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need the help to understand the circuit of the battery of the PDA(acer N300)
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M.Joshi
electronics forum addict


Joined: 02 May 2005
Posts: 51

PostPosted: Thu Jul 06, 2006 2:08 am    Post subject: Re: need the help to understand the circuit of the battery of the PDA(acer N300) Reply with quote

I was initially confused looking at the two sets of test results but
after studying it for a while, I have created what I think is an easier
table for viewing them (See attached file).


alex Wrote:
Quote:
I have bought a PDA (acer n300), and I can find nothing details about
its battery.
It is written on the back of the battery pack that:
Model NO: BA-1405106
Product Name: Acer n300 battery pack, rechargeable
lithium-ion
battery
Rating: DC 3.7v 1200mAh

At the bottom of the battery, there are 6 pins (3 pins each side).

| | | | | |
a b c d e f

After charging the battery, I measured the tensions between all of
these pins. And I got the following results: condition 1: unused
situation
Condition 2: under use situation
(while
the PDA works)
1) +
a
b 0
c 0 0
d 1.2/3.7 4 4
e 1.2/3.7 4 4 0
f 0 0 0 -4 -4
- a b c d e
f

2 ) +
a
b -3.2
c -3.2 0
d 0.6 4 4
e 0.6 4 4 0
f -3.2 0 0 -4 -4
- a b c d e
f


In condition 1, the tensions between the Pin A and D, the Pin A and E
vary in the two fixed values 1.2 and 3.7

And in condition 2, all of the tensions who are measured with Pin A
have descended by -3.2 v.
Is there anyone who can explain why this battery behaves like this? Or
maybe someone has some technical sheet about this battery pack. Tell
me about it please !
Thank you in advance.


+-------------------------------------------------------------------+
|Filename: Battery Pack Voltage Measurements.txt |
|Download: http://www.diybanter.com/attachment.php?attachmentid=186 |
+-------------------------------------------------------------------+



--
M.Joshi
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alex
electronics forum beginner


Joined: 05 Jul 2006
Posts: 1

PostPosted: Wed Jul 05, 2006 1:14 pm    Post subject: need the help to understand the circuit of the battery of the PDA(acer N300) Reply with quote

I have bought a PDA (acer n300), and I can find nothing details about
its battery.
It is written on the back of the battery pack that:
Model NO: BA-1405106
Product Name: Acer n300 battery pack, rechargeable lithium-ion
battery
Rating: DC 3.7v 1200mAh

At the bottom of the battery, there are 6 pins (3 pins each side).

| | | | | |
a b c d e f

After charging the battery, I measured the tensions between all of
these pins. And I got the following results: condition 1: unused
situation
Condition 2: under use situation (while
the PDA works)
1) +
a
b 0
c 0 0
d 1.2/3.7 4 4
e 1.2/3.7 4 4 0
f 0 0 0 -4 -4
- a b c d e
f

2 ) +
a
b -3.2
c -3.2 0
d 0.6 4 4
e 0.6 4 4 0
f -3.2 0 0 -4 -4
- a b c d e
f


In condition 1, the tensions between the Pin A and D, the Pin A and E
vary in the two fixed values 1.2 and 3.7

And in condition 2, all of the tensions who are measured with Pin A
have descended by -3.2 v.
Is there anyone who can explain why this battery behaves like this? Or
maybe someone has some technical sheet about this battery pack. Tell
me about it please !
Thank you in advance.
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