The scavenged battery.

Li-po. Large. Each pair of tabs feeds a separate cell internally.  

There are two negative and two positive tabs when not soldered together.

20Ah?

8 of the 10 cells in the original pack were salvageable.  

8S battery so... 33.6v fully charged, 24v fully discharged.  

The original low voltage warning for the 7S hoverboard battery is probably 21v, so some care is in order until I can purchase a proper 8S BMS.