I am no expert but until someone answers for sure Im going to help you out and say that yes a 24volt charger will charge a battery slightly. You will in no way get up to 36 volts or the right amounts of amps (volts are like how fast water can come out of a pipe, and amps are like how much water is actually coming out, wide pipe=lots of water; small pipe=less water. but moving both at same speed.)
So yes Im pretty sure your 36v batt will capture some electricity and bring it back to mid-low volts (5-15) but you should really find a 36v charger for you 36v battery.
if you find this charger keep in mind that the lower the amp rating of the charger (say 1amp -3amp) will take longer to charge the battery but its better for the battery.
Higher amps are for fast charges in an emergency and will lower battery performance and life over time.
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You will need a charger with 24 volt capability.
The battery will attempt to charge the charger since the battery is at a higher voltage than the charger. Thus, the battery will simply discharge and generate heat. If you leave it plugged in long enough, eventually the battery will discharge to a point where it can maintain only 6V, where it will stay until you actually charge the battery.
You cannot compare these two totally different things. As far as amperage the charger puts out more amps if it is an auto battery charger and also puts out 12 volts. If you are talking about a 9 volt battery charger then the battery may or may not be more powerful, it depends on how many mii-amps the charger is putting out.
No. The battery will be charged at a rate which is 2* the normal rate. This will cause the battery to overheat which might cause it to explode.
This depends on the capacity of the battery and how much current is used to recharge it. Your best choice would be to get a smart charger that automatically shuts off when the charge is complete.