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Bottom Line This Sanyo is one of the new generation of slightly larger cylindrical cells being brought to the market primarily for automotive use. It is 20mm in diameter and 70mm long, a 20700 battery. Other sizes and designations for similar cells from other manufacturers include 20650 and 21-70.
I am rating this cell at 16A 4000mAh. It runs a few degrees hotter than the HG2 (which is why the Sanyo has a lower rating) but at 10A and 20A continuous down to 3.2V the Sanyo lasts about 25% longer.
There is also a Sanyo 20700A cell which is rated at 3100mAh and about 30A. You'd have the capacity of a VTC6/30Q/HG2 plus a 30A rating for just a small increase in battery size.