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 (Lithium-Polymer) type LP102050 battery (10x20x50mm), 3.7V and with a capacity of 1000mAh used in professional applications and medical equipment. Being very light and able to operate...