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.
Bleeding into the skin from damaged blood vessels causes bruising. This is also called a bruise. Bruises cause a black and blue mark when they first occur. After a few days to weeks, depending on how severe the bruising is, the damaged area will turn more yellowish in color.This is as the body reabsorbs the blood under the skin.his is also called a bruise. Bruises cause a black and blue mark when they first occur. After a few days to weeks, depending on how severe the bruising is, the damaged area will turn more yellowish in color. This is as the body reabsorbs the blood under the skin.