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c_man
08-06-2012, 08:10 AM
The things I think happens:

The G75 might need some extra power from time to time, the 180W power brick seems on the limit. When this happens the good thing is that Asus did allow the battery to provide that extra power so there are no real problems.

In a session of gaming, encoding, browsing and so on the battery drop will be ~2%, nothing really major.

The interesting part is that the laptop will not charge the battery unless it drops below 95%. This looks to me like a smart charging system.

Have anyone else notice this?

Zygomorphic
08-06-2012, 10:26 AM
Occurs on the G53SX as well, that smart-charging technology preserves the life of the battery. Frequent 3% charge/discharge wears out the battery prematurely, so ASUS is protecting your battery for you. :) I have never had the 150 Watt brick on my G53SX max out that I know of. I doubt that the battery provides power ... then again, Apple did that at one point.

ootld999
01-27-2013, 10:27 AM
Any way of changing the charge thresholds on g75vx? Maybe some bios upgrade or win8 setting? Thanks

Zygomorphic
01-27-2013, 11:18 AM
Any way of changing the charge thresholds on g75vx? Maybe some bios upgrade or win8 setting? Thanks

None that I know of. If you change it up (closer to 100%), you will wear out the battery faster. The battery itself sets those levels, I believe. Lithium-Ion batteries are way more complicated than lead-acid batteries, which the height of sophistication is remembering to top off the cells with distilled water. Lithium-Ion batteries explode if over-charged, explode if charged incorrectly...

ootld999
01-27-2013, 11:55 AM
Im aware of the main li-ion battery specifics. I wanted to lower the charge thresholds, maybe 80% min to 90% max because i still keep the battery in the laptop. Otherwise, i'd have to take it out seeing how i dont travel _that_ much with it. And hence increase the battery life.
I saw that lenovo has some software for doing that.
Anyway, i`ll be on the lookout for any bios/software to do this.

nirO
01-27-2013, 12:36 PM
The things I think happens:

The G75 might need some extra power from time to time, the 180W power brick seems on the limit. When this happens the good thing is that Asus did allow the battery to provide that extra power so there are no real problems.

In a session of gaming, encoding, browsing and so on the battery drop will be ~2%, nothing really major.

The interesting part is that the laptop will not charge the battery unless it drops below 95%. This looks to me like a smart charging system.

Have anyone else notice this?

my G75vw does the same... i see battery drops even if i got it plugged all the time.. and yes it wont charge until it drops to 95% in fact even now its at 99% and wont charge

Zygomorphic
01-27-2013, 07:30 PM
From what I understand, leaving the battery in is perfectly fine, since it just sits idle without charging...essentially the same as not being in the computer.

ootld999
01-27-2013, 11:11 PM
It's not quite the same thing. For example, take table 3 from this link:
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
If the battery is kept at around 30C because of the laptop heat, that means that if it's not used at all, it will have about 75-80% of initial capacity after 1y.
That is if you keep it at 95-100% state of charge (as is the case here, i saw in another thread that the lower limit is 95%).
If you could reduce the charging thresholds to min 'a', max 'b', you'd have a depth of discharge b-a %. That means, by looking at table 2, that if b-a is about 25% (which would be a valid usecase if youre using the laptop while trying to get somewhere and then plug it back in) you'd get 6 times the number of discharges out of the battery. Which is more than the factor of 4x (that is 100%/25% if 25% is the discharge unit). It's obvious that these functions are not linear.
So the thing is, 'b' says how much your battery will last/live w/o heavy usage, and b-a says how many times you could use it. That's why i was asking for some way of being able to specify those 2 numbers.