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Hello, I am Jose Sebastian. Your automotive expert, It's a pleasure to me to attend your question. Thank you very much for trust in just answer.
Dear customer, from what you indicate in the voltages, the battery of your mini has reached the end of its useful life and does not have enough energy to start the vehicle correctly.
The voltage should be above 10 volts when it should be considered for replacement, the battery should normally not drop below 10.5 to 11 volts.
Dear customer, you need a new battery. You can also try to bypass with another auxiliary battery but I do not recommend this as it may damage the electrical system.
Your battery has reached the end of its useful life, it will be able to keep the vehicle running but when you want to restart You won't be able to.
Dear customer, you will not be able to start the vehicle with 9V, you need more than 10V.
I would not rule out that the alarm may also be involved but the most important thing at this stage is to check with another battery.
Dear customer just get a borrowed battery to power up your mini, although I recommend that you buy a new battery.
Is there anything else I can help you with?Kind regards.
I'm glad, dear customer, see you next time.