Norsk Lithium Ion Battery 12 volt 15ahDesigned to provide 15+ hours of runtime on the most common sonar units with screens up to 7. This little powerhouse is the same dimensions as a standard flasher battery, but weighs only 2. 6 lbs! Charge status and two usb ports built into the battery to charge phones and other devices. 1000+ charge cycles, 2 year limited warranty! REQUIRES 2amp or 7amp 12. 6V CHARGER NOT INCLUDED