You also need to determine if you have a good battery.
You can get some idea of the condition of the battery
using a volt meter. After you have the battery fully
charged let it sit over night. In the morning you should
have 12.2 volts of higher. If the charge is below 12 volts
the battery is failing. With the volt meter connected to
the battery check the voltage as the starter is cranking.
If the voltage is below 10.5 volts consider replacing
the battery. Some time ago I bought an exact replica
battery car battery that looks the same as the original
battery the car came with. It came with a card with
instructions on how to extend its life. The card stated-
“A battery looses 1% of its charge each day. When a
battery looses 10% of its charge it begins to sulfate.”
That means particles begin dropping off the plates
and start collecting in the bottom of the battery case.
Over time they build up to where this short out the
plates. So for this reason when you buy a new battery
you want to go to a place that sells a lot of batteries.
Auto Zone, Walmart. If you see a battery rack and
the “new” batteries are all dusty their not likely to
last very long. If you have a battery that is only used
seasonally it need to be on a maintenance charger
if you expect it to last any time at all. If the battery
in your daily driver(s) is 4 years old or older it’s a
good idea to do the above tests in the fall. Beats
the heck out of having to be out there in the cold
with the cables, jumper box or calling for a tow.
That can cost about the same as the battery.
Tubs.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.