Mondpalast 4x ® 5400LM CREE XML XM-L T6 metal bike light / bicycle lamp bicycle / projector / headlights 3 Mode (Electronics)
Because there are no instructions, I recharged the battery until the led on the charger is green. Then after about 15 minutes of cycling (thus more light later), the light went out and comes on more even trying to charge the battery.
