Deltec D27 N70ZZ Deepcycle battery is made for heavy duty deepcycle use aswell as being able to start an engine. (Boats, 4WD second battery / AUX Battery, Generators etc. Can also be used in Cars & Trucks) Very Common in Marine & 4WD Setups. (BOATS) – If your boat only has 1 battery in the application with fish finders or other electrical loads then we would recommend you to purchase this over the M27 as it’ll handle more abuse. (4wd Setup) – The perfect option for a Aux Battery. 90AMP Hour Rating aswell as 750cca to start the engine if needed. (We’ve completed run time amp hour tests on these batteries and these actually output 102ah but the 90ah rating from factory is a conservative number. Delivering high corrosion resistance so it will enhance the battery lifespan and performance for superior deepcycle & starting power. Advanced Calcium lead acid battery plates are used to enhance reliability because modern tech alternators charge at higher voltages. Hassle free maintenance free design means simply just install and keep an eye service to service on alternator charge rates. There is no need to check for acid and water levels. Marine application see high vibration conditions from impacts with the waves which have been taken into consideration which is why the Deltec batteries series are built with SMF X-Frame Plus technology with a Advanced Grid Structure to add robust strength. X-Frame Plus technology delivers higher corrosion resistance to enhance the battery lifespan and performance for superior starting power. The advanced grid design allows maximum current flow to accept charge faster then traditional batteries aswell as increasing conductivity. 
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