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yes I am not sure 2.1A can charge.. I have a Patriot Fuel+ 2.5A output (around $25.00 on Amazon).. one of the few with that... I do believe 2.1A would work but I'm not entirely sure. I got 2.5A just to be safe.
This is the battery pack I use: [link]
I charge with a solar panel. The battery pack plus solar panel has gotten me through week long backpacking trips. Just the battery pack will give you enough charges for the two night trip.
Hi also if you want to disable flash do this instead... you can disable it in Chrome using a extension. [link]
When there is flash on the screen you get a box that you have to click on to "play" or open the flash widget. I'm sure there are similar addons for Opera and Firefox.
I believe you can use 2.1 amp powerbanks.. Anker and Amazon both sell high capacity ones (over 20,000mA) for reasonable prices. They should work.. (I think). As for 2 hour lectures you should not even need a battery back up for that length. I have a 12 hour day at school a couple days a week so I run out around half way through unless I charge.
Here is the battery I use... [link]
Keep it mind this won't fully charge the Surface which is around 16,000 mA.. but it will top you off when 5-6 hours isnt enough.
I have a 9000mA Patriot Fuel battery pack... it has a 2.5A output which is important. It helps top me off during long days I can't get to a outlet. You could always buy multiple I suppose.
If you want something a bit bigger then get this...