Macbokk battery drains when shut off

Hi!
I have a 6 months old Macbook who drains battery when shut off. Is it normal to loose aprox 3% battery in 3  days or aprox 40% in 3-4 weeks when completly shut off?
Battery has 10 charge cycles
Grateful for all answers or ideas!

With 646 cycles on that battery, you can expect to see some funny behavior.
If at all possible, test a known-good battery in your computer before investing in a replacement.
And yes, I do think you need to replace your battery.
~Lyssa

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