Add a new component to your Character - a collection sphere you can use to collect all the pickups inside of it.
Check out the source here, with the project available for download: https://epicgames.box.com/BatteryCollectorSource
(00L05) - Recap
(00:47) - Collected Functions
(04:53) - Overriding the Implementation Function
(07:27) - Adding a Collection Sphere