1 If you add music and files to your iPod while you are charging the battery, it will take longer for it to charge. 2  Before using your iPod nano for the first time, it is important that you let it charge for a minimum of three hours. 3  If you do not, you can weaken the battery, giving it a shorter lifespan.
There is also a chance that your black period blood is caused by an infection or STD. Uterus infections can cause blackening as well as many STDs. Women that have sex during their cycle also experience black bleeding because the blood was pushed back into the vagina and can become trapped as a result.
But if you're not in pain and the foot is working fine, you should be fine. For what it's worth, a friend of mine broke a blood vessel in his privates while playing lacrosse. When they began turning black, he made a panicked dash to the emergency room, only to wind up surrounded by laughing med students. Source(s): baxterville Â· 7 years ago.