I need some batteries in a hurry (under two weeks). The only SJ8 batteries I can find come from China. Delivery would take far too long. IIRC the SJ7 battery will work in the SJ8, but needs a bit of packing to keep the battery in place. AFAIK the capacity is lower than the SJ8's battery; that's not a problem for me. Will the SJ7 battery work in an SJ8 Pro?