AppleCare has said there is a known issue with some early MacBook Pro batteries, and is cross-shipping fresh replacements to customers experiencing those specific issues. The problem appears to affect MacBook Pro models with serial numbers up to W8608, meaning that only the first two weeks of MacBook Pros produced are potentially affected, according to one report. MacBook Pro battery problem symptoms include battery power level going from a full charge to 90 percent, then immediately off.