How to buy and replace Mifi batteries in China

Technical Support for Routers
1

How to buy and replace Mifi batteries in China？Can mifi be deducted and upgraded to xe300?

2

17年12月份在淘宝官方店购买的全网通版本，

WechatIMG3
WechatIMG31170×2532 185 KB
，现在电池老化无法使用，能否折价升级成xe300？

3

这个你可以直接淘宝问客服呢。

You can talk with customer service on Taobao directly. Cannot process in the forum.