LEGO® Power Functions Rechargeable Battery Box

No more disposable batteries! This rechargeable battery box has built-in Lithium polymer batteries for low weight and maximum power. Use it in your LEGO® Power Functions models and never have to use disposable batteries again!

• Use the #45517 10VDC LEGO Transformer to charge the battery!
• Motor speed can be controlled via the battery box speed control dial!
• Output voltage is 7.4 V!