How should i charge my li-ion battery of my cellphone?

On Sat, 6 Dec 2003 13:10:43 +0000 (UTC), [email protected] (Mike S.)
posted in alt.cellular.motorola:

>According to a battery engineer who posts a lot on the battery newsgroup,
>this is a fallacy:

If the battery is on the shelf long enough, it has to be reformed. If
you want to make the assumption that your battery hasn't been sitting
around for many months, that's your decision.
--
Al - rukbat at optonline dot net

---

› See More: How should i charge my li-ion battery of my cellphone?

"Mel Harris" <[email protected]> wrote in message
news:[email protected]...
> The first time it should be charged for at least 12 hours before using.
The
> next 2 or 3 times you should run the battery down as low as you can and
then

NEVER EVER discharge a lithium ion battery in this fashion.

"Michael" <[email protected]> wrote in message
news:[email protected]...
>
> "Mel Harris" <[email protected]> wrote in message
> news:[email protected]...
> > The first time it should be charged for at least 12 hours before using.
> The
> > next 2 or 3 times you should run the battery down as low as you can and
> then
>
> NEVER EVER discharge a lithium ion battery in this fashion.

Hmm, been doing it with 6 different Li-Ion batteries over the last 4 years
and they're all still going strong...

Ivor

"Ivor Jones" <[email protected]> wrote in message
news:[email protected]...
>
> "Michael" <[email protected]> wrote in message
> news:[email protected]...
> >
> > "Mel Harris" <[email protected]> wrote in message
> > news:[email protected]...
> > > The first time it should be charged for at least 12 hours before
using.
> > The
> > > next 2 or 3 times you should run the battery down as low as you can
and
> > then
> >
> > NEVER EVER discharge a lithium ion battery in this fashion.
>
> Hmm, been doing it with 6 different Li-Ion batteries over the last 4 years
> and they're all still going strong...
>
> Ivor
>
The instructions that came with my 6200 say to let it discharge completely
the first 2-3 times.

--Mike

On Sun, 7 Dec 2003 10:44:22 -0700, "Mike Cook" <[email protected]>
posted in alt.cellular.motorola:

>The instructions that came with my 6200 say to let it discharge completely
>the first 2-3 times.

That'll condition it if it's been a while since it left the factory.
If the phone and battery are working properly it can't hurt, since the
phone will shut off before it discharges the battery too far.
--
Al - rukbat at optonline dot net

In article <[email protected]>,
Al Klein <[email protected]> wrote:
>On Sun, 7 Dec 2003 10:44:22 -0700, "Mike Cook" <[email protected]>
>posted in alt.cellular.motorola:
>
>>The instructions that came with my 6200 say to let it discharge completely
>>the first 2-3 times.
>
>That'll condition it if it's been a while since it left the factory.
>If the phone and battery are working properly it can't hurt, since the
>phone will shut off before it discharges the battery too far.

The key point is that you let it run down *in the phone* until the
phone turns off. NOT some third-party "conditioning" charger, which
would just try to drain the battery. The charging logic in the phone
knows how far the battery should be discharged, and then stops.

Let the battery die down completely before the first time you charge it.
Than after that, you can charge it whenever you want or need to. These
type of batteries have no "memory" so it doesn't matter when you charge
it. Also, it is much better for your battery if you ONLY use the HOME
charger and not the car charger!

Al Klein <[email protected]> staggered to the nearest keyboard and
wrote:

>If you discharge it 25% each time, you'll get 4 times the number of
>charge/discharge cycles.

Not according to Motorola. Their whole point is that the relationship
is exponential with depth of discharge (DOD) rather than linear, so
instead of getting 4 times the number of cycles with 25% DOD, you get
5 or 6 times the number of cycles.

So, if the battery will last for (say) 500 cycles if fully discharged,
it will last for 2500-3000 cycles at 25% DOD. Thus, at 25% DOD you
get somewhere between 625 (=0.25*2500) and 750 (=0.25*3000)
"effective" cycles from the battery. That's not a huge improvement,
only 25% to 50%, but it certainly refutes the oft-heard "fully
discharge the battery" advice.


