Aputure Battery Grip 550DL - Manual (Page 16)

Installing the Battery Packs
1.After flipping out the release handle,turn it as shown by the arrow,
and then pull out the battery magazine(for size-AA/LR6 batteries)
2.Insert one or two Battery Pack LP-E8 into the battery magazine(for
LP-E8)
3.Remove the protective cover of the battery magazine,and then
attach it into the battery grip.
After attacing,check that the battery magazine is securely attach-
ed to the battery grip.
4.Close the release handle
1
2
3
4