Stan Brown wrote:
On Sun, 24 Feb 2019 21:30:55 +0000, J. P. Gilliver (John) wrote:
Given that fully charged is I think 107 minutes

Time for a new battery, methinks. Even the absolute worst batteries
get 2 to 3 hours when new, and significantly longer times are not
uncommon.

My Asus laptop got 8 hours or more on a full charge when it was new,
and it still gets around 6. (I don't keep careful track, just plug it
in when it ells me to -- and that's at 10%.)

It depends on whether your laptop is a "brute" or not.

On the Asus thing with dual MXM in SLI, that
gets less than 20 minutes or so. And it's recommended
when gaming with it, to just leave the (two!) power
adapters plugged in. It's not really meant to be
"mobile" as such.

A 10 hour battery life is possible if your CPU
has a 2W SDP. More power is wasted on I/O and display,
than on the CPU in such cases.

Two hours might be a good median for a commodity
laptop, but there's no way of predicting with
any accuracy, what some random laptop should offer.
Some laptops for example, have two battery pack models,
one with more cells than the other, so the number
on those depends on which pack type is installed.

The best metric, is to collect statistics under controlled
conditions when the thing is new. Then compare battery
life later, to that figure.

Paul