The 18650 battery typically has a power of 3.7 volts and a current of 2600mAh. An overwhelming number of 18650 types are rechargeable. This feature should become the uniform standard moving forward.
Kriya Yoga is a simple, psychophysiological method by which human blood is decarbonated and recharged with oxygen. The atoms of this extra oxygen are transmuted into life current to rejuvenate the brain and spinal centers.
Reduce colorings by Kriya Yoga: In these first few sutras of Chapter 2, specific methods are being introduced on how to minimize the gross colorings (kleshas) of the mental obstacles, which veil the true Self. (The later sutras of this chapter deal with the the subtle colorings of mental obstacles).