Smartoools - The world’s first AA - 4 Pack of rechargeable battery with MicroUSB connector patented and awarded worldwide A dual MicroUSB cable is included inbox to let you charge 2 batteries together and also use it with your phone or electronic devices. You won’t need an extra Ni-MH charger anymore. Charge all your computer and gaming accessories toys or radio. Can also be used to charge your mobile in an emergency.