Extend space and the lifetime for your batteries with this BEU from Airtech Studios. Custom fitted for the KWA Ronin TK45 AEG, the Tanker BEU is designed specifically to relieve stress on battery components while providing additional compartment space for wiring. The extra space will allow for larger batteries and reduce the risk of overbending and denting. Crevices on each side of the BEU maintain a constant flow of ventilation to prevent heat buildup. Can fit batteries up to approximately 152 mm (5.98 in) x 19.5 mm (0.77 in) x 11.75 mm (0.46 in).