Help identify the discrete component in this battery pack
up vote
18
down vote
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I am rebuilding a NiMH battery pack for a RF remote control device which can be recharged by plugging the device in.
The battery pack is connected with three wires:
- black to the negative
- red to the positive
- BLUE through a mysterious discrete component to the negative
The component in line with the blue wire looks a bit like a glass-body diode but my multimeter cannot measure a diode voltage. (It measures infinity, not zero, if this helps.)
However, I can measure about 11.5 kOhm across the component in both directions.
Can anybody enlighten me, what this component is likely to be? I would like to verify that the component is still functional because it is unclear whether or not the device still charges properly.
batteries identification
asked Nov 19 at 10:01
ARF
2,77033154
add a comment |
up vote
18
down vote
favorite
I am rebuilding a NiMH battery pack for a RF remote control device which can be recharged by plugging the device in.
The battery pack is connected with three wires:
- black to the negative
- red to the positive
- BLUE through a mysterious discrete component to the negative
The component in line with the blue wire looks a bit like a glass-body diode but my multimeter cannot measure a diode voltage. (It measures infinity, not zero, if this helps.)
However, I can measure about 11.5 kOhm across the component in both directions.
Can anybody enlighten me, what this component is likely to be? I would like to verify that the component is still functional because it is unclear whether or not the device still charges properly.
batteries identification
asked Nov 19 at 10:01
ARF
2,77033154
1
remotely related: Why are there 3 pins on some batteries?
– Nick Alexeev♦
Nov 20 at 1:00
add a comment |
up vote
18
down vote
favorite
up vote
18
down vote
favorite
I am rebuilding a NiMH battery pack for a RF remote control device which can be recharged by plugging the device in.
The battery pack is connected with three wires:
- black to the negative
- red to the positive
- BLUE through a mysterious discrete component to the negative
The component in line with the blue wire looks a bit like a glass-body diode but my multimeter cannot measure a diode voltage. (It measures infinity, not zero, if this helps.)
However, I can measure about 11.5 kOhm across the component in both directions.
Can anybody enlighten me, what this component is likely to be? I would like to verify that the component is still functional because it is unclear whether or not the device still charges properly.
batteries identification
asked Nov 19 at 10:01
ARF
2,77033154
I am rebuilding a NiMH battery pack for a RF remote control device which can be recharged by plugging the device in.
The battery pack is connected with three wires:
- black to the negative
- red to the positive
- BLUE through a mysterious discrete component to the negative
The component in line with the blue wire looks a bit like a glass-body diode but my multimeter cannot measure a diode voltage. (It measures infinity, not zero, if this helps.)
However, I can measure about 11.5 kOhm across the component in both directions.
Can anybody enlighten me, what this component is likely to be? I would like to verify that the component is still functional because it is unclear whether or not the device still charges properly.
batteries identification
batteries identification
asked Nov 19 at 10:01
ARF
2,77033154
asked Nov 19 at 10:01
ARF
2,77033154
edited Nov 19 at 10:22
asked Nov 19 at 10:01
ARF
2,77033154
asked Nov 19 at 10:01
ARF
2,77033154
asked Nov 19 at 10:01
ARF
2,77033154
2,77033154
1
remotely related: Why are there 3 pins on some batteries?
– Nick Alexeev♦
Nov 20 at 1:00
add a comment |
1
remotely related: Why are there 3 pins on some batteries?
– Nick Alexeev♦
Nov 20 at 1:00
1
1
remotely related: Why are there 3 pins on some batteries?
– Nick Alexeev♦
Nov 20 at 1:00
remotely related: Why are there 3 pins on some batteries?
– Nick Alexeev♦
Nov 20 at 1:00
add a comment |
2 Answers
2
active
oldest
votes
up vote
35
down vote
accepted
Its a thermistor like this (photo from internet, not spam related):
This kind of resistor depends on the temperature of both batteries.
EDIT: In this photo, is a Negative Temperature Coefficient. There are also Positive Temperature Coefficient resistors. The main difference between them is how the resistor decreases or increases when the temperature grows, respectively.
That's a cheap component and a cheaper way to determine when both batteries are charged up.
When a NiMH is almost charged, its temperature starts to grow. If you measure the temperature based on a voltage divider into a DAC, you can measure the temperature and, therefore, activate the charge or deactivate it.
EDIT: The thermistor must be very close to the batteries to read a correct value, so that's why this discrete component is located close to the batteries.
The temperature based graph to read when stop charging the battery is like this:
Related: Voltage input for charging NiMH Batteries
If you can measure the temperature, you can check when it's charged up.
answered Nov 19 at 10:09
José Manuel Ramos
56129
3
+1 your answer is much better than mine.
– dim
Nov 19 at 10:12
add a comment |
up vote
10
down vote
It is a thermistor. This senses the battery temperature, so the charger can know when something goes wrong.
Measuring it likely won't tell you if the battery pack is still working correctly, though.
answered Nov 19 at 10:08
dim
13k22367
1
Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
– ARF
Nov 19 at 10:11
add a comment |
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
35
down vote
accepted
Its a thermistor like this (photo from internet, not spam related):
This kind of resistor depends on the temperature of both batteries.
EDIT: In this photo, is a Negative Temperature Coefficient. There are also Positive Temperature Coefficient resistors. The main difference between them is how the resistor decreases or increases when the temperature grows, respectively.
That's a cheap component and a cheaper way to determine when both batteries are charged up.
When a NiMH is almost charged, its temperature starts to grow. If you measure the temperature based on a voltage divider into a DAC, you can measure the temperature and, therefore, activate the charge or deactivate it.
