Battery charge limiting

[Ian Smith]

On Tue, 18 Oct 2011, Dmitry Kolosov wrote:
 > Is there a way to limit maximum battery charge level in FreeBSD?
 > As for common notebook battery usage recommendations - the best way to prolong 
 > your battery life is to install and use software (available on windows), that 
 > limits maximum charge level on about 80%, not giving battery to charge full. 
 > so, it possible software-way, depending on (?) battery's controller. 

I've never heard of such a theory as limiting charge to prolong battery 
life, not with Lithium Ion batteries anyway; nor have I ever seen any 
such as a BIOS option.  'Common' on which brand/s of notebooks?

Can you provide any links to articles discussing this?

I don't think control over a notebook's charging is possible in FreeBSD; 
this is usually managed by an Embedded Controller and ACPI merely passes 
on the the states reported by that and by the battery itself.

cheers, Ian