6 different connectors provided but also a USB port, the absolute standard. If you can not connect to a Smart phone on the charger, then your smart phone is a rotary phone ... and it is not a smartphone actually ;-)
It comes with 2 batteries 2100 mA "Ready 2 use" therefore keep a charge level over a long period (one year)
He accepted the smaller AAA batteries, and the lower part of the charger little bumping. The object will no longer than half of its size already very small.
If charger will never be obsolete as USB standard; WILL MAKE batteries is when the soul, just replace them.
There is also no stopping you to use more than 2 batteries, if the load of your sails is not complete (still unplug the USB plug when you change standard batteries)
You will also enjoy technological development (longevity and performance) rechargeable batteries.
THE best mobile charging system that I know (and I know beauuuucoup)