the problem you describe looks typical with the battery measurement circuit (vbat_sens line). Write about the circumstances in which you damaged the original battery - this will tell us a lot. Meanwhile: the model 8 battery chip has five technical lines: positive, ground, two communication signals to the SMC, and a measurement signal (the aforementioned vbat_sens - part of a gass_guage system, localized on mother board). Its absence or incorrect values causes the device to restart. Here we have at least two solutions again: (1) the new battery is damaged or you have damaged the flexible connecting tape while wrapping the connector section when plugging or (2) - when disconnecting the original battery or connecting a new one, you damaged the electronics located near the battery port on the motherboard (by the way - by what did you take out the connector of the original battery?)
I'm afraid that the help of a service technician will be needed - find a good repair shop and tell about the incident.