By news@appleinsider.com (Mike Peterson) A new pair of regulatory certifications for a potential MacBook or MacBook Air battery may hint that a hardware refresh is on the way.Credit: Andrew O’Hara, AppleInsiderThe certificates, filed with China’s 3C administrator and Denmark’s UL Demko, cover a 49.9 watt-hour battery with model number of A2389 and a capacity of 4,380 mAh. The model number is as of yet unused, but the capacity lines up with batteries used in current-generation …

Source:: Apple Insider