... Will something blow up or will it simply deliver 65 watts (no battery charge) to my MBP? I am going to Japan and would love some movies on the plane. 
Got a tip for us?
Let us know
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
65 watt power inverter to an 85 watt MagSafe?
- Thread starter Kingsly
- Start date
- Sort by reaction score
I once connected a 65W adapter to my MBP and it worked fine.
But long term usage... nobody knows
Power inverter may overheat and catch fire, but that's the worst I can think of. Any engineers on this thread?
But long term usage... nobody knows
Power inverter may overheat and catch fire, but that's the worst I can think of. Any engineers on this thread?
I think the issue with the 65W one on an MBP is that it can't keep up with peak demand and so might not keep it charged. However, I've got a 65W one upstairs for my MB and have used it on occasion to charge (not while being used) my MBP, with no harmful effects.
The main thing I am wondering is if a 65watt inverter will:
A) deliver 65 watts and not a drop more, thus forcing my 85 watt magsafe to run on 65 watts, or B) reacts adversely to a stronger current draw than it is capable of, either bursting into flames or, preferably, shutting down.
A) deliver 65 watts and not a drop more, thus forcing my 85 watt magsafe to run on 65 watts, or B) reacts adversely to a stronger current draw than it is capable of, either bursting into flames or, preferably, shutting down.
I haven't timed them, and so it might, but I didn't notice any particular difference (but, then again, I might not have - I tend to charge overnight). I do know that the 85W one is officially blessed for use on both, whereas the 65W one is officially just for the MB.
This was a common question pre-MagSafe too. Using a lower rated adapter/inverter/whatever will simply supply less than necessary, so it will take longer to charge than if the supplied adapter/whatever was used. I suppose that in cases of extreme power usage, it might need to use the battery a bit too.
85 w on my macbook
my cord for my macbook broke so i purchased the 85 w for the pro it will not charge my laptop in any way if i plug it in the led stays green but will never change and charge my laptop. why is it doing this do i need to change any settings?
my cord for my macbook broke so i purchased the 85 w for the pro it will not charge my laptop in any way if i plug it in the led stays green but will never change and charge my laptop. why is it doing this do i need to change any settings?