90 vs 65 Watt Power Adapter

Lenovo offers 2 power adapters for the T60. The one included is 90W, but they also offer a 65W adapter on their website.
I travel for work, and live on planes. Has anyone ever had a problem getting the 90W adapter to work on a flight?
Also, why does Lenovo offer the 65W adapter at all? I know that prior Thinkpads were around 70W, but I figure they bumped to 90W for some logical reason.

Any downside to the 65W adapter?

 

I'm pretty sure the 65w is for the older thinkpads.

 

No, the 65w is for airplane travel (airplane outlets tend to trip the circuit breaker with 90w). What the downsides are I don't know, so I would just ask Lenovo.

 

the downside of having a 65w brick is that you charge your battery in normal time, while having a 90w brick makes charging faster.

but take note that the 90w charger runs hotter than the 65w

 

I think the 65w adapters are for models with integrated graphic solutions, and the 90w adpters are for models with dedicated graphic cards.

 

It is significantly smaller and lighter. The downside is that it's hotter and it cannot be used with a docking station.

If it indeed is slower to recharge the battery, that is a GOOD thing because the faster a batter is recharged, the worse it is on battery longevity.

 

The thinkpad charging system is very slow and peaceful for the battery to begin with. Using a 65w adapter when not needed is only going to put a ton of stress on the brick, and possibly damage it in the long term.

My C100 came with the 65w adapter, and if i am charging the battery AND using the laptop at the same time it is horrendously hot.

 

Yep the adapter is almost a fire hazard LOL

Gee my rig charges really fast (at least for the first 90%)... i wish it was more like a trickle charger, for the battery's sake.

 

Well, i just found my answer.

Has anyone accidentally caught anything on fire with the 65W AC Adapter yet?

 

my t61 with integrated graphics came with a 65W brick.

 

No and i use it all the time.

 

wait a minute, does it mean if my laptop comes with discrete graphics card, it should be 90w? 'cos I was given 65w...

 

I have both for my Dell laptop. I got a 65W from a friend for free. I keep that one in my bad and the 90W at home.

Either one will power your laptop. Obviously, the extra power goes to charge your batter, thus the 90W will charge it faster. Even with discrete graphics, you'll be fine with either one

 

I rec'd a new Dell 1530, with a 65W charger, Sep 08. Periodically, I rec'd messages that I had the wrong charger, and why wasn't I using a 90W charger. I called Dell, they changed the 65W out for a 90 W charger; the message hasn't come back.
However, if what you are saying above, 90W is faster and the 65W unit was slower and better for the battery, I made a mistake here.

Also, I notice that while I shouldn't work on the laptop plugged in all the time, when I take the charger out, the display fades. It is workable, but significantly darker. My boss' Dell laptop doesn't "fade" when it is unplugged. In both cases, the batteries are fully charged. Any ideas?

 

I think the display is automatically dimming itself in order to save battery - check the Dell power utilitiy's settings.