Nokia Battery pinout

  • Thread starter Heywood Jablome
  • Start date
and I'm fairly sure
that with the correct circuit you can charge them properly using only the
+
and - terminals, so you don't really need to know what the other
connections
are for.
Click to expand...

I have looked into charging lithiums. The general practice is to hold a
constant current till the battery reaches 4.2V, then taper off the current
and hold the voltage at 4.2V till the charge current is under 10% of what it
initially started at. Then switch off. (no trickle charge)

It would still be nice tho to find a web page of someone who has already
done something like this. I'm sure they have and I'm sure there is a web
site that describes it but its a shame that these phones and batteries are
so popular that every site I find using google is one that wants to sell me
nokia accessories!!!

For the record I'd prefer not to open the battery so I would still like to
know for sure what is connected to the other terminals and other specs.
including charge current etc.
 
On Thu, 08 Dec 2005 09:41:37 +0800, budgie <me@privacy.net> wrote:

On Wed, 07 Dec 2005 11:55:56 GMT, "Poxy" <pox@poxymail.com> wrote:

Stan Blazejewski wrote:

The 2 center terminals 'should' be a temp sensor for use with a delta
time/delta temp charging system. Easy way to tell is if it changes
when it's warmed up in the hands or cooled in the fridge.

I know temperature change is often used for detecting end of charge for
NiCads, but is it also used for LiIon?

NO!
Click to expand...
It may not be used for charging but I have 3 Nokia batteries here (BMC-3 & 2 x
BLD-3) and the readings on the center contacts change predictably according to
temperature. It could be a safety issue as my owners manual mentions the phone
may no work if it is hot (eg, left in a car).

In any case the center contacts are definately connected to a temperature
sensing device.


--

Australia isn't "down under", it's "off to one side"!

stanblaz@netspace.net.au
www.cobracat.com (home of the Australian Cobra Catamaran)
http://groups.yahoo.com/group/cobra-cat/
 
On Thu, 08 Dec 2005 21:36:03 +1100, Stan Blazejewski <stanblaz@netspace.net.au>
wrote:

On Thu, 08 Dec 2005 09:41:37 +0800, budgie <me@privacy.net> wrote:

On Wed, 07 Dec 2005 11:55:56 GMT, "Poxy" <pox@poxymail.com> wrote:

Stan Blazejewski wrote:

The 2 center terminals 'should' be a temp sensor for use with a delta
time/delta temp charging system. Easy way to tell is if it changes
when it's warmed up in the hands or cooled in the fridge.

I know temperature change is often used for detecting end of charge for
NiCads, but is it also used for LiIon?

NO!

It may not be used for charging but I have 3 Nokia batteries here (BMC-3 & 2 x
BLD-3) and the readings on the center contacts change predictably according to
temperature. It could be a safety issue as my owners manual mentions the phone
may no work if it is hot (eg, left in a car).

In any case the center contacts are definately connected to a temperature
sensing device.
Click to expand...
Temperature is used in Li-Ion charging as a "qualifying" parameter only, not as
an end-of-charge indicator. The charge regime used almost exclusively is
current-limited constant voltage. After transition from CL to CV, charge is
usually terminated when the current has tapered off to a pre-ordained level like
10% of the CL value.

Unlike NiXX chemistries, Li-on and Li-Poly cells do not exhibit any sudden
change in terminal characteristics as they approach "full charge", and they
certainly DON'T generate any significant heat or exhibit any significant temp
rise when charged correctly.
 
Most nokia's equipped with "Net Monitor" hidden menus are able to display a
"temp" screen, which I believe is the reading from the batery module..



"Stan Blazejewski" <stanblaz@netspace.net.au> wrote in message
news:i7mfp1tprau0svdbv396525cbsol1mjqes@4ax.com...
On Thu, 08 Dec 2005 09:41:37 +0800, budgie <me@privacy.net> wrote:

On Wed, 07 Dec 2005 11:55:56 GMT, "Poxy" <pox@poxymail.com> wrote:

Stan Blazejewski wrote:

The 2 center terminals 'should' be a temp sensor for use with a delta
time/delta temp charging system. Easy way to tell is if it changes
when it's warmed up in the hands or cooled in the fridge.

I know temperature change is often used for detecting end of charge for
NiCads, but is it also used for LiIon?

NO!

It may not be used for charging but I have 3 Nokia batteries here (BMC-3 &
2 x
BLD-3) and the readings on the center contacts change predictably
according to
temperature. It could be a safety issue as my owners manual mentions the
phone
may no work if it is hot (eg, left in a car).

In any case the center contacts are definately connected to a temperature
sensing device.


--

Australia isn't "down under", it's "off to one side"!

stanblaz@netspace.net.au
www.cobracat.com (home of the Australian Cobra Catamaran)
http://groups.yahoo.com/group/cobra-cat/
Click to expand...
 
i found that on the blb2 batt is the two midde tabs tell the phone, the
batt power levels and when to turn the phone off when the batt gets too
low.to save the batt from harm.if your phone shows one bar left then
bridge the two middle contact with tinfoil while in your phone then it
will show "full power" and work for some time (good tip if your stuck
somewhere with a flat batt).there is an unbeilveable amound of
electronics for this inside the battery.there is a temp device inside
but nothing to do with the 4 contacts it simply disconnects the minus
connection from the terminal,(which looks like it should be the plus).
 
"the crusher" <simon-clare@supanet.com> wrote in message
news:1135808245.478339.198180@z14g2000cwz.googlegroups.com...
i found that on the blb2 batt is the two midde tabs tell the phone, the
batt power levels and when to turn the phone off when the batt gets too
low.to save the batt from harm.if your phone shows one bar left then
bridge the two middle contact with tinfoil while in your phone then it
will show "full power" and work for some time (good tip if your stuck
somewhere with a flat batt).there is an unbeilveable amound of
electronics for this inside the battery.there is a temp device inside
but nothing to do with the 4 contacts it simply disconnects the minus
connection from the terminal,(which looks like it should be the plus).
Click to expand...
Thanks for that info. While these phones and batteries are very popular,
there seems to be little in the way of technical info available for the
battery.
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top