Run a battery report - from a command prompt with administrator privilege type

powercfg /batteryreport

What are the current and design capacities showing?

Forgot to add. The battery is new.

If it was sold as new, note that it has only 75% of its rated capacity -- I suspect it's old stock and has one or more weak cells in it.  Contact the seller for a replacement under whatever warranty they provided.

A truly new battery should have 95% or more of its rated capacity available at the in-service date -- not 20% below that.

Maybe need to calibrate the battery? The charge level may drop sharply and the laptop will turn off. But after switching on, it will continue to work for a long time at the level of 0%.

There is no calibration needed or possible.

If the battery is OEM, it may be old stock.  If it's not, it's clearly not correctly communicating with the system (which is common for third-party batteries).  Have the seller replace it if it's OEM, or refund if it's third party.

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Thanks for the answer. returned the battery to the seller.