I believe if you have a Vita then you must own this:
It is like the trigger grips minus the trigger attachment, but it makes look more like a playstation controller. According to Nyko the developers of this product this attachment gives you x2 the battery life for $25 while gamestop says it gives you 50% more battery life priced at $30. Even if it gives you 50% am still looking forward to buying one of these because it looks like a great deal.
Nyko - Products - Power Grip For Ps Vita