All of that previous post nonsense just to say either method is cool. I like the option to change or purchase a rechargeable swappable battery. Mainly because I worry about lithium batteries eventually failing. Happened too many times with my mobile phone and my PS Move controllers.
And yes, I have had a few rechargeable battery packs fail and even some rechargeable batteries that no longer held a charge--but they're not too expensive and AA batteries will be here 20 years from now.