T400 Battery Usage

Hey guys.

I am currently using my T400 laptop as desktop replacement. It is plugged in 24/7, and the battery charges at below 65%, and stops charging at 95%.

Over a period of about two weeks, it's gone from 80% to 76%. I usually leave it either on, or put it to sleep when I go to sleep.

Should I be concerned about this 3% drop in the battery? I'm thinking of removing the battery as it is plugged in all the time.

 

all Li-ion batteries drain their capacities over time, even when they are not used. with me, the drain speed is about 1% per two days, which is, still higher than you.

this is totally normal, don't worry about it.

 

If it's truly plugged in 24/7, drop the thresholds to 45/50. If you prefer to remove the battery you can do that as well. Discharge it to a bit less than half capacity, put it in a plastic bag with a few air holes and throw it in ur fridge. You will need a 90w adapter to run your T400 with out a battery present (I believe).

 

I respectfully disagree with this method. You'll risk your whole laptop just to save a small piece of your battery

 

Wait. What part are you disagreeing with?

Storing the battery in the fridge? It actually does help to store lithium ion batteries in that way for the long term, or at least somewhere quite cool (ie, in a desk drawer not in the sun). Just make sure you don't use the battery right when you take it out of the fridge - wait for it to get back to room temperature.

Running the laptop on AC only? That doesn't risk the laptop at all, unless you're referring to the work that's open on your laptop in the event of a power outage.

 

store in a cool and dry place is good enough (around 20 degrees celsius).

Don't chuck the battery in a freezer, unless you can remove all the moistures present within the battery compartment (i.e. put it in a container then flush it with pure nitrogen air for 10 minutes), otherwise you would get moisture condensation and form ice/icicles on the internal components.

 

I disagree with him about running the laptop on AC only. The battery is a backup power source for the laptop, and how can we know, what will happen? A power shortage can be no harm at all, or it can harm HDD, or even the mainboard. Who know?

anyway, koreo is asking about battery drain, which is totally normal, and harmless, not about increasing wear level. I don't think he need to store apart his battery.

 

The fact that battery can act as a UPS, is one reason why i hardily use my desktop anymore (i do have a UPS for my desktop, but the battery only lasts 5 minutes once the AC power is out).

Also, the OP is intending to run the laptop without battery, he/she must get the 90 watt adapter in order to prevent the CPU throttling down to conserve power (which occurs on the 65 watt adapter).