Optima Batteries D27M BlueTop Group 27 Marine Battery have enough deep cycle power for stereos, GPS systems, bilge pumps, fish finders, and other high-demand electronics, while still providing plenty of cranking power to start the motor. These batteries have longer life, more vibration resistance, is completely spill-proof and mountable in almost any position and faster recharging capabilities. Damage from vibration can cause battery failure. The cells in an Optima battery are tightly compressed into supportive chambers and secured with solid cast cell connections resulting in 15 times more vibration resistance than traditional batteries. Tightly sealed cells allow for mounting in multiple positions without leaking or damaging your vehicle and glass-mat separators absorb electrolyte to eliminate acid spilling.