Your 36V 16Ah pack consists of 40 x 26650 size cells:
Lithium ion rechargeable battery, 26650 size, LiPF6 electrolyte, Manganese Spinel structure cathode.
High energy density lithium ion battery cell.
Cell capacity: 3.8V 4AH
Cell diameter: 26.24 ± 0.16 mm (top end), 26.16 ± 0.10 mm (bottom end)
Cell height: 65.05 + 0.10/-0.15 mm
Cell weight: 92g
Maximum continuous charging current 6.5A
Maximum continuous discharging current 10A
Maximum pulse discharging current 40A
Hope this helps.
Alan