Nyko brought out its original Charger Grip for the original PSP back in early 2006, and now the company's slightly altered its design to accommodate the Sony's slimmer, second-generation PSP, which is officially referred to as the PSP 2000.
The idea behind the accessory is that it acts as both an extended battery for the PSP and an ergonomic aid. The battery that ships with the PSP gives you around 5 hours of battery life--and closer to 3 if you're using the PSP's WiFi. If you're looking for some extra juice, you can always buy an extra battery, which will run you between $30 and $40, depending on whether you buy Sony's official battery or a third party's version. The other option is to go with Nyko's Charger Grip ($30 street price), which Nyko says provides up to an extra 10 hours of battery life from its built-in lithium ion rechargeable. This represents a substantial increase over the previous Charger Grip's battery life, which is the result of Sony making the PSP 2000 more energy efficient than its predecessor.
With a little finessing, you simply clip your PSP into the Charger Grip, and in a matter of moments your PSP will suddenly look and feel a whole lot more like a standard PS3 controller. As we said in our earlier review, if we had a criticism for the Charger Grip it's that its plastic clips may be susceptible to breaking, especially if someone should accidentally step on the accessory (or some other form of force is brought to bear on its plastic extensions). Otherwise, the Charger Grip works as advertised. Because of its shape, your hand will feel less cramped when playing with the PSP for long periods, though naturally, as with any controller, it's best to take breaks from time to time and do a little stretching--or your hand will cramp, regardless.
A couple other quick notes: To charge the device, you use the charger that came with your PSP (or any compatible third-party charger), and it takes about the same amount of time to fully charge the Charger Grip as it takes to charge the battery in your PSP (Nyko says it can take up to 8 hours to charge both your PSP and the Charger Grip together). It's also worth mentioning that the Charger Grip comes with a little external power cord that you plug into the power jack on your PSP. Nyko warns that when you're not using your PSP, you should disconnect the power cord from the PSP to help hold the charge of your Charger Grip's internal lithium ion battery.