After dealing with some of the most popular battery solutions we quickly grew tired of failing AGM batteries... Then we discovered XS Power at a local test and tune on a professional drag rig and decided to give them a shot.  A quick online search turned up something that peaked our interest - a video of the small D375 rated at 190 CA starts up a Dodge 12V Diesel over 15 times back to back, a truck which from the factory is equipped with two very large batteries. 

Features

• Absorbed Glass Mat (electrolyte is suspended in fiberglass)
• Great for racing, car audio, motorcycles, ATVs, and marine
• Vibration resistant & valve regulated with low internal resistance
• Plastic or steel case that's sealed and spillproof
• Mounts in almost any position (upside down not suggested) Notes
• Amp/Hour = How much amperage is available when discharged evenly over a 20-hour period
• Reserve Capacity = How long the battery can provide 25 amps at 14 volts and higher
• AGM batteries are fully charged, ready to install, and compatible with a vehicle's charging system.
• If additional charging is ever needed, an AGM-compatible charger will be required.

Specifications:

• 12V AGM Battery 6.50" L x 6.93" W x 4.92" H
• 23.54 lbs
• Amp/Hour: 28 (2000 max amps)
• Reserve Capacity: 55 minutes