Until then, no worries
The battery is quite heavy, and looks well made unlike compared gsm battery "samsung" low end
Then I do not have a battery cover with my psp but good news: once the plastic removed the battery hold perfectly in the console, another positive
The battery comes to 50% of after the system battery, 4 hours of battery life 50%, in reality, I made 4 hours 30 (without too much play, but by manipulating the console) => a view over an official battery, because I have not had in
The battery held out the time announced by the systems, and is not heated at all even in games after 20 minutes (on tekken6 / dragon ball shin budokai) therefore another positive
Unfortunately I have not yet charger, and I can not tell if it is sustainable, but it has all the air to do with time, jactualiserai this position if concerns arise eventually
edit: After one week with a charger, no worries