How to use LTspice

[ThomasWheeler]

I'd suggest replacing those.

I replaced all four rectifying diodes with 1N4007 diodes, but the charger is still not working. The LED indicator got brighter though. What should I do next?

 

[bushtech]

I looked inside the battery housing and the temperature contact is not connected to anything

Your sonically welded connections look a bit suspect which started me wondering about whether a repair was bodged.

Do you have these 2 black cables running up the side of the top battery?

 

[ThomasWheeler]

Do you have these 2 black cables running up the side of the top battery?

I don't, but from your photo I'm not sure where the two black cables are connected to. Could you show me please?
This might be the problem!!

 

[bushtech]

If you look closely at the photos you will see that one black wire comes through the plastic and gets connected to the big pin on the left of the photo. The other black wire stops short and connects to the wide pin closest to you. I unfortunately don't have a photo of where those 2 wires go when they disappear into the battery pack but I suspect they go to a thermistor.

 

[ThomasWheeler]

I suspect they go to a thermistor

Do you know what type of thermistor it is? Which thermistor should I get for my battery? The voltage coming out of the charger temperature pin is 5V.

 

[bushtech]

Unfortunately not. Some of the knowledgeable guys on the forum will be able to help

 

[bushtech]

Hope this helps: photo of the thermistor gubbins

 

[ThomasWheeler]

Can you tell me the writings on the thermistor please? That will help me a lot.

 

[bushtech]

No writing on it. Just a piece of heatshrinked plastic

 

[ThomasWheeler]

I think you can remove the heatshrinked plastic and look inside. Can you do that please?

 

[bushtech]

Not cutting open working thermistor. If it helps the thermistor measures 6.6kΩ

 

[ThomasWheeler]

Thanks! I'll try getting one of those.

 

[ThomasWheeler]

good news! I put a thermistor in my battery and it works, Hooray. Thank you for all you guys helping me figure out the problem. Have a nice day.

 

[bushtech]

Glad you got it working

 

[GeekGuy]

Just for future reference, there are only 2 basic types of thermistors NTC (negative temp coefficient; temp up, resistance down) and PTC (positive temp coefficient; temp up, resistance up) as far as I know.