Product Keeper:

1. This product has built-in high-quality original lithium-ion battery, no memory effect, durable. Usually it can work normally at -10℃~40℃, but we still recommend users to use it in the range of 10℃~30℃ to obtain the optimal charging capacity;

2. In order to prolong the life of the product (lithium battery), it is recommended to charge the battery once within 3 months and at least once within 6 months. It is recommended to charge the battery when the power drops below 15%. Please do not drain the battery.