In an effort to get 7.5W charging on the go, update your MagSafe Battery Pack to the most up-to-date firmware. The firmware update starts quickly When you attach your battery pack on your iPhone. The firmware update might take about one 7 days. Working with the higher-wattage adapter which https://supplyforsale.ca/product/45w-l-tip-replacement-power-adapter-charger-for-macbook-air-a1244-a1374-a1304-a1369-a1370-a1377-before-2012-model