Up to 5" screens choose either the SLA or Lithium battery type
For 7" screens choose the Lithium battery type.  
 
Our 5/6.5ah 4.5 Quick Release Kit which includes our pateneted magnetic transducer mount is built on the premise that you might rather forgo the idea of our clamp-on approach and rather fasten the Quick Release base somewhere down on a seat or a deck or other feature of your watercraft.  This fish finder mounting kit provides everything you need to mount and power your fish finder and transducer on your favorite boat.  It will provide enough power to run a 5" inch fish finder for a good long day out on the water, and a 4" inch screen two good days.