Long-term storage:
Batteries should be stored (more than 1 month) indoor with a dry and clean environment at 0 ℃~35 ℃. Avoiding
contact with corrosive substances and staying away from fire and heat source. The battery should be charged and discharged every 6
months. The voltage for storage is between 3. 0~3.3 V (30 ~ 50% SOC).