AC Adapter Question

Discussion in 'Lenovo' started by raydabruce, Jul 8, 2010.

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  1. raydabruce

    raydabruce Notebook Carnivore

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    Sorry if this is a dumb question but I don't want to "overpower" my ThinkPads.

    On the local Craigslist there is a 90W power adapter for sale for $30. It's the 90W (FRU 70Y4659). Lenovo and Newegg will charge me nearly double that. He says it's rarely been used.

    My question is: Is this safe to use with either of my ThinkPads? (See signature). Will it speed up battery charging? They both came with the 65-Watt adapters.
     
  2. JabbaJabba

    JabbaJabba ThinkPad Facilitator

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    Yes, no problem at all.

    I believe you mistyped the FRU (should be 40Y7659), but as long as it is a 90W - 20V ThinkPad adapter, you are good to go.
     
  3. raydabruce

    raydabruce Notebook Carnivore

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    Yes, you're correct. It's 40Y7659. Thanks for the answer.
     
  4. hceuterpe

    hceuterpe Notebook Evangelist

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    You can't "overpower" your Thinkpad assuming it's the right 20V adapter for it. The only disadvantage is it would be larger physically than needed. I like my 65W adapter, it's so small (the advantage being easy to pack).
     
  5. raydabruce

    raydabruce Notebook Carnivore

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    Will the 90W recharge the battery faster than the 65W? I'm assuming it will unless the battery circuitry doesn't allow it.
     
  6. lead_org

    lead_org Purveyor of Truth

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    the 90 watt adapter will charge the battery quicker, it also allows your laptop to run at full cpu speed even without the battery installed. You could also get the 135 watt adapter from the w510, but it is quite expensive.
     
  7. hceuterpe

    hceuterpe Notebook Evangelist

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    lead_org:
    You sure on that? He got a laptop with the integrated graphics. I thought both of those points only matter with the discrete graphics and for larger laptops than the T410.
     
  8. raydabruce

    raydabruce Notebook Carnivore

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    Well, I have the adapter now and it seems to work fine and looks new. BUT, it's not the 40Y7659 -- it's the 42T5000. Both FRUs have identical specs, as far as I can tell, and are recommended for the same models.

    Does anyone know why the FRU number is different? Perhaps 42T is a newer model or from another manufacturer?
     
  9. jnjroach

    jnjroach Notebook Evangelist

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    I bought the Lenovo 90w Power Supply from Amazon Fresh (delivered with my grocery items) new for $30 about 4 months ago. Amazon Fresh and Amazon usually have the same price...
     
  10. lead_org

    lead_org Purveyor of Truth

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    While, i haven't tried the 65 watt and 90 watt test on a T410 or T510 laptops yet, however for the Thinkpads that i have own, the 90 watt adapter do charge the battery quicker than a 65 watt adapter. Regardless of whether it is integrated or discrete graphics.

    The different usually indicate the different manufacturer of the adapter, there are 3 manufacturers for power adapter (Delta, Lite-on, etc).
     
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