The Micro FlexDrive is a high-efficiency switching current regulator that can be powered by battery combinations which result in a Voltage of 2.0 – 5.5V DC (and up to 6.4VDC with a diode in series). This includes 2-4 AAAs, AAs, Cs, Ds, and single lithium batteries primary and rechargeable. The driver operates as a current regulated source, varying the output voltage above and below the battery voltage as necessary to meet the current output setting and keeping rock solid laser output. In continuous operation, the driver will drain the power source until its voltage reaches 2.0V and then will shut off. This, combined with the high efficiency of the driver provides the maximum runtime possible for portable lasers. This driver is capable of delivering up to 1.5A.