I have seen this on well used equipment from time to time. Two things I have seen: A bad diode in the wiring harness (that is, if this particular unit has one) or what we call carbon tracking on the internal sliding components of the ignition switch allowing current flow regardless of switch position. Also moisture in the switch will allow current flow.
Most likely when the battery is no good anymore.
No
No, you can charge it on the mower and you do not have to remove it or disconnect the cables.
A battery booster is a portable battery, fitted with cables and a charger, which is used to charge a dead battery, especially in a car.
There are a couple of ways to charge a battery in a 2005 DeVille. You can use jumper cables with the use of another battery. You can also use a portable battery charger.
Your question is not clear as to what you want to know, so I can only guess. You do not have to remove battery cables to charge the battery if that is what you are asking.
PT Cruiser batteries can be jumped with jumper cables. When jumper cables are attached to the battery in the PT Cruiser and are attached to the battery and another car battery, the battery will get charged, after a few minutes.
Bad battery won't take charge Bad battery cables Fuseable link
A bad stator causes the battery not to charge. That makes the battery light come on. Some other things that can cause the battery light to come on are corroded or frayed cables or connections or a loose/bad ground cable.
If you are 100% sure the alternator is good, then either the wiring or the battery are bad. If the battery has a dead cell it will not hold a charge. Disconnect the battery cables and clean the connections. Charge the battery with a battery charger, and then connect the cables. If the battery is over 3 years old, it is more than likely bad.
You connect the cables BEFORE you plug in or turn on the charger. Positive (red) to battery positive first, then negative (black) to battery ground. Then you turn on your charger and set the timer.
They don't. Jumper cables are used to charge a car battery. Hard drives have no use for such a device.