It seems it's going to be a very cold long winter. Already -25 this morning

. I'm having this bad feeling i'm going to be facing more power outage then usual. I was thinking about getting the Duracell Powerpack 600. Anyone else try this?
http://www.duracellpower.com/backup-...rpack-600.aspx
or the Duracell Powersource 1800?
http://www.duracellpower.com/backup-...urce-1800.aspx