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Smart battery can measure remaining capacity and estimate the rest working hours. Generally, there seems no difference between smart battery and common battery. However pressing both faces of the battery, which can connect the negative pole and positive one by two metal contact points , will render it to an operating state, Once you loose it, OLED screen will be off. Necessary acquaintance with the working state of the battery can help us timely react to some emergencies such as running out of power. Sometimes, we can put low battery to power a appliance with less demand. Smart battery is rechargeable, reusable, and environmentally-friendly.