Rechargeable Emergency Light I Have To Repair My Emergency Light. The Battery's Black Wire( -ive Wire) Is Disconencted From The Board..?

I have to repair my emergency light. The battery's black wire( -ive wire) is disconencted from the board..? - rechargeable emergency light

This is because the light fell from the table and the cable must be soldered onto the card again .... It is a symbol of stories (BATT ).... but I need advice on how to find the welding on the board.

My emergency lighting looks exactly like this

http://www.ecvv.com/product/vp1273897/Emergency-Lantern-LED-Rechargeable-Stand-by-Light-RN-560L.html