Power Functions AAA Battery Box - LEGO set #88000-1 (Building Sets)
LEGO Dark Stone Gray Power Functions Rechargeable Battery Box | Brick Owl - LEGO Marketplace
LEGO PART 84599 Battery Box, Power Functions, with Dark Bluish Gray Bottom [ Rechargeable] | Rebrickable - Build with LEGO
Batteries and Battery packs
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LEGO Power Functions Rechargeable Battery Box 8878 | #1799479691
LEGO® Power Functions Rechargeable Battery Box 8878 | UNKNOWN | Buy online at the Official LEGO® Shop US
LiPo Added To LEGO Power Functions Power Brick | Hackaday
NEW LEGO TECHNIC Power Functions Rechargeable Battery Box 8878 $72.99 - PicClick
BrickLink - Part 87513c01 : LEGO Electric 9V Battery Box Power Functions (Non-Rechargeable) with Dark Bluish Gray Bottom [Electric, Battery Box] - BrickLink Reference Catalog
LEGO 8878 Power Functions Rechargeable Battery Box Set Parts Inventory and Instructions - LEGO Reference Guide