Magsafe watts question

Discussion in 'MacBook' started by utstudent, Sep 9, 2011.

  1. utstudent macrumors newbie

    Joined:
    Oct 19, 2010
    #1
    I'm trying to power on my 2007 macbook through only the power source. (my battery is Dead)
    The magsafe I'm using is 45watt but it won't turn on my macbook... is it because I need a magsafe with 60watt??? Thankss
     
  2. yusukeaoki macrumors 68030

    yusukeaoki

    Joined:
    Mar 22, 2011
    Location:
    Tokyo, Japan
    #2
    It will work.
    Its just that it needs 60 watt of supplies so if you start using the battery will go down no matter what.
    In order to stop this, you need to buy a 60 or 85 watt.
     
  3. session101 macrumors regular

    Joined:
    Aug 25, 2011
    Location:
    Salt Lake City, UT
    #3
    yeah you need a 60 watt

    45 watts are for the macbook air only
     
  4. fat jez macrumors 68000

    fat jez

    Joined:
    Jun 24, 2010
    Location:
    Glasgow, UK
    #4
    as long as you're not maxing out the CPU and GPU, it should be fine. I've used a 60W charger with my 15" MBP (85W charger) with no problems, but I was only doing light browsing.
     
  5. iThinkergoiMac macrumors 68030

    Joined:
    Jan 20, 2010
    Location:
    Terra
    #5
    So the OP's problem of the MacBook not turning on is just in the OP's head? Just because you were able to use a MBP with a 60W charger doesn't mean a MB will work with a 45W charger.

    OP, have you been using a 45W charger with your MacBook for a while? If so, that would explain why your battery is dead. You could try leaving the charger connected to your MacBook for a few hours and see if it won't turn on then. But you really need a 60W charger.
     
  6. dmk1974 macrumors 68000

    dmk1974

    Joined:
    Sep 16, 2008
    #6
    So I understand better, will a 45W adapter not charge an older MacBook that typically has a 60W adapter? Or will it just not keep up charging when it's powered on? If the MacBook is off, will a 45W adapter charge the battery fine, but maybe just slower? Thanks!
     
  7. session101 macrumors regular

    Joined:
    Aug 25, 2011
    Location:
    Salt Lake City, UT
    #7
    Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_3 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5)

    45 watt might run the computer but it will be using the battery to compensate for the loss, but not recommended, would you run a car with a half ass alternator on 11 volts?
     
  8. dmk1974 macrumors 68000

    dmk1974

    Joined:
    Sep 16, 2008
    #8
    What about charging the MacBook while it is off with a 45W adapter? That should be ok though, right?
     
  9. kbfr08 macrumors 6502

    kbfr08

    Joined:
    Mar 16, 2007
    #9
    The 45 watt was never intended to run a machine that requires 60+ watts, so I really wouldn't count on it to work at all.

    I'd just get a 60w charger, since they're cheap enough on eBay.
     
  10. session101 macrumors regular

    Joined:
    Aug 25, 2011
    Location:
    Salt Lake City, UT
    #10
    i bought mine, the newer adapter from amazon

    just make sure you search "Genuine Macbook Charger"

    i paid $31 shipped
     

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