Voltaic Magsafe Adapter - VMAG Laptop Battery to pre-June-2012 MacBooks
This is a reconfigured MagSafe adapter that has been fitted with a standard 5.5x2.1mm plug to connect to the V72 battery pack
Charges MacBooks manufactured before June 2012. Confirm that the voltage output switch of the Voltaic V72 Laptop Battery (12V, 16V, or 19V) matches the voltage output of your AC wall charger as closely as possible. The MacBook Pro Retina may need to charge while asleep or turned off.