The Hobie Fishfinder Battery Holder can be used to hang inside an 8 in. Twist and Seal hatch or mount to the mast receiver inside the hull. Battery sold separately.
fits perfect in my pro angler hatch with no hardware needed.
I installed batter holder on sail mount post in my hobie 2013 pro angler. It holds battery securely and has clearance for large front tub. It is a perfect fit for humminbird battery I purchased from AKC.