Is this the biggest Sony PSP Battery ever?

I have seen some pointless products in my time, but this Sony PSP battery takes the piss. Look at the size of it, it is huge. This has to be the biggest battery for the Sony PSP I have ever seen.

I just do not understand why someone would want to make a battery so large, that you can’t even put the battery cover back on. I would think that the battery would weigh the Sony PSP down on one side.

Is this Sony PSP Battery useless or what?