YOU SAID:

It stores energy within the bulb on its back.

INTO JAPANESE

背面の電球内にエネルギーを蓄えます。

BACK INTO ENGLISH

Energy is stored in the light bulb on the back.

INTO JAPANESE

エネルギーは背面の電球に蓄えられます。

BACK INTO ENGLISH

Energy is stored in the light bulb on the back.