English (West Midlands): of uncertain origin; possibly a nickname for an unruly child, or somebody who behaved like one, though this sense of brat is not recorded by OED before the 16th century. Alternatively, it may be derived from the older word brat(te) âapronâ, âpinaforeâ (of Celtic origin), as a nickname for someone who habitually wore one. View more Surname facts for Bratt More Resources
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This is highly dependant on your usage, and the way in which you maintain your battery. Apple expects your battery to retain approximately 80% of its charge after about 300 full cycles. In newer MacBooks and MacBook pros (2009 and later), Apple claim that the battery can be used for around 1000 cycles (5 years of typical use).