Very high quality Li-ion battery in size 18650. A protection board for overcharge, over discharge, short circuit and reverse polarity is installed. Dimensions of the element with installed protection: length – 69mm, diameter – 18.5mm.
The claimed (and real) capacity is 3400mAh, the voltage of a charged battery is – 4.2V. The manufacturer of the Li-ion cell – Panasonic – provides excellent quality. The battery is optimally suited for picking flashlights for spearfishing.