moderated Re: battery question

Richard Turner

Here is an article I just found that may be useful, or not, you decide.
The care and feeding of Li-Ion batteries
by William Jones in User Support , in Developer on November 2, 2007, 8:39 AM PST
Lithium-Ion—or Li-Ion—batteries are in everything, and while they may not last forever, they'll benefit from a little tender loving care. This time, five strategies that will help your users get the most out of the rechargeable batteries in their laptops and portable devices.

Device manufacturers categorize batteries as "consumables." They're expected to wear out; it's how they do what they do. The warranties provided by computer companies usually have different coverage terms for a laptop's battery than for the computer's other components. Even if you take the best possible care of your battery, its performance will degrade over time, and I've found that batteries older than two or three years aren't good for much runtime at all.

Accept the fact that your battery won't last forever, no matter what.
Oxidation in the cells can prevent an old battery from discharging properly, so even when left on a shelf, a battery's lifespan shortens with time. That doesn't mean that there aren't some steps that you can take to ensure the Li-Ion batteries in your laptop or cell phone last as long as possible.

Batteries are made to be used, so use them.
Just like couch potatoes, batteries need exercise. The chemicals in Lithium-Ion batteries respond best to regular recharging. So if you have a laptop, don't keep it plugged in all the time; go ahead and let it drain to about 40 or 50 percent of capacity, and then recharge your computer.

The life of a Lithium-Ion battery can be measured in charge cycles. A charge cycle occurs when 100% of a battery's capacity is used. Let's say you use 50% of your laptop's battery one day, charge it overnight, and then you use 50% of the battery again the next day. Even after charging it back up again, you'll have only had one charge cycle occur. Most laptop batteries are rated for a useful life of at least 300-500 charge cycles, but high-quality, properly maintained batteries can retain up to 80% of their original life, even after 300 cycles.

Periodically calibrate your battery.
Most batteries that have a "fuel gauge", like those in laptops, should be periodically discharged to zero. This can be accomplished simply by letting your computer run until it reports a low-battery state and suspends itself. (Do not let your computer deep discharge, as I'll explain in the next item.)

The gauge that measures the remaining power in your laptop is based on circuitry integrated into the battery that approximates the effectiveness of the battery's chemical compounds. Over time, a discrepancy can develop between the capacity that the internal circuitry expects the battery to have and what the battery can actually provide. Letting your computer run down to zero every month or so can recalibrate the battery's circuitry, and keep your computer's estimates of its remaining life accurate.

Don't practice so-called deep discharges.
Most laptops will suspend operation if the battery drains too low. Even if your computer goes to sleep, though, most batteries that are in good working order will still have a reserve charge available. This reserve will hold the computer's working memory in state for a little while. A deep discharge has occurred when even that percentage of reserve power is used up. The computer will have turned off completely, and sometimes you'll notice that it will have lost track of the correct date and time. Deep discharges will strain your batteries, so try to charge them frequently.

Avoid exposing your battery to heat (when possible).
Heat can overexcite the chemicals in your battery, shortening its overall lifespan. In fact, it's been speculated that the biggest cause of early battery expiration is the heat that batteries can be exposed to when they're stored in computers that are running off AC power. Laptops -- especially modern multi-core machines -- can get very hot when they're plugged in, easily over 100 degrees Fahrenheit. That's hot enough that extended exposure will negatively affect your battery. If you want to be really protective, there's nothing saying that you can't pop the battery out of your laptop if you're going to be within reach of a power outlet for a while.

There may be times that you can't help but expose your laptop battery to heat; you may live in a warm climate, for instance. You can, however, try and avoid exacerbating the issue. Make sure your laptop is well ventilated and that you're not operating it on a surface that retains heat, even when you're not plugged into mains power.

Store your batteries properly.
If your laptop or portable device isn't going to be used for a while, you should remove its Lithium-Ion battery, if possible. Even if the battery can't be separated from the device, it should be stored in a cool environment at about one-half charge. Cool temperature is recommended by experts because that can slow the natural discharge that batteries will undergo even when they're disconnected from their device.

I've seen some people go even further and recommend that spare batteries be stored in the refrigerator. I don't think this is a very good idea; I'm concerned about condensation that might build up. Don't put your batteries on ice, but keep them out of the sun.

Ultimately, I believe that buying spare Li-Ion batteries is a losing game, because the batteries start degrading as soon as they're manufactured. Usually those spare batteries spend most of their time sitting in a charger, losing useful life. If you need to be really mobile, you're better off purchasing an adapter cable you can use with the power sources available in planes, trains, or autos. And, of
course, by taking good care of the battery you already have.



Ralph's Observation: It is a mistake to allow any mechanical object<>to realize that you are in a hurry.

