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I have my 3DS in my coat when I walk to work, to get play coins and catch any potential street passes on the way in. I'll usually leave it sitting in my coat while I work, so I can take it back out for more at lunch and again at the end of the day.

However it's not clear whether or not I'm using up a lot of battery this way, especially as it's left sitting in my pocket for hours while I just work. Does anyone have any information on how power hungry standby/streetpass are?

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According to this IGN Article, all versions the 3DS and the 2DS should have a battery life of about three days when in sleep mode.

Here is a simple chart comparing all the major differences between the three major Nintendo 3DS models:

    Battery Life    Nintendo 2DS     Nintendo 3DS XL     New Nintendo 3DS XL
    3DS gaming:     3.5-5.5 hours        3-5.5 hours         3.5-7 hours
    DS gaming:          5-9 hours         6-10 hours          7-12 hours
    Sleep Mode:           3 days             3 days              3 days 

You can find an archived copy of the original source here. It appears to have been published by an official Nintendo website, so it should be reliable.

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    Also, this will be the estimated time when the battery is brand new. Rechargeable batteries lose the ability to retain charge over an extended period of time. It might be a year, it might be 10, but eventually that 2-3 days will move closer to 2-3 minutes.
    – user106385
    Commented Dec 11, 2015 at 17:55
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    Is there any information on sleep mode with wireless communication vs. without though? That seems to be what the OP was asking about.
    – Milo P
    Commented Dec 11, 2015 at 22:24
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    @MiloPrice is correct, this info is useful but I'd ideally like to know what difference the wireless communication makes. Commented Dec 12, 2015 at 13:05
  • If he wants to get street pass connections, he needs to enable wireless.
    – Nelson
    Commented Dec 14, 2015 at 6:00

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