No, it is not necessary to disconnect the batteries.
If it is still in the tractor hooked up unhook it and try charging it if it still won't charge the battery is probably bad. If it does charge out of the tractor you might have a short in your wiring on the tractor. Hope this helps.
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No, you can charge it in the car fully connected.
Sam's Club
If both batteries are of the same voltage (12 or 6) yes, you can use the charger. make sure that they are of the same voltage.
how Can you charge multiple 12 volt batteries with a car?
Yes, if the batteries are rechargeable
Pop the hood.....unhook the cables off both batteries remove the hold down plates and take out the batteries. insert the new batteries and hook everything back up.
The pad can charge as many batteries as it is destined to charge. Most pads charge about 4 batteries at a time.
Tractor batteries typically weigh between 50 to 100 pounds, depending on their size and type. Standard lead-acid batteries are generally heavier than newer lithium-ion options. The weight can also vary based on the specific make and model of the tractor and its power requirements. Always refer to the manufacturer's specifications for precise weight information.
NO!
The majority are all 12 volt.