If you have damaged the traces where the battery is soldered, here is a repair for you, buy a battery holder that has the Black and Red leads. Take the jumper off from JW12 and wrap some of the Red wire around one pin at this JW12 pins. Then bend the two pins together so they touch. Now solder the pins and the wire all together at the same time. Now Take the black lead and crimp on a ring terminal. Remove a nearby screw that holds the MPU board to the tray. Connect the Black wire with the ring terminal to this screw that holds MPU to the tray. Use some mounting tape to attach the battery holder to the place the battery goes on the board. You can get a single "AA" battery holder and use a AA 3.6 volt lithium , or single 1/2 AA 3.6 volt lithium battery holder, or a 3 cell AA holder and use 3 Standard AA Lithium batteries .