Does any of those internet tips to recondition Li-ion batteries actually work?
Fully discharge and charge battery


This can sometimes be useful as a step to correct capacity estimates in some "smart" battery packs, like those found in a cell phone or laptop. It is unhelpful for batteries which do not have a built-in controller, and outright dangerous for unprotected cells.


  Freeze the battery for 24 or more hours


Chilling can be helpful for some other electronic devices, like mechanical hard disks. However, I see no reason it would be helpful for a battery. Discharging a lithium-ion battery below its minimum operating temperature (~5°C) greatly reduces its effective capacity on that charge cycle, and charging it at low temperatures can cause permanent damage.


  Shock the battery with 5V


Protected cells will often cut off entirely (terminals permanently read 0V) after being discharged below their absolute minimum voltage (~2.5V). Applying 5V externally might be a way to force the cell to start charging again. However, any cell that's been discharged to this point has already been damaged -- this procedure just resets the protection circuit to allow it to be used again. Additionally, this technique should never be applied to a battery which does not have a protection circuit, or which is not in undervoltage cutoff.


  Connect the battery anti-parallel to another working battery


Applying a reverse voltage to a battery -- especially a lithium-ion battery -- is a terrible idea, and is likely to cause the battery to fail violently. Do not do this under any circumstances.