Optimas and Everstarts are made by the same manufactuer....Johnson controls, the spiral wound agm batts are sub contracted to a company called Banner in Austria, nobody should have to worry about a battery turning over while runnning down the lake if your battery is not secure your taking a chance of a damaging your hull or worse(fire). Deep cycle batteries regardless of brand have a life expectancy they will only be drawn down and recharged a number of time, before they start having capacity loss,....even if your charger tells you their 100% try running a load on them and see if they have the same reserve capacity that the sticker says,I'll bet not. Likewise deep cycle marine batteries are built with heaveir plates to withstand the abuse they get(vibration and pounding)Optimas are built good so are Everstart marine batts. but without proper maint. none will live their expected lifetime.
Johnson Controls Inc. [Sears' DieHard, Auto Zone's Duralast, Wal*Mart's EverStart, Motorcraft, Optima, etc. ], (US)
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