Look at :
"Conclusions to save power during deep sleep with Expansion Board :

it is important to use only TX/RX jumpers, or else we will have extra 0.06 mA; large voltage values implies some extra (e.g., 0.02) mA; avoid using uSD cards, because even just inserting a uSD card, not mounted, without open files before deep sleeping, there is an increase in deep sleep current, depending on the type of uSD, e. g., extra 0.21-0.24 mA for a 8GB uSD, extra 0.12-0.14 mA for a 32GB uSD."