How to use an external sd card and recharge the battery at the same time

I'm an happy owner of the tablet nexus 10. It is very good. Some time ago I've bought the leef connector because I want to use an external sd card :

as you can see from the picture,there is a problem. When I keep attached the leef connector I can't recharge the battery. Do you know if there is some way to do both things at the same time ? I want to use the external sd card but when the battery is going to be very low I want to attach the tablet to one USB port or to the wall outlet. Thanks.