Thank you very much to buy our products, our company promises warranty 12 months, battery has any quality problem, within 12 months, we will be free for the buyer to send a new battery. escription: 1. Li-on Battery: 2. Voltage: 3.8V 3. Capacity:2900mAh 4. Use : For Asus ZenFone 3 ZenFone3 ze552kl z012da 5. Security and environment: Double protection functions.Double IC and PCB electric board protect charge discharge and short circuit. 6.Our battery is the same size with original battery. 7: Made in CNINA Please Note: > The battery must be fully recharged before use. > A temporary short capacity of new battery will be resulted from not used for a long time, it is normal, the total capacity will be reinstated via used for 3-5 times. > When first get the battery, use it out, charge for 10 hours for the first three times, use it out again, then it only need to charge about 5 hours for normal use. > Do not use inferior charger to recharge this battery in case of damaging the battery. > Do not disassemble or change the structure of the battery. > Do not put the battery in the charger too long. > Do not expose the battery to moisture and water, do not put it in high temperature environment. > Do not impact the battery. > Put it beyond the reach of children. > The best storage temperature is 20°C--5°C