Great on long trips!!!!!
IF you are going to take you PSP on a trip over 4 hours long this battery upgrade is a must. On my trip (over 6 hours) my PSP kept on working. It was nice I did not have to worry about my battery dieing.

I LIKED THE EXTRA BATTERY LIFE
I like th extra life of the battery i can play for 6 plus hours.it should bring extra cap with and red.

More Power
This works just as good as the slim battery, but a lot longer. The back case is bigger to fit the bigger battery, but I actually prefer it, because it is easier to hold on to. I think I will be turning my slim battery into a pandora battery now.

Does what it should
I am very satisfied with this battery. I bought it extend the life of my system without feeling the need to recharge it every other day. At this point I probably play on the PSP an hour or two every night and don't have to worry about charging until the weekends.
Sometimes you want a product just for the piece of mind it gives you and this delivers on that.

double the fun, double the juice!
Sony made a very wise move, add 2 battery covers for PSP2K
and it's 100% compatible with PSP2K
unlike off or grey market product, which is hit or miss
this battery kit is definitely good upgrade for PSP2K, though I have 1800mA/h batteries from original PSP, missing the cover that left the battery uncovered, and the game ruins when the battery falls off
the kit comes with a cover that fixed the issue
a must have for PSP2K owners, even already have 1800 or 2200mA/h battery
don't settle for less!