I have been carrying a P2DQ5 for almost a year. I like the high quality contruction, size, and brightness. I just don't get enough run-time with the 3.0V LiIon rechargeables. This is because the voltage is wasted stepping down to 3.0V's. Does anyone make a light that is similiar to the P2DQ5 that has different light level modes with a 3.7V RCR ?