EDIT: The thermistor must be very close to the batteries to read a correct value, so that's why this discrete component is located close to the batteries.
The temperature based graph to read when stop charging the battery is like this:
Related: Voltage input for charging NiMH Batteries
If you can measure the temperature, you can check when it's charged up.
answered Nov 19 at 10:09
José Manuel Ramos
56129
3
+1 your answer is much better than mine.
– dim
Nov 19 at 10:12
add a comment |
up vote
35
down vote
accepted
Its a thermistor like this (photo from internet, not spam related):
This kind of resistor depends on the temperature of both batteries.
EDIT: In this photo, is a Negative Temperature Coefficient. There are also Positive Temperature Coefficient resistors. The main difference between them is how the resistor decreases or increases when the temperature grows, respectively.
That's a cheap component and a cheaper way to determine when both batteries are charged up.
When a NiMH is almost charged, its temperature starts to grow. If you measure the temperature based on a voltage divider into a DAC, you can measure the temperature and, therefore, activate the charge or deactivate it.
EDIT: The thermistor must be very close to the batteries to read a correct value, so that's why this discrete component is located close to the batteries.
The temperature based graph to read when stop charging the battery is like this:
Related: Voltage input for charging NiMH Batteries
If you can measure the temperature, you can check when it's charged up.
answered Nov 19 at 10:09
José Manuel Ramos
56129
3
+1 your answer is much better than mine.
– dim
Nov 19 at 10:12
add a comment |
up vote
35
down vote
accepted
up vote
35
down vote
accepted
Its a thermistor like this (photo from internet, not spam related):
This kind of resistor depends on the temperature of both batteries.
EDIT: In this photo, is a Negative Temperature Coefficient. There are also Positive Temperature Coefficient resistors. The main difference between them is how the resistor decreases or increases when the temperature grows, respectively.
That's a cheap component and a cheaper way to determine when both batteries are charged up.
When a NiMH is almost charged, its temperature starts to grow. If you measure the temperature based on a voltage divider into a DAC, you can measure the temperature and, therefore, activate the charge or deactivate it.
EDIT: The thermistor must be very close to the batteries to read a correct value, so that's why this discrete component is located close to the batteries.
The temperature based graph to read when stop charging the battery is like this:
Related: Voltage input for charging NiMH Batteries
If you can measure the temperature, you can check when it's charged up.
answered Nov 19 at 10:09
José Manuel Ramos
56129
Its a thermistor like this (photo from internet, not spam related):
This kind of resistor depends on the temperature of both batteries.
EDIT: In this photo, is a Negative Temperature Coefficient. There are also Positive Temperature Coefficient resistors. The main difference between them is how the resistor decreases or increases when the temperature grows, respectively.
That's a cheap component and a cheaper way to determine when both batteries are charged up.
When a NiMH is almost charged, its temperature starts to grow. If you measure the temperature based on a voltage divider into a DAC, you can measure the temperature and, therefore, activate the charge or deactivate it.
EDIT: The thermistor must be very close to the batteries to read a correct value, so that's why this discrete component is located close to the batteries.
The temperature based graph to read when stop charging the battery is like this:
Related: Voltage input for charging NiMH Batteries
If you can measure the temperature, you can check when it's charged up.
answered Nov 19 at 10:09
José Manuel Ramos
56129
edited Nov 19 at 13:45
answered Nov 19 at 10:09
José Manuel Ramos
56129
answered Nov 19 at 10:09
José Manuel Ramos
56129
answered Nov 19 at 10:09
José Manuel Ramos
56129
56129
3
+1 your answer is much better than mine.
– dim
Nov 19 at 10:12
add a comment |
3
+1 your answer is much better than mine.
– dim
Nov 19 at 10:12
3
3
+1 your answer is much better than mine.
– dim
Nov 19 at 10:12
+1 your answer is much better than mine.
– dim
Nov 19 at 10:12
add a comment |
up vote
10
down vote
It is a thermistor. This senses the battery temperature, so the charger can know when something goes wrong.
Measuring it likely won't tell you if the battery pack is still working correctly, though.
answered Nov 19 at 10:08
dim
13k22367
1
Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
– ARF
Nov 19 at 10:11
add a comment |
up vote
10
down vote
It is a thermistor. This senses the battery temperature, so the charger can know when something goes wrong.
Measuring it likely won't tell you if the battery pack is still working correctly, though.
answered Nov 19 at 10:08
dim
13k22367
1
Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
– ARF
Nov 19 at 10:11
add a comment |
up vote
10
down vote
up vote
10
down vote
It is a thermistor. This senses the battery temperature, so the charger can know when something goes wrong.
Measuring it likely won't tell you if the battery pack is still working correctly, though.
answered Nov 19 at 10:08
dim
13k22367
It is a thermistor. This senses the battery temperature, so the charger can know when something goes wrong.
Measuring it likely won't tell you if the battery pack is still working correctly, though.
answered Nov 19 at 10:08
dim
13k22367
answered Nov 19 at 10:08
dim
13k22367
answered Nov 19 at 10:08
dim
13k22367
answered Nov 19 at 10:08
dim
13k22367
13k22367
1
Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
– ARF
Nov 19 at 10:11
add a comment |
1
Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
– ARF
Nov 19 at 10:11
1
1
Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
– ARF
Nov 19 at 10:11
Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
– ARF
Nov 19 at 10:11
add a comment |
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remotely related: Why are there 3 pins on some batteries?
– Nick Alexeev♦
Nov 20 at 1:00