which thermistor for battery pack ?

[petehall347]

ok got a 80v lithium pack in with dodgy temp sensing thermistor .its stuck at 13.5k .
have removed it and tacked a 10k resistor across where it goes and now the charger thinks its good to charge proving it is the thermistor ..
question is would a MF52D 3950 1% High Precision NTC Leaded Thermistor work ok for this application ?

[sam_sam_sam]

Re: which thermistor for battery pack ?

This might be a better choice

P/N 1600-10K Thermistor

I could not find the temperature chart for this particular part number

MF52D 3950

You might want to find out what the temperature range that this charging unit has

Use a pot and find out what the range is

[petehall347]

Re: which thermistor for battery pack ?

good idea if i can find a pot . i can get hold of another battery pack and check extremes of the one fitted by blowing hot air and freezing it .

[petehall347]

Re: which thermistor for battery pack ?

i think 3950 is the beta ....MF52D is the part number

[petehall347]

Re: which thermistor for battery pack ?

rooting around the net it looks like beta 3950 are used in some packs so will order a couple of them and see how it behaves .

[petehall347]

Re: which thermistor for battery pack ?

ok i fitted the new thermistor but it was still playing up . i had spliced the new wires to the old and didnt notice the wires had been trapped since it was built in the factory . fixed that problem and now all is well .

[sam_sam_sam]

Re: which thermistor for battery pack ?

Nice find for what the problem was