Please help me solve the iPad battery self-repair issue.

This is a problem that occurred while replacing the iPad Pro 1st generation battery.

I ordered the wrong battery, so the 2nd generation battery came and I tried to replace the battery with this.

After the replacement, the iPad seemed to turn on well, but the power went out in a minute or two and it didn't turn on again.

If you drop the contact point between the main board and the battery and turn it back on, the Apple logo pops up and turns off, and if you press the power button again, there is no response.

By the way, if you drop the contact point between the main board and the battery and connect it to the MacBook with a C-type cable, the power will turn on well.

However, after using it for 1 or 2 days, the power went out again (the battery is more than 50%), and it did not turn on again.

To turn it on again, it turns on well when you drop the motherboard and battery contacts, attach them again, and connect them to your MacBook.

So I ordered the first generation battery again because I thought it was a problem with the battery version and tried to replace it.

However, when I turned on the power after replacing it, it seemed to turn on well, but it turned off in a minute or two and it didn't turn on again.

The first-generation battery has no response when the main board and battery contacts are dropped and attached, and there is no response when connected to a MacBook.

Currently, the second generation battery is attached, connected to a MacBook, and turned on the power.

Where does the problem come from?

I don't know if it's a battery problem, a motherboard problem, or a software problem Please help me.