You can unplug it and use whenever and wherever you want. Of course, it only makes sense if it holds the charge. Before you look any further, you need to check the basics.
If your MacBook Pro battery is not charging, verify the power cable. Inspect every inch of the cable and look for broken spots or any dark stains on its surface. The next thing you should do is to verify the ports for any foreign objects or debris. Dust can build up in the charging port blocking the connection, so if you find something, use a wooden object to remove it you can use a toothpick. Check whether you are plugged in into the wall socket. Make sure it is turned on or try using a different socket. Just like apps on your MacBook can get frozen, so can the hardware that controls the charging of your notebook.
A simple reboot can reset the hardware and fix the problem. As simple as that! The MacBook battery may wear out faster than expected if you use it intensively.
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If it's indeed the problem, could mean a replacement of your laptop - so check to see if it's still under warranty! Look for any discolorations, burns, or dents inside of the port. If any of these symptoms appear, it could mean your port is damaged. If your port is damaged, take it into a local Apple authorized computer repair store or an Apple store to get it fixed. For MacBook's with a removable battery early and older. If non of the above tips worked, the problem could be as simple as overheating. If the top or bottom of your laptop is hot to the touch, then this could be the culprit.
Just place a fan near your MacBook to cool it down, or simply turn it off and let it be for an hour or two. Overheating can stop your MacBook Pro or Air battery from charging if the thermal sensors within the computer detect a drastic rise in temperature, and shut off access to the battery as a safety precaution. Every laptop has it's own quirks and problems, and at this point it's better for a professional to take a look into the problem as more than likely it'll have to be a unique fix.
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If the power adapter shuts off, interference might be affecting the power outlet you're using. If your power adapter works for a while, but then stops charging, temporarily unplug it from the power outlet. Wait 30 seconds, then plug the power adapter back in. If your Mac notebook starts charging after you plug the power adapter back in, this might indicate an issue with line noise disruption caused by stray electromagnetic signals from your power outlet.
The power adapter automatically shuts off when its built-in voltage protection feature senses line noise from an outlet. Some possible sources of line noise include lights with ballasts, refrigerators, or mini-refrigerators that are on the same electrical circuit as the outlet you're using. Plugging the power adapter into an uninterruptible power supply UPS or an outlet that's on a different circuit can help.
MagSafe Won’t Charge a MacBook? It’s Probably a Simple Fix
If your power adapter continues to turn itself off when connected to a known good outlet, take your adapter to an Apple Authorized Service Provider or Apple Retail Store for further evaluation. Your power adapter comes with a removable AC plug that has the blades you insert into an electrical outlet.
You can find out if this cable is causing your charging issue by trying another USB-C cable. If your Mac notebook charges with one USB-C cable but not another, immediately stop using the cable that doesn't work and get your cable and power supply evaluated. In some cases, software or firmware updates might be available for your computer that improve communication with your power adapter.
The USB-C power adapter can become warm during normal use, so be sure to use it in a well ventilated area. Always plug the power adapter directly into a power outlet using the AC plug, or place it on a table or other well ventilated area when using the Power Adapter Extension Cable sold separately. Avoid placing your adapter in a poorly ventilated area, like on a couch, thick carpeting, bedding, or a pillow.
Avoid covering the adapter with a blanket or other insulation.