A lithium ion battery is rated at 3.7V per cell. However, all batteries start above their rated voltage on a full charge, and end up below their rated voltage when they are depleted. For lithium ion, the operable range is roughly 3.2V-4.2V. So a lithium ion battery pack rated at 14.8V is actually 4 lithium ion cells in series (3.7x4=14.8). However, the operable range of this pack is roughly 3.2-4.2 x 4 = 12.8-16.8V. This is why you see the higher than rated voltage, at least at full charge. On Jul 31, 2012 6:22 PM, "Áron Cserkaszky" <[email protected]> wrote:
> People reported 16-16.5V when on battery and 16.5-17V when on AC, so I > guess all batteries are underrated (:)) because specs are either 15V or > 14.4V. > So I just buy a new battery and problem solved, but I still have no idea > why (probably) 2 cells of my battery died with no warning clues. > Thanks for the stats people. > > Aron > > > On 22.07.2012 13:14, Áron Cserkaszky wrote: > > Hey list > > > > I have a two years old UL30VT with the default 5600mAh battery, and the > > battery stopped working now, meaning that it does not even switch on > > when only the battery is present. I did some investigations and the only > > unusal thing is the low battery voltage, instead of the 15V (according > > to specs) acpi tells me that it outputs only 12616mV. (when its in the > > machine but the AC is plugged in too) > > > > Could you run this command for me on your machines: > > cat /proc/acpi/battery/BAT0/state | grep voltage > > and then send me the result? > > > > I would appreciate it, because if your batteries have normal voltage > > then I can rest in peace that the battery is to blame, and a buying a > > new one from amazon will solve my problems. > > Please write me in private and then after a few days I will reply to the > > list with the stats of your answers. > > > > Thanks in advance > > Aron > > > _______________________________________________ > Mailing list: https://launchpad.net/~asus-ul30 > Post to : [email protected] > Unsubscribe : https://launchpad.net/~asus-ul30 > More help : https://help.launchpad.net/ListHelp >
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