Fixes device cells

code/game/objects/items/weapons/power_cells.dm

@@ -36,6 +36,7 @@
 /obj/item/weapon/cell/device/weapon
 	name = "weapon power cell"
 	desc = "A small power cell designed to power handheld weaponry."
+	icon_state = "wcell"
 	maxcharge = 2400
 
 /obj/item/weapon/cell/crap

code/modules/research/designs.dm

@@ -274,6 +274,7 @@ other types of metals and chemistry for reagents).
 	build_type = PROTOLATHE
 	id = "weapon"
 	materials = list(DEFAULT_WALL_MATERIAL = 700, "glass" = 50)
+	build_path = /obj/item/weapon/cell/device/weapon
 	category = "Misc"
 	sort_string = "DAABB"