Have you tracked how much you spend on those AA, AAA batteries that you insert into the cute toys?
Sure, they are not expensive…about 25 to 50 cents a piece if you buy in bulk.
An AmpTORRENT™ battery, on the other hand, can be used 500+ more times. Each time fresh as new, and actually stronger than most main-brand batteries you can find in shops or online. Sure they cost more per piece, but are much cheaper to run, especially you have an enthusiastic racing car, real or virtual, driver in the family!