Manufacturers could take note of this thread. So far, nearly all responses have been 50w or lower, with the lion's share below 40w. While I'm sure (I guess) there's a market for 100+, it's most likely a small share. I'd like engineering to start boasting of extended charge life. Yeah, we get longer time by our choice of wattage on a 200w VW device set to 20-40w. But, it just seems to me (logically or not) the device can't be optimized for lower wattage efficiency while engineered for arc welding ability. High capacity cells, with lower discharge rate capability, are my cup-o-tea.