Charge cycles
The number of charge cycles that the battery can withstand without noticeable deterioration in performance.
The charge cycle refers to the period of time from one complete discharge of the battery to another, when the battery is first fully charged and then discharged to zero. In practice, this method of operation is relatively rare - much more often the batteries are charged under-discharged, and sometimes the process has to be stopped before the charge is replenished to 100%. In addition, the number of charge cycles is usually indicated for ideal operating conditions: a “native” charger, a relatively low load during operation, compliance of the ambient temperature with operating parameters, etc. Therefore, the number of cycles indicated in the specifications is quite approximate, and in practice it is unlikely that you should expect a 100% exact match. Nevertheless, by this parameter it is quite possible to evaluate the durability of the battery and compare it with analogues.
USB charging port
The ability to charge the battery directly
from a standard USB port, without using special chargers.
This feature significantly expands the battery charging options. USB ports suitable for this purpose can now be found in the vast majority of PCs and laptops, in 220V outlet adapters and car cigarette lighters, in portable power bank batteries, and devices with a similar function (such as powerful handheld flashlights). Additionally, some portable gadgets like smartphones and tablets can charge external devices using an adapter from a microUSB or USB C port. Another option is a built-in full-sized USB plug at the end of the battery itself; during operation, this plug is covered with a cap and the battery has a standard cylindrical shape, and for charging, the cap is flipped open.
