Lumix DMW-BLG10 battery holder

Suitable for holding three Lumix DMW-BLG10 batteries.
Used by following cameras:

Lumix DMC-GF3
Lumix DMC-GF5
Lumix DMC-GF6
Lumix DMC-GX7
Lumix DMC-LX100
Lumix DMC-ZS60
Lumix DMC-ZS100

I recently bought Lumix DMC-LX100 camera and unfortunatley It happened to have poor battery life compared to my DSLR. So in order to take reasonable amount pictures and video I bought three extra batteries.
I made for them a nice little box so they would fly around in my camera bag and by placing battery contacts up or down could I tell if the battery is empty or not.

I am very satisfied with the design, the wall offer just a right amount of friction to keep those batteries in and the size of the box is marginally bigger than three batteries combined.