Yes, a lawnmower can run on a bad battery if it has a pull-start or manual start option, as these methods do not rely on the battery. However, if the lawnmower is electric or requires the battery for ignition, a bad battery will prevent it from starting. In such cases, replacing or recharging the battery is necessary for proper operation.
Weak battery, or starter going bad.
As long as the battery in the lawnmower is a 12 Volt battery you will be fine.
The ideal voltage requirement for a lawnmower battery is typically 12 volts.
No, it will not harm the laptop to remove the battery and plug it in if it will run that way.
Yes.
Yes, if it will fit.
well yeah absolutely
Most lawnmower batteries will be badly abused by this and it will be quite expensive in gasoline. A lawnmower battery will normally take 8 hrs (or so) to charge. Forcing them to charge faster, like off your car, will harm it.
It is unlikely that the NB4L battery will work for your lawnmower but it really depends on your mower. Most of these batteries are used for small electronics like cell phones.
Yes, it charges from the magneto.
no. not good idea
The Honda Civic Hybrid will run fine on a dead battery, but acceleration will be sluggish.