All the LiPo batteries I have received had a storage charge on them, approx 7.6 volts which is plenty for what you did. If you have a LiPo cutoff on your speed control and they were too low, you would not have been able to run your motor at all. The battery should be fine. If you are really worried about it, put it on your charger and use the storage mode if it has one or check the voltage with a voltmeter and see if it is close to 7.6 volts.