A good power bank normally supports 300–500 full charge cycles before obvious capacity drop. Proper daily care can greatly prolong its working life. Do not keep it fully charged for months or drain it to zero frequently. The best storage level is around 40%–60%. If you will not use it for a long time, top it up every 2–3 months. Keep it away from high-temperature environments. Never leave it under direct sunlight, inside a hot car or near fire. Extreme heat speeds up battery aging and swelling. Use certified cables and adapters for recharging. Poor-quality chargers cause unstable input and hurt the control board. Also avoid heavy drops and water splashes. When you notice continuous overheating, bulging shell or strange smell, stop using it immediately.