Other applications may just want to extend or supplement the battery life. This may likely be the case with some portable consumer equipment today. A valid trade-off that must be considered is the size and cost of the additional harvester, compared to adding a larger battery. Some applications want to run forever and even remove the battery. An example of this would be a remote control. Power is not needed until a button is pushed. So, besides dealing with the energy buffering issue, which can be handled by capacitor, there is no need to have power when there is no activity or energy available. Lastly, energy harvesting can be environmentally friendly, especially in the case where the battery is completely removed. In some applications, it will even reduce the requirements from the power grid.