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Hi
I have the Mijue M10, which I think is great, but the battery doesn't hold the charge for long, only about 3.5 hrs on standby, if I use it, it will drop to less than 1 hour. It's been getting worse over the past 6 months, my question is does any other brand of phone use the same battery, as I am having real trouble getting hold of a replacement.
Thanks in advance for any advice.

your best chance to find one is from Aliexpress. Check this one out. [Only registered and activated users can see links Click here to register]

Are you using any battery monitoring app? If not, try installing Gsam battery spy and check if the battery is around 3.5V when you get the low battery alert.
1 hour on use is too quick. Check and see if the voltage sensing is working correctly.
Try installing CPU spy as well, check to see if your phone is deep sleeping (for the case of quick discharge on standby).