LEGO BATTLE is an experimental learning that we are doing for more than 10 years at our campus. When we carry out delivery lessons, following problems happen. ①To carry heavy a power supply is a burden, because of playing LEGO BATTLE for few hours. ②The cable connector from drive unit of LEGO blocks is too easy to pull off, etc. So we develop new radio control unit for LEGO BATTLE. The improvement methods are following. ①Miniaturizing the electronic circuit part by using PIC12F629, the power supply is inserted in the radio control unit. ②The cable connector is changed to the 006P style connector. This produced unit shows designed movements, and can be useful in various places to do LEGO BATTLE.