I have the optrel e680
http://www.neobits.com/optrel_k6800_...4.html?atc=gbs
Love it, although I have not used it for a while. Presently not welding.
Sorry, don't want to sell it.
It has a battery. If the helmet is idle for months, you just place it by someone else's welding for 5 min and you are good to go
Revenue Canada gives u a tool allowance. You get the form and have your co sign it. Not $ for $ but the deduction helps