I have a Topeak mts trunkbag dxp strapped to rear rack. Battery is too large to fit in top trunk storage.  It would fit in the side panniers (with it poking out the top of the not fully zipped), but would have to counterbalance the other side with an equal weight load.

How easy was the front basket install? Just ordered the rack for the front and have concerns about the wiring harness being in the way. The rack will hopefully be my solution to securing a spare battery for the Bike for longer rides.