Dismantling: Briggs & Stratton 10.8v Instart Battery | IS12B-593560

[Chant]

Rach and anyone else that can shed some light on this.  The instart battery that you dismantled has two small wires extending from the circuit board and attached with sealant to the cells.  My questions:  Is it on piece of two strand wire in a loop from the circuit board or two pieces of two strad wire and both are attached to the board?  Also, is the a temp sensor attached to the end or middle of the wires?  Can you tell me what that sensor is?  My son picked up a battery like this at a yard sale knowing I need one but unfortunately it was dismantled.  He knew I could rebuild the cells but the wires I'm speaking of were cut/torn off so I don't know if there's anything I can do without knowing what those wires do.  I'm sure they are a temp sensor but I can't see an actual sensor in your pictures.
Thanks to all for any help.
Take care,
Chant

[Mick]

Hi Chant, and welcome to TGMF.

It's definitely a temperature sensor but what type I haven't a clue.  I believe it stops the charging process should the batteries become over heated during charging.

If I get a chance I'll see if I can find any info on the sensor.     

[Chant]

Thanks a lot for your help!  I believe it's a thermistor but don't know much about them.
 I think there's a way to measure their reistance but again, I don't know how. If you have and boards or even just the sensor with wires attached I'm really interested. But knowing what the sensor is will work too!
Take care,
Chant

[computerix]

I recently received a Briggs and Stratton instart battery from my mother-in-law. The green and red LEDs on the charger were blinking alternately. The individual cells of the battery were charged differently and unfortunately the charger cannot compensate for this. I charged the cells individually to the same voltage and this solved the problem. I wrote an iFixit article about this. Maybe it will help someone with the same issue.
https://www.ifixit.com/Guide/Briggs+and+Stratton+instart+-+Battery+imbalance+repair/172196

[Mick]

computerix, welcome to TGMF.

Thank you for posting that info, I'm sure it will come in handy.  The batteries I had problems with were suffering with the flashing lights when charging, but not sure if the same as you described.  I posted a couple of them on Youtube you can see  them here,

https://youtube.com/shorts/Is13NuvhSJk?si=G3i8wcr-A1I_WVW-
https://youtube.com/shorts/IfMtuh2vIk8?si=iPXavnl-nfoAmNn2

[computerix]

Thank you for posting that info, I'm sure it will come in handy.  The batteries I had problems with were suffering with the flashing lights when charging, but not sure if the same as you described.

Thanks for the reply. I was aware that this is not the same problem. In your case I also think that one cell is completly dead and therefore only a replacement will help. I wanted to help those who think they need to replace the cells in any case.

[Mick]

Thanks, like I said I'm sure it will be handy info for those having the same issue as you mentioned.

I think I might have enough donor batteries to try and make a good one out of, but need to get or make up a spot welder to strap them together again.  Don't think my soldering iron will do it as the tip is too small.