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.
It is a state in which the body is completely relaxed, and the practitioner becomes systematically and increasingly aware of the inner world by following a set of verbal instructions. This state of consciousness (yoga nidra) is different from meditation in which concentration on a single focus is required. In yoga nidra the practitioner remains in a state of light pratyahara with four of his senses internalised, that is, withdrawn, and only the hearing still connects to the instructions.