Re: best protocol for carging a Laptop Battery


"JohnO" <johno@!NOOSPAM!heathkit.com> wrote in message
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"M.I.5¾" <no.one@xxxxxxxxxxxxxxxxxxxxxx> wrote in message
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"JohnO" <johno@!NOOSPAM!heathkit.com> wrote in message
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"Rahul" <nospam@xxxxxxxxxxxxxxx> wrote in message
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I just bought a new LiIon Laptop battery for my Dell Inspirion E1505
(dual
boot WinXP and Fedora).

I gave it my initial 10 hour charge. Now what? I started using it but
should I continue using it till the battery is drained and then
recharge?
Or should I only drain it partially? If it is not drained fully how
will
the Laptop learn (callibrate) itself to what the new capacity is?

Or is it recommended that I only partially discharge it? What's best
for
the battery life?

Another point: How many times should I cycle it this way? In the long
term
should I always wait for a full discharge; or can I charge it up from a
partially-discharged state or does it not matter?

I've gogled this but recieve conflicting advice.

--
Rahul

What was good for Nicad and NiMH is not good for Li-Ion. That first
discharge/charge cycle trains the charging circuits, it doesn't do
anything good for the battery.

Beyond that, keep it charged,

Why? I often hear this but when this advise is trotted out, the adviser
doesn't actually know the answer. It's rubbish of course.

don't run it to zero if you dont have to.

Why? Same as last answer. There is no evidence that fully discharging a
battery does it any harm. Overdischarging is dangerous, but the monitor
circuits won't let you get even close to this condition.

Recharging them from zero often (usually) results in heating up. Maybe
with proper airflow and an open design a full discharge/recharge regimen
isn't any issue, but in a real-world portable device it definitely
matters. Smaller recharges equal less heat. Your advice about removing the
pack when on AC kinda plays into that. Plus a lot of charging systems are
stupid.


Lithium-ion batteries have an efficiency of nearly 99% and as such generate
(as near as makes no difference) no heat of their own while charging. This
is true as long as the charging is carried out correctly. Removal of the
battery while running on AC has nothing to do with internal heat from the
battery (as many suggest), but heating of the battery by other parts of the
laptop (such as CPU, GPU, hard drive and so on). Li-ion battery charging
systems are never stupid. They have to be designed to fairly rigid and
close tolerance specifications. Lithium-ion batteries can be extremely
dangerous if they are not charged and discharged properly, but if the
charger and protection circuits are properly designed, this won't be a
problem.


.

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