Different kinds of battery have different discharge rates and some can last longer than others. But in our experiment, although Panasonic brand of battery and Duracell brand of battery have an almost similar lifespan and there was not much difference between them, our results show that Panasonic is the most effective. Hence, Panasonic brand of battery would be the suggested brand to be used. Through this, we have also concluded Panasonic brand of battery is a better choice. This proves our hypothesis of Sony being the best brand of battery wrong.