Tamiya has released Mini 4WD Battery Case 2 under Storage & Case Mini 4WD Series category
This handy situation will hold ten R6/AA/UM3 batteries for the Mini 4WD cars, and rearrangement from the inside allows various designs: four R6/AA/UM3 with ten R03/AAA/UM4; or seven R6/AA/UM3 with five R03/AAA/UM4. The way in which it is is molded in notably opaque synthetic, with various logos printed regarding lid. Measurements: 90mm x 120mm x 22mm. Material: Polypropylene (PP)
