur during charging and discharging cycles [11][20]. - The phenomenon of lithium plating, known as "lithium dendrite" formation, poses a significant risk as it can lead to short circuits and potential fires [15][17]. Group 3: Maintenance and Safety Precautions - Proper maintenance can extend the usable life of lithium batteries, but all batteries will eventually degrade, typically after 300 to 500 charge cycles, equating to about two to three years of average use [21][22]. - Users should be vigilant about physical changes in batteries, such as swelling or leakage, and should seek professional help for disposal to prevent fire hazards [26][31].

Core Viewpoint - The article discusses the correct practices for charging mobile phones, debunking outdated myths and providing updated guidelines for optimal battery maintenance and longevity [2][4]. Charging Practices - It is a misconception that mobile phones should be fully charged and fully discharged. Modern lithium-ion batteries do not suffer from memory effect like older nickel-cadmium batteries, allowing for more flexible charging habits [2][4]. - The lifespan of lithium-ion batteries is closely related to charging cycles. Each complete discharge and recharge counts as one cycle, and deep discharges can damage the battery structure, leading to reduced capacity. Therefore, "multiple small charges" are recommended [4]. Charging Sequence - The correct sequence for charging is to plug the charger into the power source first, then connect the data cable to the phone. This prevents potential surge voltage that could damage the phone [6]. Disconnecting Devices - When disconnecting after charging, it is advisable to unplug the phone first before removing the charger. This helps avoid reverse current that can accelerate battery aging [9]. Power Banks - Many power banks claim high capacities (e.g., 20,000 mAh), but the actual usable capacity is lower due to energy loss during conversion. Users should check the rated capacity in the manual for accurate information [10][13]. - Similar to mobile phones, power banks also use lithium-ion batteries and are affected by charging cycles. The same "multiple small charges" practice is recommended for them [13]. Charging Equipment - There is a belief that using mismatched chargers can cause battery damage. However, most chargers have smart chips that adjust the output to match the device's requirements [15]. - Playing games while charging can lead to increased temperatures, which negatively impacts battery lifespan. It is also advised to avoid thick phone cases that can trap heat [15].