Can i use 45w magsafe with macbook

Improve this question. Quentin 3 3 gold badges 5 5 silver badges 15 15 bronze badges. Christopher Jon Mankowski Christopher Jon Mankowski 4, 13 13 gold badges 54 54 silver badges 89 89 bronze badges. I've used her charger a lot and she used mine, no issues so far 4 months in and battery charge capacity is the same. My MacBook Pro takes longer to charge with her charger, though.

Add a comment. Active Oldest Votes. Here is the information , straight from Apple:. Improve this answer. Justsomeguy Justsomeguy 1, 7 7 silver badges 4 4 bronze badges. I have used a lower wattage charger such as 45W to power my MacBook Pro. The adapter overheated and actually burned out. I brought it to Apple and they denied the problem. I said I saw an Apple page saying there won't be any issue, but they insisted I should use the exact wattage.

When I use a lot of power on my MacBook Air default 45W charger , wire gets hot and after years insulation on the wire cracked, I can only assume this is worse if you power a larger mac with smaller wattage charger. You have 2 scenarios as I see it: 1 Using a higher rated power supply than the original unit. There are 2 points to note here: Although it isn't stated in obvious terms, the 45 W or whatever rating shown on the power supply isn't necessarily accurate, it is in fact the guaranteed minimum continuos rate that it can supply.

Pang 5 5 silver badges 8 8 bronze badges. Well written. Worry about the voltage part guys, rest things can be fine. In layman terms, voltage is force and ampere is volume. Higher volume is okay, you'll just take what you want. But higher force can blow you away. The MagSafe charger changes its output voltage to match the attached computer's needs. Elliot i think you may have misinterpreted that article, it states that there is very little communication between the charger block and the connector so i dont see how it could modify its voltage on demand — diachedelic.

Relevant quote: "charger switches to full voltage By my understanding of the USB PD Power Delivery spec, you don't actually have to worry about the voltage difference when going from a bigger charger to a smaller device. The charger switches voltage based on the wattage pulled by the device. The MBA only draws enough power for the 20 volt charger to switch up to the 15 volt range.

Gory details for the EE inclined: digikey. Show 1 more comment. Maega Maega 31 1 1 bronze badge. So is it safe? I'd say yes. Is it good? Not if you run it at max power.

Sherzod Sherzod 3 3 bronze badges. Pratap Pratap 39 1 1 bronze badge. Taylor Fatherree Taylor Fatherree 1. Sounds like the tech make up an excuse to not RMA a faulty battery : — Navin. What would this mean for the Thunderbolt Display? It has a MagSafe connector and appears to be intended for all Mac types Good question.

I'm not sure. My best advice would be to treat it like finding wild mushrooms: unless you're absolutely, totally certain, about what you're doing, leave it alone. Like I said, I've been adventurous before, and later wished that I hadn't been. This power adapter recharges the lithium polymer battery while the system is off, on, or in sleep mode.

It also powers the system if you choose to operate without a battery. See this article for more details about choosing the right one. Knowing which specific Mac model you have is important.

If you are running OS X Lion Your Mac model and generation will be displayed. If you are running an earlier version of OS X, you can enter your serial number here to find out which model you have.

Rates as of April 1, I am normally using the original one 85W MagSafe 2 Power Adapter but I just want to know that the computer will charge correctly and that the battery won't be hurt. Charging takes a little longer than with the original power adapter. I recommend the 45W adapter for travel. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

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