Help identify the discrete component in this battery pack
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5
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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 10 hours ago
ARF
2,69833152
add a comment |
up vote
5
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 10 hours ago
ARF
2,69833152
add a comment |
up vote
5
down vote
favorite
up vote
5
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 10 hours ago
ARF
2,69833152
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 10 hours ago
ARF
2,69833152
asked 10 hours ago
ARF
2,69833152
edited 9 hours ago
asked 10 hours ago
ARF
2,69833152
asked 10 hours ago
ARF
2,69833152
asked 10 hours ago
ARF
2,69833152
2,69833152
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
up vote
18
down vote
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 9 hours ago
José Manuel Ramos
38018
1
+1 your answer is much better than mine.
– dim
9 hours ago
add a comment |
up vote
6
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 9 hours ago
dim
12.9k22366
Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
– ARF
9 hours ago
add a comment |
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
18
down vote
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 9 hours ago
José Manuel Ramos
38018
1
+1 your answer is much better than mine.
– dim
9 hours ago
add a comment |
up vote
18
down vote
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 9 hours ago
José Manuel Ramos
38018
1
+1 your answer is much better than mine.
– dim
9 hours ago
add a comment |
up vote
18
down vote
up vote
18
down vote
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 9 hours ago
José Manuel Ramos
38018
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 9 hours ago
José Manuel Ramos
38018
edited 6 hours ago
answered 9 hours ago
José Manuel Ramos
38018
answered 9 hours ago
José Manuel Ramos
38018
answered 9 hours ago
José Manuel Ramos
38018
38018
1
+1 your answer is much better than mine.
– dim
9 hours ago
add a comment |
1
+1 your answer is much better than mine.
– dim
9 hours ago
1
1
+1 your answer is much better than mine.
– dim
9 hours ago
+1 your answer is much better than mine.
– dim
9 hours ago
add a comment |
up vote
6
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 9 hours ago
dim
12.9k22366
Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
– ARF
9 hours ago
add a comment |
up vote
6
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 9 hours ago
dim
12.9k22366
Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
– ARF
9 hours ago
add a comment |
up vote
6
down vote
up vote
6
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 9 hours ago
dim
12.9k22366
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 9 hours ago
dim
12.9k22366
answered 9 hours ago
dim
12.9k22366
answered 9 hours ago
dim
12.9k22366
answered 9 hours ago
dim
12.9k22366
12.9k22366
Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
– ARF
9 hours ago
add a comment |
Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
– ARF
9 hours ago
Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
– ARF
9 hours ago
Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
– ARF
9 hours ago
add a comment |
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