Dell 48Wh Battery circuit

[AjA]

Hello,
Below Pics are my Dell laptop battery circuit board where i circle in yellow mark, since i don't know what is this part, so i am wondering if anyone know what is work of said thing on circuit,
why i want to know this, here is reason,
i open battery to change its old cells with new and i did changed but after finished soldering new cells i find out i loss these two small wires from circuit board that place some where, i search alot on my table but not found, than i put two wires my own & try to check battery but after that battery not working & Dell Laptop showing battery is bad, so i am sure this thing is responsible & what i put two ordinary wires not working as per circuit it should work, so if anyone help me to tell what is this so i buy one new from computer hardware store & replace it,
Hope will get some help from someone who know what i am asking,
Thanks.

[ealex]

that might have been a thermistor - the controller uses it to sense the pack temperature.
i don't think it will allow charging without it - the controller will see a battery way to hot or way to cold, depending on how it's implemented.

also, it's not clear from the picture - but did you solder straight on the battery body ?

[AjA]

Hello ealex,
Thanks for head-up, no i not solder it on cell body, since original was not solder on cell body but just glue tape on cell body, in same way i also did but not working, as noobi i just solder two simple wires & thinking it should work, anyways what is my alternate, where can buy this thermistor so i solder it on same place, how i let  this battery workable again?, i try to search schematic of this circuit but not found anywhere, this is circuit board number printer on it (HF CK 77-1 3 94v-0)
that thermistor was looks like this below pic,


your help will be appreciated,
Thanks.