I they were going to put in a new larger one but it's just taking a Razr apart.
Fascinating to watch but I wouldn't want to do it.
As mentioned by me in another thread, there are a couple things this video doesn't address that could cause people to be a bit apprehensive and should cause them to pause before choosing to tackle this. First, the battery is adhered to the back plate with double-sided tape. Removing the back plate requires a good bit of patience and muscle, but not an aggressive pull - rather a steady firm pressure that maintains a consistent level of prying action to prevent ripping that double-sided tape, and also without cracking the hard plastic bezel (surrounding the Kevlar). The video shows that the cover once removed is very flexible, but the plastic bezel is still succeptible to cracking or stressing from being bent too far.
Also, when using the spudger (case pry tool), you must be EXTRA CAREFUL not to jam it into the very delicate foam rubber grommet at the bottom that surrounds the noise-cancelling microphone. It's visible in the video as a small grey teardrop shaped thing with a hole in it at the bottom of the inside after the case cover has been removed. The fact that you need both a T5 and a T3 driver to remove the battery connections and the stabilizer bar at the top of the battery will make it less likely an ammateur will tackle this task since the drivers are somewhat hard to come by. They can be ordered online but you generally can't buy them at local hardware stores.
Next, the clips that hold the back cover on are only meant to be closed and locked once during manufacture, meaning they weren't engineered to be removed and replaced multiple times. This may cause the clips to lose some of their holding strength the first time they're removed (and every time thereafter), so the back will not be as secure going forward. Also, the double-sided tape will pick up all sorts of junk including airborne dust, dirt and oils from your fingers, etc., making it less sticky going forward. Considering the design incorporates the battery and back cover into the frame so that the entire phone becomes ONE SOLID laminated device, any damage to any of the clips or adhesives will reduce it's strength making it more succeptible to flexing.
Finally, things you must also consider are that once opened, you may be eliminating any water resistance since the "coating" is only mollecules thick on parts and gaps, so tearing off the back will break those seals along the phone's edge and may also disrupt the coatings on components inside simply during the flexing while removing the back and battery. You'll notice that when he removed the battery it was actually bent slightly in the middle from pulling the tab, so the battery is somewhat flexible as well since it consists of only several laminates of plastics, metals, and pastes.
Bending the battery may actually cause it to fail and could be catastrophic failure if laminates are able to make electrical contact causing an internal short.
Also, the battery is capable of dumping a very large amount of its stored power in a flash and can be a fire hazzard if the contacts are shorted.
Not only do they risk starting a fire by heating up whatever they touch, but the battery itself can overheat again potentially being a risk of fire or explosion.
Handling a Lithium Ion Polymer battery (especially one that is naked such as this one) should be done with considerable care. :blink: