My macbook pro keep shutting off when it drops to 50 percent then goes back to 90 after 2 mins of charging shutdown code -11

If the other measures do not work, then your symptoms suggest a failing battery. Apple still provides battery service for 2019 Macbook Pros:

From this support page: Mac Repair and Service - Apple Support

IYK1 wrote:

According to the macbook, my battery life is normal and I only have 110 cycles on it.

The behavior you describe does not sound normal. Shutting off when it reaches 50% ... etc. I would think it is most likely a battery replacement is needed here. Just because it has only 110 cycles, it's an old battery and they wear out over time, even if not discharged much. I have a 2019 16" MacBook Pro and its battery shows 86% capacity, Apple considers it time to replace when it reaches 80% original capacity. So mine has used up more than 2/3 of what Apple considers its useful life. But mine has only 97 cycles, even less than yours (because I have it connected to a charger most of the time). 97 (or 110) cycles would be about 10% of the 1000 cycles it is rated for. Batteries degrade over time, even if not actively used.

You could also have a bad cable but I can't see how a cable would know when a battery is at 50% and then cause a shutdown. I think most likely a power supply (charger) gone bad, or battery gone bad (see Allan Jones' post regarding what a battery replacement costs for that model). We have maybe half a dozen 96W chargers around the house here so it is easy for me to check whether a charger is good or not, don't know if you can borrow one to test yours. Maybe best course of action is to take both the laptop and charger to an Apple Authorized Service Provider and ask them to identify the root cause and provide an estimate to resolve. A new charger would be about $80, much less than a battery replacement. But you need to fix the right thing or the problem will persist.

Frankly, as the owner of the same MacBook Pro 2019 model (plus my "museum" pieces: a 2015 iMac, 2013 MacBook Air, and 2010 MacBook Air) as well as some newer Silicon Macs ... I would question whether it makes sense to spend hundreds of dollars on this laptop. It's an Intel chip Mac, those Intel chips are vintage or obsolete now, it can never by updated beyond Tahoe, and it is 10x-20x slower than new Macs. But if you are like me, you will probably make the repair and run it until it no longer runs ...

It resets the internals on the power adapter...

if your SMC reset did nothing,

try a SafeBoot Start up your Mac in safe mode - Apple Support then Reboot  as normal and test.  Caches get rebuilt automatically

Hi,

Try to check your MacBook Pro with Apple Diagnostics if it reports anything hardware relayed error.

Use Apple Diagnostics to test your Mac – Apple Support (AU)

If your MagSafe cable or power adapter isn't working

Unplug all cables and the power adapter from the wall, wait 60 seconds and then plug the adapter back in.

If your MagSafe cable or power adapter isn't working - Apple Support

IYK1 wrote:

Honestly I might just buy a new macbook because now that you mention it, It is old. But I am also curios if switching the battery would be the fix of this problem. I'm kinda stuck on deciding because frankly I'm broke. I'm a college student. I need a fast and well running computer but would like to stick to macbook.

Most likely a bad battery. A battery replacement is about the only repair I would even possibly consider for an Intel Mac, but it would not be an easy choice.

Since your laptop appears to be a MBPro 15" 2019 model, it can only run up to macOS 15.x Sequoia which will lose support near the end of 2027 which will be when many common third party apps will also stop updating on it which will sooner or later cause apps with online services to fail once the online server component changes enough to break the older app on the older OS. This means you probably have two good years left until you begin to worry about when the online components will begin to break....assuming the laptop has no other hardware issues develop in that time. Offline apps will continue to be fine until the hardware fails. Is it worth it to you for the $250 battery replacement given this information? Only you can answer that question since your current financial situation can play an important part in your decision.

If it is a 16" model, then it is easier to say no to a battery replacement even though it would have support for Tahoe until near the end of 2028. Yeah, I know that doesn't quite make sense.