x220 - how does the battery lasts in time test? (= not per full charge)

when it starts dying and in which rate?

 

sorry can you explain what you want to know?

Are you saying when the X220 battery start to die?

 

yep
when i'll start consider using battery warranty (is it worth purchase?)

 

Depends on your use, but batteries typically start degrading like 20% after 9 months, and sigificantly after 12-18 months.

 

I must be a really light user. After 1 year and a month of not really taking care of my battery on my W520, it is at 104.46 Wh, with a design of 93.24 Wh or something around there. It has about 15 cycles on it.

My work laptop, a T420s, has 170+ cycles and a full charge capacity slightly above the design capacity, and is more than a year old. I've only had it for a month, so whoever owned it before must have loved using the thing on battery.

 

After more than 3 years, my T500 only has 64 charge cycles (mainly because I use my charge thresholds at 40/95), and lost about 20% max charge. Pretty satisfied with it so far (knock on wood), but in any case, I've basically been using my T500 as a desktop replacement ever since I got my X120e.

Battery degradation will depend on usage, battery cell manufacturer (Panasonic, LG, or Sanyo, I believe), and a bit of luck.

 

I have an X200 with an LG 6-cell battery. The original battery is 3.5 years old with 452 cycles and I still have 95% of the design capacity (53 Wh from 56 Wh). My thresholds have always been 45/80.

I don't know if I hit the magic number, but my X40's 8-cell died around 3 years.

 

I bought my X200 battery (9-cell Panasonic) from ebay back in early 2011. Right now it has 282 cycles on it and shows a manufactured date of 9/2008 with first use date of 10/2008. It has 65.70 Wh remaining capacity of 73.77 Wh. The design capacity is 84.24 Wh which gives it ~87% of its design capacity. From day one when I had purchased it I set the thresholds to start charging at 82% and stop at 90%

This is one good reason why I advocate against removing the lenovo power manager. I have read threads where people feel it is bloatware and want to perhaps shave a second off their boot up time so they remove it. Seriously... I find the benefits the program provides outweigh any perceived negatives therefore I always install power manager.

 

I just adjusted my battery settings after reading this ... Do these settings remain even if the system is powered off or sleeping if you plug it in during that state? I just set 75/90 on mine as I rarely have a need for more than 75% capacity. I do however run frequently for 10 - 15 minutes in battery, and often keep the system in standby when not using it / transporting it...