Dead battery, 10volts is not enough potential for a newer car. I would disconnect the battery, leave it on the charger for a day, disconnect it for an hour, then check the voltage. If it is below 12.5V at that point, I'd just get a new one. In fact, personally, since you don't know how old it is, I'd just go get a new one. Bring the old one with you, the car parts store will take it.
Hopefully it's just an old battery issue, if not you'll know pretty quickly.
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