My friend's MacBook's battery has failed/broken. She took it along to the local Apple Store, who told her as it is 7 years old, it is no longer possible to buy a new Apple battery. It still works when it's plugged in. Does anyone know where she can buy a new one, either Apple or 3rd party, please? MacBook5,2 Intel Core 2 Duo 2Ghz 1 processor, 2 cores 4gb memory Bus speed 1.07ghz I have the serial number too, if that would help.