94% on a 18 month old Dell latitude (AC plugged 99% of the time)
A tip that has worked for me: if you nearly always use a laptop with AC plugged in, to preserve the battery you may as well unplug the battery (if possible) and use the laptop only on AC.
Most of the time my laptop is like that: only on AC, and no battery connected.
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Thanks @ReemZ and @Kresimir . I don’t run commands without knowing what they do. This has led me learn new things. Earlier I was the kind of linux user who always copy pastes commands from the web.
And yes I’m sure that this forum won’t let a thread continue which suggests executing some malicious command 
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Unfortunately most newer laptops have integrated battery like my new one. 
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I set charge stop at 85 and charge start at 50 in my bios settings. So when the battery charge is between these two numbers, it doesn’t get any more charge. If the power cord is plugged in, the laptop will work on AC automatically. If the power cord is unplugged, laptop automatically falls back to battery.
I’ve been using my laptop this way. Since the past two days, the battery % is at 79. I run it for 7-8 hours a day. Classes are online, from home, so need need to waste charge cycles. I do discharge and charge once on weekend though.
Removing the battery is difficult. The back is screwed, and the battery is most probably non removable. With battery removed, I run the risk of losing data on power cuts, which does happen even in a good locality of the capital city of the country.
I’m not so sure everyone has these settings in the Bios.
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I have a Dell.
If the settings are not in bios, tlp might give some success on this.
I haven’t tried this out, so cannot guarantee if it will work. I use bios settings.
better not to do that, it would be good to empty the battery some times at least one time 
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but… it is your hardware, open the case and replacing what ever you want, soldering some new parts inside change the wlan device… unsolder the camera ( 
)
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The charging thresholds only work on some Lenovo models, AFAIK.
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No solder for me. That can get messy and usually i end up getting burned!
Integrated battery is almost never soldered (at least I’ve never encountered such a thing, and I am a big fan of disassembly videos 
). there’s always some connector of some sort that can be disconnected from the motherboard.
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Soldering is not that bad. Once you learn how to “tin” a wire it is way easier.
Sometimes when you are a kid you also get a tin ear! 
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