Attached is the presentation and webinar recording from today's special MCD-TAVT webinar where WT4090 Product Manager Juliet Chon discussed some new terminals (with 2X battery and touch) and some other accessories were discussed.Here is the info on the question about the difference in weights with the 2x:

Terminal w/ Standard Battery:

11.3 oz. (8.4 oz. + 2.9 oz.)

320.3 g (238.1 g + 82.2 g)

Terminal w/ Extended Battery:

13 oz. (8.4 oz. + 4.6 oz.)

369.8 g (238.1 g + 131.7 g)

Holder:

2.5 oz./70.9 g (inc. straps and cushion