Silent_Buddha
Legend
Barring a bad charging circuit, usually a li-ion battery doesn't go bad unless it suffers temperature abuses, or is left in a discharged state for a long period (which many people don't know, and they burn their batteries). The normal behavior is to leave the controller plugged in when not in use, so it's aways topped, you never have to think about it. If you abused yours, a DS3 replacement battery is $10. Remove 5 screws, replace the battery which is conveniently on a connector, and replace the 5 screws.
But it's more fun to justify an opinion using a hypothetical or an anecdote. You only have to make one up that fit your bias. Like so:
AA will leak if you leave them discharged for too long, and a kitten might lick the acid and die. There. I have a hypothetical that proves AA batteries kills kittens.
Someone forgot to buy AA batteries, and his kid cried the whole christmas eve because he couldn't play with his new toy. Look, I have an anecdote that proves AA batteries make kids cry on xmas eve.
If that were only true. Every single laptop, tablet, slate, remote control (with integrated LI-ON), eReader, etc. has lost battery capacity overtime. Likewise, I know people with PS3's who have had to replace their controllers occasionally as they have gotten less satisfied with the battery life. Some of them either don't like wires going across their living room (actually their Wives don't like it. ) while some of them sit at such a distance from their PS3/TV that wires are impractical, and some have pets that like to chew on cords.
Anyway, I never said integrated batteries are a bad solution. They are just an undesireable solution for me. I will always go for a solution with replaceable batteries over non-replaceable batteries if it is an option.
Regards,
SB