Avoid fully discharging it to 0% or keeping it at 100% full charge for a long time. Store it in a cool and dry place, away from direct sunlight and high-temperature environments.
The genuine power bank 40000mah from a well-known brand is equipped with overcharge, overdischarge, short circuit and overheating protection circuits, making it extremely safe. Avoid purchasing cheap counterfeit products and follow the normal usage guidelines.
With proper care, a high-quality power bank 40000mah can last for 3-4 years or about 500 full charge cycles before its capacity significantly degrades.