No
Connect the positive first and negative last.
Always remove the negative (-) cable first. When connecting it back up connect the negative last.
First connect the battery charger positive connection to the Positive post on the battery and the negative connection to any place on the engine away from the battery and not on the negative battery post. Connecting the battery charger any other way is unsafe.
ALWAYS, ALWAYS, ALWAYS connect the (+) cable FIRST. The reason it sparked was the ( - ) negative cable was already connected.
Safe practice directs that when connecting battery cables to the battery, the positive cable should beattached first, and then the negative cable last. In disconnecting battery cables, safe practice directs cable order in the reverse, I.E., the negative cable is disconnected first, and and the positive cable last. The reason for this safety procedure is that IF the ground cable is attached first, then when using a metallic wrench to tighten the positive cable clamp, and IF the wrench in contact with the positive terminal clamp were to come in contact with any grounded metal of the vehicle, then a tremendous short circuit would occur. A massive short circuit results in massive arcing [fireball] which can severely burn a person, damage the battery [or cause it to explode], damage the vehicle electrical system, or worse, cause the vehicle to catch on fire. Always connect the negative cable last, and disconnect the negative cable first!
Assuming neither battery is used to start the engine, simply connect the positive (+) terminal of the first battery to the positive terminal of the second battery. Then connect the negative (-) terminal of the first battery to the negative terminal of the second battery. Connect the load circuit to the positive and negative terminals of one of the batteries as usual. You may want to charge the batteries separately before making the connection, since connecting a charged battery to a discharged battery will result in a very large current flowing from the charged battery to the discharged battery, possibly damaging the wiring or either battery.
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.
All batteries will have clearly marked posts, look for the molded + sign next to it or on the side of the battery. The grounding post will have a negative "-" sign next to it. If connecting your battery to the car, connect the positive post first, then the ground.
Remove the negative cable first and when installing the new battery connect the negative last.
Disconnect the negative cable first when disconnecting a car battery
The man said it Always connect the positive + cable first to the battery. Then connect the negative- cable to the engine somewhere. Never connect the negative cable to the battery itself. Batteries vent hydrogen gas and which can ignite with the slightest spark. For this reason never, ever, connect the negative first and never connect the negative to the battery.
Posittive first then the negative