Battery questions

Hi guys.

I received my M14x on Monday, pretty fast, just 1 week after ordering. Nice thing But I do have questions regarding the battery.

1) Charging was fast till around 70% (I would say around an hour), but after that it took a really long time till it reached 100% (didn't monitor it but I think it were more than 2 hours). Is this normal or maybe points to a problem?

2) When I first used the M14x AlienAutopsy showed that only 95% of the battery are usable, but a full charge then boosted this to 100%. In fact it even got 65,22Wh (showed by BatteryMon and BatteryBar, but both mention this as full charge capacity as well).
Since I always read 63Wh: Is this capacity normal or is it maybe a new type of battery? I already read a lot here, regarding performance on battery with BIOS A01 (system shutdown) and A03 (limit GPU to around 200MHz). Thanks to all people with the information.

Maybe I should do some own tests? I already downgraded BIOS to A01.


Thanks all!

Regards
Iwan666

 

This is quiet normal for batteries.

 

That is how a modern Li battery works, it charges fast till about 70-75% then trickle charges to 100%. It's because there's a safety feature inside the battery to do this because the battery could possibly explode if it charged to fast, got to hot, and overcharged.

Another thing about the Li battery is it never fully charges, it only goes to 95% to 98% or so. Once again this is to protect the battery from exploding. Cell phones do the same thing, it says its "100%" full but it really isn't but they have to lie a little and make it say 100% because people would be freaking out if it never really hit 100% even though this discharge time is the exact same.

This is all totally normal for Li batteries. You can do any tests you'd like.

 

Thank you for the answers. I think I did not encounter this slow charging on other notebooks (e.g. the one from my employer) but I never really monitored this.
Annoying, but OK. But as I read charging Li-batteries regardless of their current charged capacity is not negative for them (e.g. 1 full cycle after 5x 20% charging) I could charge them to 75% and then use mobile as normal, right? Battery won't suffer from that (of course as I read I should do a "calibration" with 5% discharge and full charge at least once a month)?


Regarding the charged capacity ... so the battery lies to me, interesting Was just confused why the charge is higher than what the battery is advertised (so I wonder why dell doesn't adverstise this as 65Wh battery). So no need to do tests as it is the same battery as everybody has.


Thanks again,
Iwan666