The Infapower Intelligent Universal Charger features “minus delta V technology”. This means that each battery is individually monitored and charged to its maximum capacity and then switches to a trickle charge ready for use. Comes with USB-C cable. It has 7 independent Channels which completely fill each battery and can charge the following combination of batteries: 6 x AA or AAA + 1 x 9v. or 4 x C or D + 1 x 9v. Features Include: Fast type C USB charging. Battery reverse and short circuit protection. Alarm indication function. Will charge any brand of rechargeable batteries.