Old Weller 80 watt with hammer head. I used to use it for soldering Nicads directly to each other in a jig. Heat end of each cell at the same time and slam them together gently. Pre tinned, of course! Made 6 or 7 cell sticks.
otherDoc
R/Cer with 40W for general soldering and 80W with hammerhead tip as above for use prior to LiPos sweeping Ni-XX cells off the map...
In most cases, it is better to modulate heat input by changing tip mass than by changing wattage. Mass sinks heat into the joint quickly whereas wattage alone requires additional time...
Old Weller 60 watt soldering station with 700deg magnetic tips. It's a bit of a dinosaur but still works well. I've been lusting over some new leadless stations for ROHS work but haven't had a big enough job come in to justify the dollars spent.