Help find a battery for your phone ZC520KL

The battery in my phone is degrading, I contacted the service for a replacement, but they even degraded new ones up to 60%, help me find a manufacturer from which you can buy a battery with high quality and inexpensive?
Thanks in advance.
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Hi antipovae79
Thank you for your asking. Kindly provide the information below so that we can better assist you.
1. Can you elaborate more about "they even degraded new ones up to 60%"? What does this sentence mean?
2. Did you visit ASUS authorized repair center for battery replacement?
3. If you have never visited ASUS authorized repair center, please contact ASUS repair center in the country of your residence: https://www.asus.com/support/Service-Center-All-Countries/
If it is impossible to access the service center during Covid-19 period, please try CallUs: https://www.asus.com/support/CallUs
**Please backup before you submitted to the repair center
https://www.asus.com/support/FAQ/1036182/