My web site,

-----Original Message-----
From: <> On Behalf Of Glenn / Lenny
Sent: Tuesday, March 2, 2021 4:46 PM
Subject: Re: battery question

I think that when they are plugged in all the time, the device manages the battery properly.
I had a Dell laptop on a docking station at work, and rarely got taken off the dock, and when I did, the battery did well.
For example, Humanware recommended, with the trekker breeze, to keep it plugged in all the time by the window to maintain the connection to the satellites.
The nickel cadmium, and possibly the nickel metal hydrates as well had what was called a memory, and if you didn't discharge them all the way, they retained the partial charge getting to full as the capacity of the battery.

----- Original Message -----
From: "Randy Barnett" <>
To: <>
Sent: Tuesday, March 02, 2021 6:34 PM
Subject: Re: battery question

This is not true anymore. Lithium ion batteries dont have a memory. It is just the opposite.Keeping a Lithium Ion battery at 100% all the time is not good for it.

On 3/2/2021 3:46 PM, Soronel Haetir wrote:
And note that this whole thing is a bad idea, Each time you run a
battery low (even if not to 0) the less charge it will be able to take
and so you will get less running time. Much better to run plugged in
if that is at all possible.

On 3/2/21, Mike B <> wrote:
There's a little program called Stascom that you can run in the
background that yu can set to notify you of every 20% decrease of
battery useage.
It'll also notify you of battery charging in 20%increments.

This little program has all kinds of neat features but, the one I
like the most is you can set it to automatically maximize whatever
window that comes

into focus. Check it out below.;data=04%7C01%7C%7Cd1dbbb70

What to know before installing the program

Please refer to the user guide, see the link further down, for

instructions. It is recommended that users of older versions of the
program familiarise themselves with the changes implemented in

Automation for the following tasks, all features customisable list of
5 items • Sound recovery on default audio device, preventing mute
status and low volume. Recovery volume level configurable between 5
and 100 percent; • day / night volume adjustment on a schedule,
volume levels and time slots

• maximising of windows, option available for specifying window title
exceptions; • time announcements on the hour, on the half and on the
quarter hour, chime

with speech, chime only or disabled, all 24 hours configurable.
Option to specify user preferred chime sounds; • all automated
functions can be enabled or disabled, with detailed configuration
options available to suit individual needs.
list end

Individual hot keys for the following features list of 10 items •
Open user guide in default browser; • generate summary report of user
settings; • configuration window to specify user specific preferences
for all features; • temporarily unload program from memory; • audio
mixer input and output details; • password generator, unique 10
character very strong password with each keystroke; • calculation of
word count on selected text in any editor or virtual buffer

rendered text;
• extensive alphabetic list of Windows basic and advanced settings
and applications; • Increasing and decreasing master volume output
with 5 percent increments,

ascending / descending audio tones to indicate new level.
• Easily insert accented and other special characters in any editor.
list end

General program characteristics
list of 9 items
• Automatic online check for program updates, can be disabled if desired.
Manual check for updates option available; • support for multiple
user profiles on one system; • status messages and time announcements
via user preferred SAPI5 engine; • user-friendly interface for
changing SAPI5 voice parameters; • support for same SAPI5 engine used
with screen reader and program messages; • optimised for NVDA screen
reader; • included dictionary file for NVDA to translate emoji
symbols; • small footprint; • comprehensive user guide in HTML
list end

Stay safe and take care. Mike.

----- Original Message -----
From: Richard Turner
Sent: Tuesday, March 02, 2021 10:57 AM
Subject: Re: battery question

Jaws won't tell you unless someone has written a script, but Windows
can alert you if you go in the sound scheme settings, and make sure a
sound file

that you can actually hear is connected to the appropriate events,
like Critical battery and I think there is a low battery.
You just need to go through the events and find the appropriate ones
for your needs.


"You know," said Arthur, "it's at times like this, when I'm trapped
in a Vogon airlock with a man from Betelgeuse, and about to die of
asphyxiation in deep space, that I really wish I'd listened to what
my mother told me when I was young."
"Why, what did she tell you?"
"I don't know, I didn't listen."
-- Douglas Adams, The Hitchhiker's Guide To The Galaxy

On Mar 2, 2021, at 10:51 AM, JM Casey <> wrote:

I'm not sure about jaws specifically (I only use NVDA on my laptop)
but Windows should tell you when your battery is low. It may not
give you a
*huge* amount of time/warning. Mine doesn't -- it's an old Lenovo
Thinkpad and I even got a supposedly fresh battery for it, but never
have I ever gottren satisfactory battery life out of the thing.

-----Original Message-----
From: <> On Behalf Of Madison
Sent: March 2, 2021 01:47 PM
Subject: battery question

Hi all,
I've decided that I should start using my laptop unplugged and only
charge it when I'm not using it, and well I know how to check the
battery power I'm wondering will Jaws tell me when my battery is
getting low or will I just have to keep checking? I'm using the
latest Jaws and Windows 10. Thanks Madison

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