5% Battery wear after a month of receiving the laptop - Normal ?

Heat from what? The battery overcharging? Because technology's come a very long way to overcharge a battery now.

 

Just completed Recalibrating my battery, the wear dropped from 7% to 2.56%

 

nice dtgulab did you do it per my instructions or another method?

 

Right. Most laptops will do this. 95% is pretty standard. This way even if it's plugged in, it will take a while for it to drop to 95%. Some machines let you configure % for recharge, and others let you turn it on and off on command. That's the best way, really. Too bad more laptops don't offer that flexibility. But again, it doesn't extend the life of the battery by a whole heck of a lot.

 

Right! Such fears are based on older battery technology.

Agreed

Right. Modern laptop battery systems are much better managed than older ones.

This is not good advice. This is the only hitch in an otherwise good post. Manufacturers of Li-ion batteries strongly recommend against such extreme discharge.

 

There is circuitry inside the battery that keep tabs on battery temperature and voltage. It shuts off the battery when the voltage sinks below a predefined limit, to prevent a deep discharge, which can destroy the battery.
Leaving the PC in the BIOS will eventually cause the battery to shut down to protect itself. However, if one does not recharge the battery within a reasonable timeframe, the protection circuitry will bleed the battery to death by itself.

So, IMHO, the tip holds. Leaving it in the BIOS to empty the battery won't deep discharge it.

 

That is a very good/valid point to consider. That is an extreme case. Typically just running to 5% and then shutdown is adequate. But if you have battery or calibration issues, many manufacturers will recommend this procedure. And yes, as ximinez states, the battery has protection circuitry. If you left your laptop to sit for a week or two, it might comletely deep discharge and never recover. But if you're calibrating, don't do it before you leave on a two week vacation!

 

Mine is about 9 months old, and it has 18% wear. Should I ask for a replacement?

 

I'm hoping that's a joke.

 

I'm sure it is not, but again, why do we make these threads if we have no silly questions to ask every once in a while toronto?

No, you cannot get a replacement if the battery shows that it's worn, only when the battery shows death will you get a replacement.

 

Most importantly, we've established that these "wear" percentages aren't even accurate.

 

Similar

But instead of making it switch off, just started it in bios and let it run its course

worked like a charm

P.S. : Have your cooling pad connected during that speeds things up

Indeed we have proved that.

Just for the purpose of recalibration (i.e. once a few months should be fine) - regularly doing so would definitely harm the battery

 

Yes but there must be a reason why Lenovo and Vaio provide battery management software that keeps the maximum battery charge at 80% when your laptop is plugged in.

As per my understanding - 2% to 2.5% wear per month (depending on your usage) is normal - that number is not conclusive, but after looking at the wear posted by a lot of people, it seems to be a good average (mathematically mode would be the right term)

 

2 to 2.5% per month!? That's like 24-30% a year? I don't think so. If you drain your laptop battery near fully 3-4 times a week, yes I can believe it. But if you're plugged in most of the time absolutely not. As many laptops as I've owned and used I've never had one go more than 20% in a year and that was one that I drained to hibernate at 7% on a regular basis.

As far as I know, the 80% is a user configurable amount in BIOS or through software, not limited to the 80% only. Again, it will extend the life of the battery, but only by a little bit. If you want to extend the life of your battery a few months, that's your prerogative, and if they make it easy to do so, then great, no problem there. But if you just use the battery without paying much attention, it won't make any significant difference. It's not like you'll gain an extra year or even six months by carefully tendering your battery.

Many laptops will charge to the artificial 100%, then it won't charge until the capacity drops to at least 95%. So if it's plugged in all the time, it could be weeks before the capacity drops below 95% and it charges again.

 

dude u have no idea LMAO, i was playing a 1080p video, running prime95, running speedfan, had 4 of the HDMI plugs occupied (1 mouse+cooler, 2 HDD's and 1 phone getting charged. Video brightness maxed out. wiped my battery clean in no time lol.