The first is to choose the official's after-sales service to replace the battery, but this is expensive and time consuming.
The second is to choose a mobile phone repair shop to replace the battery, the advantage is that the speed is fast, but the store battery price is still not low, but also need working hours.
The third is to replace and buy batteries in the online store. You can search www.dejibattery.com for free purchase, battery replacement is very easy to learn, and the website has related tutorials. After purchasing, please replace the battery yourself according to the tutorial of the merchant you purchased.