You are experiencing a standard problem with insufficient battery sensor readings, or the sensor lines are broken or discontinuous. Typically, such a problem in iPad appears due to the lack of experience in working with microelectronics. It is good practice to scan a new battery and check its properties. Unfortunately, 90% of retailers, especially those in China, do not see the problem, do not recognize it, or simply hide it.
Another variation on the same problem is insufficient care when disconnecting motherboard and battery. The pins on the contact port become bent or broken, preventing contact and signal transmission between the motherboard and battery. I am writing from memory, so verify it again - in ipad 10.5 there are 5 contact pins (single interface 1.8V - first from the left, ground, 3.8V power supply, 3.8V control and 1.8V data bus - first from the right).
Lack of control, data or SI signal (all low-current data lines) will cause cyclic restarts with an interval of about 175 seconds. The motherboard should be removed from the housing to check the battery port. If the pin is bent, you can bend it slightly, even below the threshold of the others. If it is damaged, the entire port must be replaced. The cost of the new port - about $ 3.5. Unfortunately, most workshops will damage delicate electronics. Avoid untested workshops with an unproven reputation. Repairing a tablet motherboard that is so damaged by an untrained technician in a repair shop is time consuming and really expensive.
If you have a steady hand and y're not afraid of challenges, you can check the condition of the port I wrote above: slightly peel off the motherboard and lift a quarter inch at the height of the battery port and check (take a photo) the condition of the port. If one of the thin pins is sutured, deformed, you can try to bend it back. Remember to protect the battery contact pads.
I guess that's all ...
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