Sounds like to low an idle speed.
If the brakes are out then you have no business putting it in any gear because it is unsafe to drive a car with no brakes.
Gear shifting has little to do with batteries, or your car's electrical system. If your car is stuck in one gear, your clutch (on a manual) or even worse, your transmission, might be going out. The dead battery might be just a coincidence.
Second gear. Using the brakes on a downgrade is very hard on them and can (frequently does) lead to early brake failure. You may need to use your brakes a bit on a steep downgrade, but a lower gear is the better choice.
we have to put the gear to neutral and apply brakes, and start the car.
By puting your feet on the brakes
Coasting requires you to put the gear into neutral and let the car freewheel down the hill. If you came to a bend on the hill and someone was speeding up the hill, you may not have enough time to react and slam on the brakes, or slow down. When you aren't in gear, you have less control of your car, as opposed to if you was in gear. E.g. If you were in gear and slammed on the brakes, your car would stall, jerk you forward and stop, however because you aren't in gear, your car won't stop rolling.(It's why you can push your car when it's out of gear, but you can't push it when it's in gear).
360 feet.
it is to control the brakes, it links the brakes with the battery to make a less spongy brake through the electric current.
Take your foot off the accelerator and gently pump the brakes so not to overheat the brakes. Downshift to a lower gear to use the engine for braking
Start the motor and then put it in gear. Point it down hill and release the brakes
keeps you from putting car in gear unless brakes are pushed. I have been doing that wanting to put the truck in gear but it is not happening. It is still stuck in park.
It shouldn't matter to you if your brakes are leaking if your car is already stopped where you want to leave it. Brakes are never used when your car is parked. Just put the car in park and you're done. If you have an automatic, just leave it in a gear.