As a professional power supply device, Neewer CP-80 battery pack is designed to charge Speedlite with external power input ports, including on-camera flashes from Canon. With 8 AA batteries, it shortens the recycling time and gives more battery flashes between battery changes for flashes. * With the CPU circuit design, this device integrates software protection and hardware protection, ensuring higher safety and reliability. * Compact, portable, and easy to connect with speedlite * Secure and reliable with low-power and overheat indication * Faster recycling time and more flashes between a battery changes