But fun is a battery eater

The wireless handheld controllers function properly as long as the batteries are reasonably full. Then the games makes the Carrera digital fun. But as soon as the battery levels, start the car to behave oddly - stuttering driving, hesitant response to controller commands, involuntary acceleration to top speed, etc. In principle, these abnormalities are manageable if the batteries would last longer. Unfortunately, they do not. I already within 4 days the third set of batteries (always three per controller) in there ...! Regulators seem to flow only to suck so. That would not be so bad, but it's just annoying that the controller does not run on batteries (why not?). Too bad, but wired controllers are still no alternative.