Not by connecting them directly, that'd be too powerful.
You will need a charger with 24 volt capability.
24 volt
no it can't
Yes
24 volt armature is accept balancing cut
The same way you charge any battery, by hooking it up to an appropriate charger.
Separate the 2 12 volt batteries and charge them individually.
No, you need a 24 volt charger.
I can if I charge 2 of them at a time. Most 24 volt chargers also have a 12 volt setting. What is hard to find is a 32 volt charger. We can charge a 12V battery with 24V charger, by connecting two 12V batteries in series i. e. the negative terminal of the first battery is connected to the positive terminal of the second, now the charger positive terminal is connected to the first battery positive terminal and the negative terminal of the charger is connected to the negative terminal of the second battery.
I'm actually charging my 12V sealed lead acid battery with a laptop adapter which output is 19V, 2.1A. I'm not sure this will shorted the life of my battery or not, but the battery hold the charge. I don't have a voltmeter to test the voltage, but the battery can light up a 12V car headlight light bull. So, I guess it work.
You would need a 24 volt charger. Connect them in parallel and you can charge them both with a 12 volt charger. Or disconnect them and charge each one separately.
Most 24 volt systems use 2 or 4 12 volt batteries. Be careful not to let the cables get mixed up. They need to be put back in the same spot. Disconnect the battery, Charge each battery individually, Reconnect the cables exactly like they were before. You are ready for work.