It's called "MightyMite" & it cost around $50/- which is an excellent deal. If your light source has a 12V cigarette lighter (male) connector, it will fit into the female socket on the MightyMite.
http://www.autozone.com/
& search for "MightyMite" (type this exactly as shown here).
Here are the specs from the website:
Jump Starter/12V DC Power Source - Don't let the smallest of our power source units mislead you by its size
Easy to read battery status LEDs - tell when internal battery is at full power, 75% charged or 50% or less and needs charging
Sure-grip, 200 amp, jaw clamps for top and side post batteries - allows for quick and solid connections
Charging & Charged LED indicators - indicates charging status of internal battery
#8 gauge, 18' cable - stays flexible in cold temperatures
Charging and Charged LED indicator - to help easily monitor the charging of the internal battery
Storage mounts for clamps - keep clamps safe for longer life