MK Battery - Battery 12 Volt DC - 18 Amp Hour 7-1/8 Inch Length x 6-9/16 Inch Height x 3 Inch Width - ES17-12
AndyMark Inc. on Twitter: "The MK ES17-12, 12 Volt, 18 amp-hour sealed lead acid battery with nut and bolt connector has proven to be a trustworthy power source for FIRST Robotics Competition
MK ES17-12 Battery 12v 18Ah Rechargeable Sealed Lead Acid | OSI Batteries