Portable oxyacetylene bottles can also be used for the attaching the cell straps BUT you have to know what your doing to avoid blowing the battery up in your face.
In the past days of older traction battery design one of my battery repair guys used oxyacetylene the other used the resistive soldering iron kit.
It was pretty funny watching everyone disappear to the other side of the building when the hot blue spanner was in use as the battery repair guy did his stuff & I stood there with the fire extinguisher.
Most traction batteries are bolt on cell straps these days, far easier to deal with & repair.
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