Deltec UMFN55 battery is an ideal choice for modified vehicles chasing a much snappier crank from the engine when starting. The Ultra Series batteries have increased CCA and increased AMP Hour to ensure a reliable battery to carry out the distance required. The UMFN55 was brought in mainly for the S550 Mustang Battery Replacement as the Ford Mustang batteries have a increased cca and amp hour rating comparing to its general replacements. If you follow us on Facebook you'll see the Hundreds of S550 Mustang battery replacements that we have completed over the years. Quick tip while we are on that topic (Please check your terminals from factory - Standard OEM Mustang Batteries tend to corrode the terminals very bad) Our Ultra Series range exceeds the OEM S550 Mustang battery specs. 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. Some applications may see high vibration conditions 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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