10 min really isn’t enough, but it shouldn’t be stone dead the next time you use it.
Lead Acid batteries don’t like being left discharged.
I always disconnect battery for winter.
“Trickle charger” may not cut it. You want a “smart charger”. It can also tell you if the battery is any good when it’s done.
Chargers like these have brought batteries back that I thought were surely gone. My first battery lasted like 3 years. My 2nd battery (after buying a similar charger) lasted 14 years, and was still good when I sold the boat.
https://www.amazon.com/gp/product/B07CZG91FV
It’s also possible you have a leak in the boat. A crude old test I used to do was use a tail light bulb and put it in series with the (charged) battery connection. If it lights up, you have a significant leak.
But today I’d use an amp meter like this one. One of my favorite tools.
https://www.amazon.com/gp/product/B001TCWL1E