Ipad keeps rebooting after batteryreplaement

Just finished putting in the new battery with the iFixit kit. Followed the instructions very very carefully. Took about5 hours since I went really slow. ran battery down to 10 percent and fully recharged as instructed for battery calibration. Unit worked flawlessly all day today. When I got home I put it on the charger again and was working on it when it randomly rebooted. I noticed the battery reported 1 percent. I removed the charging cable and now the battery reports 46 percent. I tried resetting the ipad. It would not stay on long enough for me to restore a backup from iCloud so I went ahead and reset it as a new iPad. That took forever. I’ve tried all the tricks I can find. It is still randomly rebooting and I cant seem to keep it charging for more than 2 minutes. What is the problem? Please help.