Main Features: ● 1500 Times Cycle Life 1pc ZI5 is equivalent to 1500pcs premium cells, which reduces the wasted batteries and environmental pollution ● Produced by Famous Manufacturer in Japan Every ZI5 battery is produced by famous manufacturer in Japan, ensuring 1800mAh high capacity and long life time ● Low Self-discharge After fully charged and stored for one year, ZI5 still remains around 80pct of its original capacity ● No Memory Effect The ZI5 can be charged and discharged at anytime, the usable capacity of battery will not reduce, and the correlation between voltage and charge status won't be shifted ● Fearless about Coldness ZI5 can keep excellent performance even under subzero 20 degree centigrade (charge / discharge temperature: -0 - 40 / -5 - 50 degree centigrade)