You may have noticed that sometimes you cannot turn on and start the MacBook Pro when a battery is not installed. Let's say you had to remove the battery from an older MacBook Pro because it was swelling or the battery failed for another reason, but when you power on the MacBook Pro, nothing happens. (To be clear, this article is aimed at older MacBook Pro model years, such as a 2006, 2007, 2008, 2009, 201
In this case, if a battery is removed or completely dead and you are trying to start the MacBook Pro, nothing happens – there is no sound, no system startup, no boot clips, nothing. It turns out that some model year MacBook Pro computers do not start up with a simple power button press after the battery has been physically removed or disconnected.
Of course, if you have a replacement battery, you can typically just replace the missing battery with a working battery and the MacBook Pro will start, but it's not always an option. So let's discuss how to start up an older MacBook Pro when there is no battery at all.
How to start MacBook Pro without battery installed
We assume that the MacBook Pro has no battery installed in the computer, which means it is physically no battery installed. Then nothing happens when you try to start your Mac or press the start button. In this case, you can force the MacBook Pro to boot by following these steps:
- Disconnecting the MagSafe power cable
- Hold down the Power button for 10 seconds and continue holding it down
- While still holding the power button , plug the MagSafe power cable into the MacBook Pro and continue holding the power button for another 10 seconds
- Delete the power button, then press the power button as usual to turn on the computer and launch the Mac
When the MacBook Pro starts, the fans will blow at full speed all the time you use the Mac (resetting SMC or PRAM does not stop the fans running, just replacing the battery).
It also seems that the MacBook Pro will reduce its own clock frequency in this situation, thus reducing performance.
The only way to stop the fans from running at full speed and returning the clock speed to normal performance is to install a new battery in the MacBook Pro.
I experienced this scenario on an old MacBook Pro 2010 model after removing a swollen battery. Once the battery is removed, you can press the power button, but nothing happens. But the above-mentioned method of disconnecting and reconnecting the MagSafe while holding the power button was successful when you started your Mac, with full-speed and reduced-speed fans. Nevertheless, Snow Leopard is still running well!
As you can see on the screen below, the "No Battery" indicator is visible, but the MacBook Pro is booting and working.
And in fact, this particular MacBook Pro has no physical battery installed that you can see internals in this image:
Power up your MacBook Pro after replacing the battery, Logic Board, hard drive, RAM, etc.
Apparently, the same mentioned scenario in MacBook / MacBook Pro cannot boot when replacing other internal components on this older model year MacBook Pro (2006, 2007, 2008, 2009, 2010, 2011, etc), including replaced logic boards, internal hard drives, RAM, battery, and perhaps other hardware components.
With some other internal component replacements, sometimes the MagSafe adapter can plug in and hold the power button for 10 seconds enough to get the MacBook Pro started.
Also check the power adapter wattage
For what It is worth, in some scenarios where the battery appears dead but not really (that is, the charge is long drained, but the battery itself is not completely useless yet), then you can maybe start your MacBook Pro with the right water quality MagSafe power adapter at 85W. These older model years MacBook Pro computers use 85W power adapters, while the MacBook and MacBook Air in the same generation used 60W power adapters. Sometimes you just plug in the proper power adapter for power supply, so your MacBook Pro can boot.
This MagSafe power expression button was found on the iFixIt forums, and it worked for me, so if you're in a similar scenario with an older MacBook Pro, try it for yourself. If, for any reason, the above method does not work, the original forum post specifies the following possible solution by moving a RAM module to another slot (if applicable):
"If it does not work, try removing a RAM memory [module] and swap places and [repeat] method "
In my case, this juggling of the RAM module was not necessary to start the MacBook Pro (a 2010 model year) without battery, but the extra tidbit can
This the article is obviously aimed at older MacBook Pro hardware, but it may also be relevant to other older MacBook models, including similar model years (2006, 2007, 2008, 2009, 2010, 2011) MacBook and MacBook Air, and perhaps also some newer MacBook Pro models. By the way, if you rock an older Mac and want to speed up, check out these tips.
Of course, newer model years MacBook (Pro & Air too) hardware does not have easy-to-use batteries and in some cases the battery is glued to the top case, so the ability to end up in a situation where the computer does not have a battery is much less likely and any troubleshooting scenarios will be much more extreme requiring a more thorough hardware repair that is far beyond the scope of this particular article. In such situations, take your Mac to a certified Apple Repair Specialist or an Apple Store instead.
Free the old Macs! Is this eligible for retro status yet? Probably not … give it a little longer.