Give your R.E.V.'s a boost with this rechargeable power pack and USB adaptor.

Simply remove the current battery compartment in your R.E.V. cars and replace it with the rechargeable power packs.

To charge the power pack, remove it from your R.E.V. and plug it into a USB adaptor. 

An LED Indicator will let you know when it is charging (red) and fully charged (green).