--
hambu n hambu hodo

On 8 Dec 2003 19:07:04 GMT, [email protected]lid (CharlesH) posted
in alt.cellular.motorola:

>In article <[email protected]>,
>Al Klein <[email protected]> wrote:
>>On Sun, 7 Dec 2003 10:44:22 -0700, "Mike Cook" <[email protected]>
>>posted in alt.cellular.motorola:
>>
>>>The instructions that came with my 6200 say to let it discharge completely
>>>the first 2-3 times.
>>
>>That'll condition it if it's been a while since it left the factory.
>>If the phone and battery are working properly it can't hurt, since the
>>phone will shut off before it discharges the battery too far.
>
>The key point is that you let it run down *in the phone* until the
>phone turns off. NOT some third-party "conditioning" charger, which
>would just try to drain the battery. The charging logic in the phone
>knows how far the battery should be discharged, and then stops.

Unless you're using the *correct* third-party "conditioning charger",
in which case you can even bring back a battery that was discharged
past the shutoff point.
--
Al - rukbat at optonline dot net

"Charles Hawtrey" <[email protected]> wrote in message
news:[email protected]...
> Al Klein <[email protected]> staggered to the nearest keyboard and
> wrote:
>
> >If you discharge it 25% each time, you'll get 4 times the number of
> >charge/discharge cycles.
>
> Not according to Motorola. Their whole point is that the relationship
> is exponential with depth of discharge (DOD) rather than linear, so
> instead of getting 4 times the number of cycles with 25% DOD, you get
> 5 or 6 times the number of cycles.
>
> So, if the battery will last for (say) 500 cycles if fully discharged,
> it will last for 2500-3000 cycles at 25% DOD. Thus, at 25% DOD you
> get somewhere between 625 (=0.25*2500) and 750 (=0.25*3000)
> "effective" cycles from the battery. That's not a huge improvement,
> only 25% to 50%, but it certainly refutes the oft-heard "fully
> discharge the battery" advice.

It all boils down to the effective number of hours of operation a given
battery will supply. Does a battery last for more hours if (almost) fully
discharged than if continually topped up..? I have still not seen a
definitive answer to this question.

I have 6 Li-Ion batteries some of which are 3 to 4 years old and I have
always run them down to the point where I get the low battery bleep from the
phone before recharging. They are all still giving many hours of useful life
per charge. Not as long as when they were new, granted, but long enough for
me not to need to think about replacing them just yet..!

I also cycle the batteries on my phones; when one needs to be charged
another fully charged one is put in place while the one I have just removed
is charged. When the charge is completed it goes into the fully charged pile
and waits its turn to be used again.

Ivor

On Tue, 9 Dec 2003 10:38:53 -0000, "Ivor Jones"
<[email protected]> posted in alt.cellular.motorola:

>I also cycle the batteries on my phones; when one needs to be charged
>another fully charged one is put in place while the one I have just removed
>is charged. When the charge is completed it goes into the fully charged pile
>and waits its turn to be used again.

I do something similar - I change batteries at the beginning of every
month. I also have 3 and 4 year old batteries giving me almost full
discharge times.
--
Al - rukbat at optonline dot net

"Ivor Jones" <[email protected]> staggered to the nearest
keyboard and wrote:

>
>"Charles Hawtrey" <[email protected]> wrote in message
>news:[email protected]...
>> Al Klein <[email protected]> staggered to the nearest keyboard and
>> wrote:
>>
>> >If you discharge it 25% each time, you'll get 4 times the number of
>> >charge/discharge cycles.
>>
>> Not according to Motorola. Their whole point is that the relationship
>> is exponential with depth of discharge (DOD) rather than linear, so
>> instead of getting 4 times the number of cycles with 25% DOD, you get
>> 5 or 6 times the number of cycles.
>>
>> So, if the battery will last for (say) 500 cycles if fully discharged,
>> it will last for 2500-3000 cycles at 25% DOD. Thus, at 25% DOD you
>> get somewhere between 625 (=0.25*2500) and 750 (=0.25*3000)
>> "effective" cycles from the battery. That's not a huge improvement,
>> only 25% to 50%, but it certainly refutes the oft-heard "fully
>> discharge the battery" advice.
>
>It all boils down to the effective number of hours of operation a given
>battery will supply. Does a battery last for more hours if (almost) fully
>discharged than if continually topped up..? I have still not seen a
>definitive answer to this question.

Motorola's definitive answer, as quoted above, is "no, in fact just
the opposite."


--
hambu n hambu hodo