Efest IMR10440 V1 350mAh (Black) 2013
One of the smaller LiIon cells in a high current version.
Tracking is not perfect, but acceptable, the cells can deliver 1A with full capacity.
An acceptable high current cell.
Notes and links
How is the test done and how to read the charts
How is a protected LiIon battery constructed
More about button top and flat top batteries
Comparison to other LiIon batteries