you would Shop because Buy. Buy is related to Guy. Guy is related to Dry. Dry is the opposite of Steam. 
Battery can be used for Charge. Shot is a type of Charge. 
Shop --MotivatedByGoal--> Buy <--RelatedTo--> Guy <--RelatedTo--> Dry <--Antonym--> Steam 
Battery --UsedFor--> Charge <--IsA-- Shot 