Xiaomi has its own rechargeable battery – Xiaomi ZI5 AA Ni-MH Battery<br>Classic black and white design, 4pcs in a box. It is a great value collection; a decent, high-end gift; a carefully and beautifully engraved artwork.<br><br>Main Features:<br>? 1500 Times Cycle Life<br>1pc ZI5 is equivalent to 1500pcs premium cells, which reduces the wasted batteries and environmental pollution<br>? Produced by Famous Manufacturer in Japan<br>Every ZI5 battery is produced by famous manufacturer in Japan, ensuring 1800mAh high capacity and long life time<br>? Low Self-discharge<br>After fully charged and stored for one year, ZI5 still remains around 80pct of its original capacity<br>? No Memory Effect<br>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<br>? Fearless about Coldness<br>ZI5 can keep excellent performance even under subzero 20 degree centigrade (charge / discharge temperature: -0 – 40 / -5 – 50 degree centigrade)<br><br>Caution:<br>? ZI5 is not recommended to be used below subzero 10 degree centigrade<br>? ZI5 is recommended to be used with ZI5 Ni-MH battery charger (not included)<br><br>Specification:<br>Size : 50.5mm*14.5m @pcs<br>Model : HR6 (AA 5 number)<br>Battery Type : Ni-MH battery<br>Nominal voltage : 1.2V<br>Battery capacity : 1800mAh min / 1900mAh <br>Maximum discharge current : 3600mA (20 deg.] C)<br>Recommend charging conditions : 550mA * 4 hours (with the recommendation ZI5 charger)<br>Charge temperature range : 0 ~ 40 deg.] C<br>Discharge temperature range : -5 ~ 50 deg.] C<br>Cycle life : after 1500 no less than 60% recovery capacity<br>Self-discharge : a fully charged at room temperature for 1 years to maintain more than 80% <br>Weight : ~ 26.5 g