Stinger was the first to bring you the Dry Cell Battery for Car Audio! And we have continued to offer the most powerful, compact and reliable car audio batteries available, anywhere! Utilizing advanced battery technology, Power2?s were created with the car audio enthusiast in mind. Offering staggering high current capability, superior fast recharge rate, and true deep cycle operation, this ?Dry Cell? battery allows complete discharge with no negative effects. Corrosion free, zero maintenance design that allows for custom installation inside the vehicle or engine compartment; the versatility of the Power2 allows it to be used as a secondary deep cycle battery or primary engine start power source.