Disable battery charging?

Yeah, same for me. Now I'll just have to divert my thoughts from the idea of the battery stealing away from me my whole pc >< Thank you for the explanation anyways. Been wondering about this for some time.

I thought that even though there is a chip that blocks a fully-charged battery from being charged further, having a laptop on AC all the time will still damage your battery, since the battery will drain just a bit every so often and that bit is enough for the chip to allow charging again. so you end up using the battery 1%, then recharging that 1% and then using it again and recharging it again and so on... (which is bad... I think)

Well, they might not include a switch because then they can sell you a replacement battery for $90.

My new Dell XPS L502x has Dell Battery Meter software which allows you to turn off battery charging until the system is rebooted.

Just like your camera batteries...you don't have to actually use them for discharge to occur....they will constantly be discharging while sitting there doing nothing. As stated above, your system will be constantly topping off the battery. I believe a charge cycle is a charge cycle whether you are topping off 3% or 93%.

Batteries are my speciality :) having/being an Rc car racer, airsofter and various other intrests involving a lot of battery guff.

When it comes to laptops i always advise to cycle batteries, from fully charged to almost flat, and then place one charge again.
I will never leave one on charge for extended periods of time with the battery in place.

Yes its true that Li-ion batteries do not suffer from battery memory, and can be charged from an state of charge, BUT they do have a life time charge limit. Be it 1000+ charges and then you may see a deterioration.

Li-ion do have very slow self discharge, so most would assume a fully charged battery will stay so, meaning the laptop will stop charging it.
However a charger will never charge the battery to 100% and the treshold for charging or not charging maybe minimal, so any discharge will result in a small and brief charge back to that threshold.

I have proved this point with many experiments and seen the effects on laptops that I fix.
The last proof I had was a laptop I bought and owned for 2 years, and then sold to my dad. At the end of my ownership the battery would still last around 3 hours.
After owning it 6month and my dad leaving it on constant charge it would hold about 10mins, and now less than 20seconds lol.

Through not to careful cycling, I can still squeeze 6-8 hours out of my macbook a year after I purchased it, and that's still on par with it being brand new.
That's the badgers guide to health laptops lol

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If you do NOT use a battery for a long time it is best to store it in a fridge at about 65% charged.
Samsung charges the battery in their laptops to only 80% and keeps it there. A higher charge is not possible when the battery is in the laptop. It increases the life time of the battery.
It is best not to charge the battery till it is really necessary since the number of charging cycles determines its lifetime. So it's counterproductive to charge a battery each time you get a chance and then have to continue running the laptop on the battery because you are going out again with the laptop, only a few minutes after charging. But who knows beforehand how long a power socket will be unavailable or how long you will need the battery?
These are optimum conditions ............ but who can stick to those?

All modern laptops use lithium-ion batteries. Li-ion batteries will explode if overcharged. Every laptop has a charge controller that will stop charging the battery when it is full so the battery won't explode.

Li-ion batteries are rated for a specified number of complete charge-discharge cycles. Intentional discharge cycles will reduce the life of a li-ion battery.

Only nickel-cadmium batteries need occasional complete discharging to maintain their performance. Ni-Cd batteries haven't been used in laptops for around two decades now.

I realize that this particular subject matter is old but after scratching my head, pulling my hair out, going through all the different solutions, including in the BIOS, I used a little common sense and checked the connection between my power cord and the adapter. It looked and felt like it was a solid connection but I pulled apart the connection and reconnected; problem solved. This was, in my case, the solution. It may not be the solution for others.