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A good and fully charged 9ah (or even 7ah, for that matter) is plenty to run an HDS 5 for 8 or 9 hours OTW. The exception being the amount of backlight being used (.4a draw without, .7a with the backlight on). Like RedSled said, buy a $5 volt meter to keep tabs on your batteries instead of just relying on the color of an LED light. A fully charged 12v battery should show something over 13v on the meter when fully charged. For a 6v it should read something over 7v. If they will not charge up to about that, then either they are bad or your charger is bad. Once they are charged up, take them off of the chargers if you don't go out on a regular basis. Another big consideration is to make sure all your connections are still good and waterproof.
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