[NTLK] MP 2100 rechargeable battery specs

[Melvin Chia]

Hello,
I have managed to rebuild my 2100 rechargeable battery pack this weekend and wired it such that any soldering would not damage the plastic housing any further. I even managed to fabricate the contact to which the positive terminal connects to on the side. I was careless and melted the casing resulting in the original metal contact falling off.

Would anyone know the specs for the poly switch/temperature switch that connects the batteries at the one end? 
I plan on purchasing a bunch so I can indefinitely re-cell the battery pack as I can’t see it surviving too many detachment attempts.
Thanks and sorry for the long-winded messsage.

Melvin C