The biggest factor affecting the lifespan of a power bank is the battery cell. The battery cells on the market are generally divided into 18650 lithium cells and polymer lithium cells, while most sharing power banks use polymer lithium cells.
Like mobile phones, power banks also use lithium batteries, and when the battery level is low, the activity of the lithium battery will decrease. Often, the battery will be completely depleted, and its capacity will decay. So it's best to charge the power bank before it has the last grid left.
The service life of a battery cell is usually 300-500 cycles (one cycle from use up to full charge). Taking a power bank with a capacity of 10000 mah as an example, based on the 300 charge and discharge standards and an average frequency of 3 days of charging, it can be used for 900 days, less than 3 years.
Under normal use, if a brand new imported lithium battery is used 1-2 times a day, after one year of use, its battery capacity will decrease to about 80% of the original. If it is a regular lithium battery, the battery capacity will decrease significantly after one year of use.
Of course, in addition to charging, the power bank also fears the cold and heat. The working temperature of lithium batteries is 0-55 ° C, and when the external temperature is too low, it will make the battery unstable and discharge insufficient. High temperatures can shorten the lifespan of batteries and circuit boards, damage batteries, and cause certain components to age.
Therefore, the best warranty period for a qualified public shared power bank is six months, as the service life of the power bank will be greatly shortened due to factors such as charging, usage, and environment. In order to reduce unnecessary safety hazards, it is particularly important to replace the power bank in the shared cabinet every six months.