The picture isn't the best, but the coat hanger has got the cable-end quite securely, the cable is simply not long enough to emerge from the seat tube, and is secured inside the BB with a square of duct tape so can't have any more cable pulled through from the downtube.
You've possibly already pulled the cranks but I reckon you need two long bits of hanger - one to pick up the cable end and support it inside the seat tube and another with battery cable attached, may be possible to reunite both ends this way? Probably start by opening a bottle of red first.
The picture isn't the best, but the coat hanger has got the cable-end quite securely, the cable is simply not long enough to emerge from the seat tube, and is secured inside the BB with a square of duct tape so can't have any more cable pulled through from the downtube.