Re: laptop battery cycling

[Doug <dmcgarrett@optonline.net>]

On 05/27/2012 09:57 PM, Scott Ferguson wrote:
> On 28/05/12 11:37, Robert Holtzman wrote:
> > For the record, I'm running a Lenovo T420i with a 6 cell battery.
> >
> > In the past I've been told that it's bad practice to run a laptop on
> > AC with the battery installed because it would cause reduced battery
> >   capacity.
> Your Li-ion battery will have a longer life if it's stored in a well
> sealed plastic bag in the 'fridge with a 40% charge than on constant
> maintenance (trickle) charge plugged into the laptop. Take it out of the
> 'fridge and fully charge prior to using. Keep it in the 'fridge state
> when running on mains.
/snip/

I've often wondered, after reading this advice time and time again:
how do you determine that the battery has a 40% charge?

--doug