* Patent design with aluminum shell. * Suitable for 1-4pcs AA/AAA Ni-MH rechargeable battery. * Four independent charging channels. * The LED indicator shows the corresponding charging status. * Microprocessor control with -△V, 0△V, Max Temp, Max Time, dT/dV, Max V. * Outer switching power adapter. * Aluminum cooling system. * Primary and damaged battery auto-detection.