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Open Impulse has battery. Open Impulse’s battery, in a narrow sense, is defined as a device that converts the chemical energy it stores into electrical energy. In a broad sense, it is defined as a device that converts the energy it stores into electrical energy for external use. Therefore, a device like a solar cell that only converts and does not store is not a battery. Other names are battery, battery cell, and the Chinese "pool" and "bottle" also have a storage function. The history of the battery can be traced back more than 2,000 years to ancient Iraq. It's a plain clay pot found in the capital Baghdad. It's a battery that USES copper and iron. The objects found by archaeologists are believed to be the earliest evidence yet of a battery.