2009-2010 Suzuki DF70A DF80A DF90A Outboard Service Manual, Page 233Get this manual
Charging System:
Battery Requirement Description
Suzuki recommends 12-volt cranking-type lead acid battery for the DF708090Minimum battery requirement for starting the engine is provided belowThe battery must satisfy one of the specifications described belowRecommended battery size 650 Marine Cranking Amps (MCA)ABYC or 512 Cold Cranking Amps (CCA)SAE or 160 Reserve Capacity (RC) MinutesSAE or 12 100 AH NOTE The specifications listed above are the minimum battery rating requirements for starting the engine Additional electrical loads from the boat will require larger capacity batteries Dual-purpose (CrankingDeep-Cycle) batteries can be used if they meet the minimum specifications listed above (MCA, CCA, or RC) Do not use Deep Cycle battery for the main cranking battery The use of Maintenance-Free, sealed, or Gel-Cell batteries is not recommended because they may not be compatible with Suzuki's charging system When connecting batteries in parallel, they must be of the same type, capacity, manufacturer, and of similar ageWhen replacement is necessary, they should be replaced as set When connecting batteries, hex nuts must be used to secure battery leads to battery posts It is recommended that the battery be installed in an enclosed case