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The PS3 controllers aren't the easiest controllers to disassemble/reassemble, particularly the shoulder buttons/spacers, but I've stripped some of them down to the bare circuit board without too much difficulty. There are a few tricks to make it easier.

A full strip isn't necessary to swap out batteries, but it does mean having to disassemble the shoulder button assembly. Popping the two halves of the casing on the old six axis does require a fair amount of finger pressure between the two analog sticks if you don't want to snap the clip off (not necessary since the screws hold the casing halves together anyway).

But if Sony will replace them, no need to even bother unless you just like seeing how things are put together.

If you only charge them up when the power LEDs are flashing, they should hold a charge for years.