Originally Posted by
miegiel
You can't blame that on linux.
It's normal for lithium batteries to loose capacity over time. They even loose capacity while lying on the shelf. They loose capacity faster when they're completely full or completely empty, at 40-50% they loose the least capacity over time. On the up side they don't age faster when you use them a lot. And they don't have a "memory", so you don't need to fully discharge and fully charge the battery to prevent capacity loss.
That's why I bought a laptop with a 6-8h battery life while I only really need 4h. After about 2 years the battery's capacity will be almost useless, though with a energy efficient laptop you might still get 1h of battery life.
that's weird... I've always been told charging and discharging battery should always be done from 0 to 100% to have longer battery life and better battery usage.
Of course, charing and discharging should affect the battery capacity amount...
for example, in my case, after 1 complete discharge and recharge of battery (yesterday) I have now:
Code:
within@within-laptop:~$ cat /proc/acpi/battery/BAT0/info
present: yes
design capacity: 5600 mAh
last full capacity: 5562 mAh
battery technology: rechargeable
design voltage: 11100 mV
design capacity warning: 0 mAh
design capacity low: 0 mAh
capacity granularity 1: 100 mAh
capacity granularity 2: 0 mAh
model number: AS09D36
serial number: 3E30
battery type: LION
OEM info: SSANY
It thus means after only 1 full cycle (discharge/charge), 38 mAh were lost.
Nevertheless, it is a fact that Ubuntu is not perfect for managing power and battery usage; this french article compares on 2 laptops the power consumption with win 7 and Ubuntu 10.04, the differences are sometimes huge:
HTML Code:
http://www.presence-pc.com/actualite/Windows-Ubuntu-consommation-39263/#xtor=RSS-11
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