TG Daily has news of the Xantrex Powerpack 100, an interesting device that can provide a few extra hours for AC, DC, and USB powered devices. It’s rated for 80 watts of continous usage, and according to TG Daily, can provide up to 2.5 hours of extra battery life for laptops and probably more life for less power-hungry gear..
It’s rechargeable, and retails for around $120. The Powerpack 100 (along with other Powerpacks) can be found here (Xantrex.com).