>How powerful is Jesus?
Almighty. Since the Father created the universe through Him.
"In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God. All things were made by him: and without him was made nothing that was made. In him was life, and the life was the light of men." John 1:1-4.
"And the Word was made flesh, and dwelt among us, (and we saw his glory, the glory as it were of the only begotten of the Father,) full of grace and truth." John 1:14.
>What would a battle with him be like?
He would levitate and fight with a Sword. Each slash capable to destroy all evil.
"And he had in his right hand seven stars. And from his mouth came out a sharp two edged sword: and his face was as the sun shineth in his power." Revelation 1:16.
"In like manner do penance: if not, I will come to thee quickly, and will fight against them with the sword of my mouth." Revelation 2:16.
>Can he incinerate everyone in a battlefield instantly like God?
Yes, he can. Because he is God.
>Would he depend on man made tools like the rest of us?
No.
>Drive around in a car, or levitate?
Levitation and teleportation and he would fly around with a white Horse.
"Now I saw heaven opened, and behold, a white horse. And He who sat on him was called Faithful and True, and in righteousness He judges and makes war. His eyes were like a flame of fire, and on His head were many crowns. He had a name written that no one knew except Himself. He was clothed with a robe dipped in blood, and His name is called The Word of God. And the armies in heaven, clothed in fine linen, white and clean, followed Him on white horses. Now out of His mouth goes a sharp[c] sword, that with it He should strike the nations. And He Himself will rule them with a rod of iron. He Himself treads the winepress of the fierceness and wrath of Almighty God. And He has on His robe and on His thigh a name written:
KING OF KINGS AND
LORD OF LORDS. " Revelations 19:11-16.
>Would the second coming of Christ even have a physical form?
Yes. He will have a physical body just like he did 2000 years ago.
"Now Thomas, one of the twelve, who is called Didymus, was not with them when Jesus came. The other disciples therefore said to him: We have seen the Lord. But he said to them: Except I shall see in his hands the print of the nails, and put my finger into the place of the nails, and put my hand into his side, I will not believe. And after eight days again his disciples were within, and Thomas with them. Jesus cometh, the doors being shut, and stood in the midst, and said: Peace be to you. Then he saith to Thomas: Put in thy finger hither, and see my hands; and bring hither thy hand, and put it into my side; and be not faithless, but believing. Thomas answered, and said to him: My Lord, and my God. Jesus saith to him: Because thou hast seen me, Thomas, thou hast believed: blessed are they that have not seen, and have believed." John 20:24-29.
It proves that Jesus ressurected in his human flesh.
"Now when He had spoken these things, while they watched, He was taken up, and a cloud received Him out of their sight. 10 And while they looked steadfastly toward heaven as He went up, behold, two men stood by them in white apparel, 11 who also said, “Men of Galilee, why do you stand gazing up into heaven? This same Jesus, who was taken up from you into heaven, will so come in like manner as you saw Him go into heaven.”"Acts 1:9-12.