replace it
I'm assuming its a riding lawn mower of some type. Our own lawn mowers of this type have an alternator in them that keeps the battery charged
No, it is not necessary to remove it. You can charge it right there on the mower.
Not at all. A 35 amp charger is far too large to charge a lawn mower battery. Use a 10 amp automatic charger.
yes as long as it is not totally dead.
NO You have to many AMPS from a car, you can jump start it butdon't charge it.
Do you mean that you can not charge it with a battery charger or the mower will not charge it while it is running? If you can not charge it with a battery charger and you are sure that the charger works then the battery is bad. These type batteries are only good for a couple years. If the mower is not charging the battery it could be a number of things.
dead & needs replaced.....
The lawn mower should charge its own battery as it runs. They have a charging system built in them on the underside of the flywheel. If it's not charging you may have to charge it every time depending on whether you use lights or electric clutch or any other electrical item..
can a 12v lawn mower sealed battery be charged with 12v battery charger use on cars
Provided the charging system on the mower engine is operational, a small amount of charging voltage will be supplied to the battery during use.
you may be able to recharge one, there are some gimmics out there but i doubt they work, if it won't hold a charge replace it, they aren't expensive 20-40 dollars
Depends on the output of the charger which you did not list. A dead battery can be recharged with a 10 amp charger in 3 hours.