I think it would drain a little faster than that. I had a mix of uA, mA and some conversions in the cells which isn’t obvious so the math might not be that clear. Plus the draw increases as voltage increases.
Here is the detailed math:
Ubox 75v V1
16s * 6p = 96 cells
96 * 14.9wh (capacity @ 200mA drain) = 1430Wh
Assuming 16s @ 4v = 64v. This is in the middle of the 60v and 70v numbers, so call it 4mA
64v * 0.004A = 0.256W
1430Wh / 0.256W = 5,586 hours / 24 = 232 days.
At 25% charge, that’s 58 days.
Ubox 75v V2
16s * 6p = 96 cells
96 * 14.9wh = 1430Wh
Assuming 16s @ 4v = 64v. This is in the middle of the 60v and 70v numbers, so call it 2.2mA
64v * 0.0022A = 0.141W
1430Wh / 0.141W = 10142 hours / 24 = 423 days.
At 25% charge, that’s 105 days.