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.
-When blood supply is cut off to part of the intestines. -Inflammation of the stomach lining (gastritis). -Trauma or foreign body. -Widened, overgrown veins in the esophagus and stomach. Eating black licorice, lead, iron pills, bismuth medicines like Pepto-Bismol, or blueberries can also cause black stools. Call your doctor right away if you notice blood or changes in the color of your stool, NIH advises. In children, a small amount of blood in the stool is usually not serious.