Merge pull request #9568 from r4d6/patch-3

[Fix]Make Cells not a viable replacement for the Stock Part Cheese

code/modules/power/cell.dm

@@ -20,6 +20,7 @@
 	var/self_recharge = 0 //does it self recharge, over time, or not?
 	var/ratingdesc = TRUE
 	var/grown_battery = FALSE // If it's a grown that acts as a battery, add a wire overlay to it.
+	rad_flags = RAD_NO_CONTAMINATE // Prevent the same cheese as with the stock parts
 
 /obj/item/stock_parts/cell/get_cell()
 	return src