Well, it's not a waste of battery since I put mine in the cradle when I'm done playing. But I leave mine on because of Spotpass updates. I used to get Dead or Alive updates and downloads on a fairly regular basis, as well as firmware updates.
Nintendo Video will also auto-download overnight, so I don't have to think about it when I grab the system and go out for the day.
But that's just me. I use my 3DS enough to justify leaving it on all the time. My PS3 on the other hand, is always off. Keeping that thing always on is a waste on energy. At least at my house. *shrugs*
Those saying there's no reason to turn it off and it doesn't waste the battery because it's always plugged in...You do realise after X number of recharges battery packs begin to lose their effectiveness?
Same as in mobile phones. Eventually your battery just isn't going to be able to hold a decent charge. Sure it's a ways off, but why hasten the demise with constant charging?
With Lithium Ion batteries you want to charge them as often as possible. That means that if you use your 3DS for 30 minutes, it's better to charge it when you're finished playing, even though the battery is only a little drained. In other words, keep the 3DS on the charging cradle when you're not playing it and you'll be maximizing the life of the battery.
Really?That's interesting. Is this a different battery type to the SP? Or DS?
I can't remember which one of those systems it was, but I remember reading the manual and it expressly stated that the battery life would slowly lose effectiveness dropping to about 70% after approx 500 charges. Plus, I'd already experienced the same issue with a number of my phones. So I assumed that the 3DS would be much the same.
It's the same type of battery that's in the SP and DS.
It's true that Lithium Ion batteries will begin to lose capacity when it reaches something like 500 charges, but those are full charge / discharge cycles. If you drain the battery to 50% and then charge it, that counts as only half a charge / discharge cycle, not a full one.
There is no punishment for charging a Lithium battery, so you might as well charge it as often as possible. In fact the worst thing you can do is always drain the battery to empty.
Oh yeah, it's using energy, sure. I just don't see it as a waste since I'm getting something out of it. I need to recharge the thing overnight anyway, so it's gonna be using my electricity one way or another.
I just don't see the point in switching it off. *shrugs*
EDIT: I should clarify that my 3DS is not always on the charger. Really only at night. I use mine throughout the day.
I almost always leave it on because I want it to automatically download new videos and notices and such. The only times I've turned it off is when I've been away from home for more than a day and I wanted to preserve battery life without the ability to readily recharge.