Lithium battery (lithium-thionyl or LiSOCl2) brand Voltec. The "M" variant has a lower capacity, but it lends itself better to applications with higher currents, compared to the standard ER34615...

Lithium Ion battery type 18650, industrial type (bulk), without individual protection on the cell and with low terminals (low top), mainly used in various mounts for hoverboards, electric scooters...