does bluetooth enabled device drain ipad battery?

Discussion in 'iPad Accessories for iPAD 1, 2 and 3' started by foothillfanatic, Sep 21, 2012.

  1. foothillfanatic
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    foothillfanatic iPF Novice

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    I recently purchased a Logitech solar powered keyboard/case for my iPad2. I noticed that after leaving it in the closed case for a few hours that the iPad battery was soon depleted. There were no instructions stating that the bluetooth needed to be turned off when not in use. My question is, does bluetooth use the iPad battery when left on?
  2. AQ_OC
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    AQ_OC Super Moderator Staff Member

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    Bluetooth uses an antenna to send and receive signals. Thus, it uses energy. I have BT on all the time for my phone, but it goes to sleep when one of its pairing devices is not near by. I have my phone paired to my car and to a speaker. Heck, it is enabled right now on my iPad. But the BT icon in the upper right corner of the screen is greeted out, so BT is not on. But since nothing is in range it turns itself off. If you leave two devices close then BT stays on if they can "talk" to each other.....the battery drain can be very rapid then. In my car, my phone will get warm (indicating battery drain) when streaming music, so I keep it on the charger. I haven't noticed this with my keyboard, but they are very close together and there is much less info to transfer. So, yes, BT can drain the battery under certain circumstances, but it is also smart enough to go to sleep the the pairing cannot be maintained....and you typically have to wake it up to re-establish a connection. But that seems to depend...my phone always wakes up when I get in my car, but my keyboard and speakers don't. This might be device dependent, somehow.
  3. foothillfanatic
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    foothillfanatic iPF Novice

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    I guess that is what's happening, as when I turned off BT on the iPad, the battery did not drain rapidly. I don't think the Logitech keyboard turns off automatically after not being used for awhile. When I manually shut it off the BT symbol on the iPad screen does disappear. So guess I'll have to shut off the BT on both the keyboard and iPad to minimize battery drain. Thanks for the help! Even while typing this post the iPad battery showed 3% loss. Seems BT is powerhungry.
  4. AQ_OC
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    AQ_OC Super Moderator Staff Member

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    It probably is better to turn if off, especially if you can't charge it often.

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