Abstract: An enclosure is arranged to receive batteries utilized subsequent to or prior to a radio controlled auto racing event, wherein the batteries are cooled to provide for accurate indication of charging and discharging of the battery. The apparatus includes a fan to direct cooling air through the enclosure and in an embodiment to provide for a cooling medium selectively projected within the enclosure to enhance and accelerate cooling of the batteries. A modification of the invention includes charging and discharging circuitry to permit selective charging and discharging of the batteries when mounted within the enclosure.