In my opinion this is a bad nand chip. The itunes log would be useful. I have solved such problems with reballs.

A new shipped battery should have a 40% charge ideally. In this case the battery had none, boot loops most often occur because of battery issues and incorrect shut down. As the charge is applied Ipad starts to boot, this creates boot current draw that the usb charging circuit cannot provide (normally this comes from the battery!) Triggering temp sensors can allow a boot charge to gather giving the battery enough energy to meet the boot current demand, then be shut down properly then of course charged in the normal way. However if this happens with a new battery I would strongly suspect the battery, you should never seal a case after changing a battery, until the Ipad has been booted and all functions checked! I have observed a number of cases where a battery low signal has been shown when plugged in, applying moderate heat to the rear casing has within a minute allowed the ipad to boot and show a good charge level, in all these cases a malfunctioning Li battery pack was identified as the cause and changing...