Gems reskin - credits

[Midonik]

Keeping the gems or gold as game's currency wouldn't make much sense in a sci-fi setting, so I decide to rename and reskin them to "credits" - basically virtual currency.
We need the image tho. I was thinking of something like energy credits in Stellaris - basically an yellow circle with a lighting going thru it. Drawing one exceeds my pixel art capabilities sadly, so I need your guys' help. I will attach my terrible attempt but feel free to start from scratch (the size need to be 40×40px). We do need this to publish the game.

[Anchar]

Maybe as an option to make them as energy (electric) batteries?

[Shark guy 35]

How about a translucent credit card?

[Midonik]

I dont think batteries make sense. If you can make a credit card work then Im open.