Does battery reset really increase the capacity?

my 9 cell battery is 1 year old, with 39 cycle count. the real capacity was 67.82/84.24 Wh. I did a battery reset last night, and this morning I found that the "full charge capacity" has increased to about 82Wh, this is too good to be true! I can't believe my 1year old battery has almost the same capacity like new!

I guess, the reset just calibrates the battery meter, it does not increase the real capacity, just the posted number increased.

any thought?

 

actually the calibrated charge capacity is pretty much your real charge capacity of your battery. Most capacity decrease when it is recalibrated every so often, but sometimes they actually increase depending on the condition of the battery cell.

 

thx!

my battery capacity was under-estimated before the recalibration, right?
actually it has the 82wh capacity, but the meter read it as 67.82wh.

so the reset didn't "increase" the capacity, it just corrects the inaccurate read?

 

yes something like that.

It has actually calibrated the battery so that the laptop knows it's maximum capacity and charges it accordingly.

 

I had my friend's battery gauged once, and it capacity dropped from 72Wh to 69Wh. Gauge reset only calibrates the battery, then software read battery's capacity more accurate. In other words, it can increase or decrease the capacity, all depend on your battery state.

 

It's generally recommended to recalibrate batteries once every few months for their best performance and lifespan.

 

Especially if you aren't using it too much. I've found that if you are using the battery on the go a lot and actually draining it that the calibration actually isn't really needed.

Example: I hadn't done a calibration for a good while, and then went on travel where I used most of my batteries capacity several days in a row. On getting home I ran a calibration and the before/after was near spot on.

When I go a long time without using it much or just doing small drains though I find it will drift a bit and the calibration can make a difference.

 

the recalibration may not be needed if you constantly charging and discharging fully, but most people don't do that.

Most of the charging behaviour are what some people call top up charging. This is where the battery gets drained to about the 60 to 70% and then recharge to 100% (just an example). This mean the battery never go through the whole battery charge cycle.

Calibration is basically where the battery gets charged up to full, then fully discharged and recharged to full again. The electronics circuit just reads the battery charging behaviour and other parameters, and then give you an accurate estimate of actual battery charge capacity.

 

Does it still hold true that it is generally a good idea to have the battery thresholds set at 35% - 45% if you don't use the laptop on the go too often and it is mostly plugged-in?

 

Battery maintains its longest longevity when stored at 40 to 50 % charge level.

 

Basically we recommend not topping it off repeatedly as well...