The Qolsys QR0083-840 is a replacement lithium-ion battery for the IQ Panel 4. Using state of the art technology the QR0083-840 is a small battery in the security and smarthome industry, that lasts up to 24 hours. Unlike Li-Ion batteries batteries in typical devices such as your smartphone or tablet, the IQ Panel 4 is typically running on A/C power, which means the battery is only used in an emergency situation. This may dramatically extend your battery life, reducing the need to replace it.