Was it the Sinewave Reactor that started failing to hold a charge and broke, or the Revolution?

It sounds like you had the B&M Luxos U. Is this newer model still the Luxos U? B&M newest model is the IQ-X. If you do have a new Lexos U, did you have anything charging in the USB port while you were running the light? From what I gather, you cannot use the USB and lights simultaneously.