Reference and where to buy a new battery for Hi13?

Hello, I am always satisfied with my Hi13 but I feel that its autonomy decreases slowly.
I would like to know what is the battery reference and where can I buy a new one? I am used doing this type of operation with other models but I did a simple search on sites like Aliexpress or Ebay without success.
Is the 10000mA battery the same model as another chuwi tablet or laptop?

Write to aftersale@chuwi.com. There they will tell you how to get it

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I’ve received the answer from Chuwi
“According to customs regulations, we cannot send batteries separately”
Not very useful, I don’t understand why we can’t find battery part for this model.
I presume I’ll wait some months until the battery lose its capacity then open the Hi13 and maybe try to adapt a battery or buy another tablet to another company.
I’m a little bit disappointed, last year I had replace a battery on a Hi12 without any problem