Isnt that an abnormal high self discharge rate? ??Balance 8P cells to 3.65V.
Let sit 10 days.
8S cells and charge. Within 30 seconds, peak cell at 3.8V and low cell at 3.36V. Got that high because the Chargery delay was set to 5 seconds.
No cell needed more than 6 minutes of individual 10A charging to hit 3.65V again. After that, they were fine.
10A for 6 minutes is 1Ah. 1Ah/280Ah = 0.36%. All cells required < 6 minutes, so I rounded down to 0.3%.