Abstract
In order to meet the increasing demand of power sources for portable electronic gadgets, researchers have devoted significant attention towards new ambient energy sources. To run the device for longer period in operation and standby times, we require some external energy sources to charge the batteries from time to time. Mobile batteries are generally charged by conventional method i.e. step down mechanism followed by rectification and filtering. This process causes different types of losses which results in inefficient utilization of power. This paper discusses developments taking place in the field of batteries, energy harvesting and charging techniques to create efficient power system for portable and mobile devices. This paper presents some of ambient energy sources which are naturally present in the environment which can be utilized in charging. In addition to this, special types of materials for batteries to increase its power capacity are also discussed.
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