I have MBP 2015, it had 13% charge so I closed it so it will go to sleep. I switched it on today and the battery is dead. 1) If my iphone battery dies everything runs just as good, but I am under the impression if a macbook/computer battery dies during sleep the system get corrupted or malfunctions. Can any one elaborate? 2)Why did the battery die so quickly? I thought at 10% it should last like 2 hours running but the battery died/drained while it was sleeping/hybernating (I closed the lid). The MBP is brand new and this was its second full charge to drain (2 cycles).