"The reentry will occur between -51.6 degrees South and 51.6 degrees North" -> "We have no f** idea of where or when it will come down, but at least we can assess it won't hit Santa Claus".
That's partly because the drag effect of the atmosphere depends on the solar activity. Meaning, depending solar activity an object will start aerobraking higher up or lower down in the atmosphere. That of course drastically impacts the time it takes the object to fall out of orbit and since we can't really predict solar activity we cannot precisely predict when nor where this battery pack will hit the ground.
