I bought one of these from Fry's in the US to use for "field repairs".
It was HORRIBLE, takes forever to get up to temp, then as soon as you touch the solder to it, it cools off and the solder sticks to the tip.
By the time you get what you are trying to join hot enough for the solder to bind to the batteries are dead!
I was simply trying to solder a 2032 battery holder into a PCB, it was impossible.
Took it back the next day and got my money back. Complete crap! Don't waste your time or money!