Register your information online.
There are fast charge (10 minutes to account) and slow charge (3 days to account), and the discount range is different, generally between 92% and 99% (the discount is not fixed). Need online payment, Alipay or online banking.
The system is not very stable, and sometimes I can't log in. However, I managed to charge the battery several times on time and found no problem.
I suggest you charge 50 first.