Motherboard Trouble

In general is it worth trying to solder the piece back in place
Soldering a small thin piece may or maynot hold,protecting the other components from soldering.
Try expiermenting with this board and check the results,that is if you have the materials and equipment to do it yourself,I would not pay to have this done,considering time and cost,replace the board.

Well, you can always try to soder it back. You have to evaluate, is it worth it to replace this motherboard?, is it worth it to give such in-house reparation?. If you think you can live with that go for it.
make sure you don't overheat the mainboard when you try to soder the battery to it because it could cause more harm.
Good luck,
@lberto
PS. Remember to remove memory simms and cpu before attempting to fix your mainboard and also remember to ground yourself before removing any hardware beacuse of the static

It is definately possible to solder this back on. However, with that being said if it was me I would rather hard wire (solder) two wire to the motherboard and replace the battery with one that has connections on the battery pre-wired. Or if you are good at soldering hardwire the battery to the system. You can find most any battery you will need at www.batteries.com
If you are planning on trashing the board anyway you might as well give it a shot.