Power Functions AAA Battery Box - LEGO set #88000-1 (Building Sets)
BrickLink - Part 87513c01 : LEGO Electric 9V Battery Box Power Functions (Non-Rechargeable) with Dark Bluish Gray Bottom [Electric, Battery Box] - BrickLink Reference Catalog
LEGO® Power Functions Rechargeable Battery Box 8878 | UNKNOWN | Buy online at the Official LEGO® Shop US