Before purchasing an electric screwdriver , you should know how to determine its battery life. Electric screwdriver batteries are measured in milliAmp hours (mAh) or amp hours (Ah). A single Amp hour can provide one amp of power for one hour. An average electric screwdriver battery lasts for about six minutes. It is therefore important to choose a pneumatic screwdrive r with a high enough battery life so that you can use the tool continuously without needing to recharge it. screw assembly robot battery power is expressed in volt-ampere (VA). The higher the voltage, the tightening torque will be higher. The battery capacity indicates the autonomy of the electric screwdriver. For larger jobs, you can purchase extra batteries in case the battery is exhausted too quickly. Battery life depends on the type of screwdriver and the length of the battery. A cordless screwdriver is useful when powering several screws at once. Some screw assembly solutions come with ...