Is there any equivalent of saft battery ls33600b , http://www.farnell.com/datasheets/513072.pdf

One I found is omincel.

Any other good reputed brand for use in oil and gas industry?? Anyone has experience in that?

 

Opened one of ls33600b pack & found this black thing on right side.

Its in series with positive wire. Anyone knows what it is?

 

its 3.9ohm resistor: W22