East Penn is the DEKA battery manufacturer. we use there products and the warranty rate is less than a %. the batteries are more money than other brand, but the cost of ownership is way less than other brands. the process that they go threw to build the battery insures complete plate formation. they form all the plate out of the battery case and inspect them. if the plate has completely formed they install it. if not they recycle it. i visited the factory and it is state of the art. well worth the money my rep is tom Galvani and he can get you taken care of here is his # 1-206-419-4917