The battery backup time of Li-ion batteries decrease significantly when they are very cold (and even more when they are at a sub-zero temperature). So I really doubt putting it in the freezer for several hours is going to improve it. I suspect that video is for trolling.Even if you do this try to make sure the temperature gradient at any time is not very high (electronics don't like it when their temperature suddenly rises a lot e.g. from -10*C to 20*C within a few minutes) and wipe off any moisture after you take it out from the freezer. Also ensure that the battery doesn't get wet anywhere (I believe that's what the plastic bag is for). Apart from that I don't believe it is dangerous.You might also be able to get it replaced under warranty; at least some Compaq models have warranties where you can get the battery replaced for free in such cases.
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