Help identify the discrete component in this battery pack











up vote
8
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


battery pack



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







share|improve this question
























  • remotely related: Why are there 3 pins on some batteries?
    – Nick Alexeev♦
    5 hours ago















up vote
8
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


battery pack



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







share|improve this question
























  • remotely related: Why are there 3 pins on some batteries?
    – Nick Alexeev♦
    5 hours ago













up vote
8
down vote

favorite









up vote
8
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


battery pack



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







share|improve this question















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


battery pack



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






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 20 hours ago

























asked 20 hours ago









ARF

2,71333152




2,71333152












  • remotely related: Why are there 3 pins on some batteries?
    – Nick Alexeev♦
    5 hours ago


















  • remotely related: Why are there 3 pins on some batteries?
    – Nick Alexeev♦
    5 hours ago
















remotely related: Why are there 3 pins on some batteries?
– Nick Alexeev♦
5 hours ago




remotely related: Why are there 3 pins on some batteries?
– Nick Alexeev♦
5 hours ago










2 Answers
2






active

oldest

votes

















up vote
20
down vote













Its a thermistor like this (photo from internet, not spam related):



Photo from internet



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:



Photo from internet



Related: Voltage input for charging NiMH Batteries



If you can measure the temperature, you can check when it's charged up.






share|improve this answer



















  • 1




    +1 your answer is much better than mine.
    – dim
    20 hours ago


















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.






share|improve this answer





















  • Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
    – ARF
    20 hours ago











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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
20
down vote













Its a thermistor like this (photo from internet, not spam related):



Photo from internet



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:



Photo from internet



Related: Voltage input for charging NiMH Batteries



If you can measure the temperature, you can check when it's charged up.






share|improve this answer



















  • 1




    +1 your answer is much better than mine.
    – dim
    20 hours ago















up vote
20
down vote













Its a thermistor like this (photo from internet, not spam related):



Photo from internet



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:



Photo from internet



Related: Voltage input for charging NiMH Batteries



If you can measure the temperature, you can check when it's charged up.






share|improve this answer



















  • 1




    +1 your answer is much better than mine.
    – dim
    20 hours ago













up vote
20
down vote










up vote
20
down vote









Its a thermistor like this (photo from internet, not spam related):



Photo from internet



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:



Photo from internet



Related: Voltage input for charging NiMH Batteries



If you can measure the temperature, you can check when it's charged up.






share|improve this answer














Its a thermistor like this (photo from internet, not spam related):



Photo from internet



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:



Photo from internet



Related: Voltage input for charging NiMH Batteries



If you can measure the temperature, you can check when it's charged up.







share|improve this answer














share|improve this answer



share|improve this answer








edited 16 hours ago

























answered 20 hours ago









José Manuel Ramos

40019




40019








  • 1




    +1 your answer is much better than mine.
    – dim
    20 hours ago














  • 1




    +1 your answer is much better than mine.
    – dim
    20 hours ago








1




1




+1 your answer is much better than mine.
– dim
20 hours ago




+1 your answer is much better than mine.
– dim
20 hours ago












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.






share|improve this answer





















  • Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
    – ARF
    20 hours ago















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.






share|improve this answer





















  • Of course, that makes perfect sense. I should have thought of that. Easy to verify and not very likely to break. - Many thanks!
    – ARF
    20 hours ago













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.






share|improve this answer












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.







share|improve this answer












share|improve this answer



share|improve this answer










answered 20 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
    20 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
    20 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
20 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
20 hours ago


















 

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