It depends on the battery charger. Some chargers will detect that they're hooked up backwards and do nothing. More than likely though it will dis-charge the battery pretty quickly, and probably damage it.
Provided the starter drive is not spun, one of the following areas is probably at fault. A weak battery A poor, or loose connection (at battery, or solenoid / starter). Dirty or rusted starter drive splines. Possibly, but not probable, a faulty starter.
It is a power-driven shaft with radiating blades that are placed so as to thrust air or water in a desired direction when spun by an engine. Propellers are used to drive an aircraft or boat forwards (or when used in reverse, backwards).
2 stroke engines are for the most part are used in motorcycles, boat engines, and other small engines. There have been a few 2 stoke engines used in Automobiles but very few and none that I know of at this time. None of the 2 stokes used in these applications even have a battery. All are started manually and no battery is needed. They use a magneto to supply electrical power to the engine.
PT Boat
if engime is not mounted on a boat,u need to build a mount to securely support it. place engine on mount with propeller in barrel and make sure there is water enuff to cover the water intake. hook up fuel and battery start engine or you can take engine to a boat shop and have them test it
Connecting a battery charger backwards to a battery will likely kill the battery, depending on how long the power is attached.
Chargers don't care is the battery is used on a boat, a car, or whatever. What is important is that you match the voltage of the battery and the charger. Don't use a 12volt charger on a 24volt battery, etc.
Bad stuff
The same way you charge a car battery. The only difference in them is that the marine battery is a deep cycle battery, meaning it is designed to be run completely down without damaging the battery. Ideally you need a charger designed to charge deep cycle batteries but you can charge one with a normal battery charger.
You can hook up a battery and 240v 12v heavy duty charger system,that is the easiest way to get over that problem. The charger has to deliver enough amperage to cover the load from the winch.RegardsJohn Cas
Divers fall backwards from a boat because it is often the easiest way to make a deep water entry from a small boat or rib.
propeller
the boat is going astern. (backwards)
Changing a boat battery can be specific to the type of boat. Many boats have a small plastic box with the battery in it, while others have the battery hidden in a compartment.
Use a special charger, such as an RV or boat charger, that has multiple outputs (best). Connect the two batteries in series, and use a 24V charger (ok, if the two batts are exactly the same). Connect the two batteries in parallel and use a standard 12V charger ( worst choice, one battery tends to hog the current, and they receive unequal charges). See the links for a dual-output charger I Googled.
if they went in foward they would fall in the boat.
Car ans boat batteries will both work on either vehicles. A boat battery is just built a little tougher. This is to compensate for the rough banging and bumps of a boat ride. Boat batteries just cost a little more.