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The current (June) issue of Bicycling Magazine has an article "Why Your Helmet Should Be Safer" that discusses the limits of current helmet designs and why it's so difficult to incorporate newer and better technology.
In brief, the author states that modern helmets do a great job of keeping your head intact in major crashes but do a poor job of preventing concussions. He describes why that's the case, a couple of better technologies and why it's so difficult to get the CPSC regulations changed to require them. Worth reading.
I have Tubus Tara and Cargo racks and Ortlieb Bike Packer Plus bags. I prefer the lack of shine on those bags. Durability is excellent. I find the inner pockets useful, but could get by without them. I do not recommend small front bags combined with large rear bags. Weight front and back should be equal, or more on front. I use four rear bags, two on front. I find the Bike Packer Plus bags just the right size. Wayne, The Touring Store, recommends against Bike Packer Plus rear bags on front. I disagreed with that recommendation, and have had no trouble over thousands of miles with my setup. I used to use an Ortlieb handlebar bag, but sold it after using it on part of one tour. I found I could do fine with just the four bags mentioned.+1... just call The Touring Store.
It's straightforward arithmetic. Look at the milliAmpere-hour rating of the batteries. Multiply by 1.2 Volts to get their energy capacity in milli-Watt hours. Divide by 1000 to see it as Watt-hours. Guessing at 80% charging efficiency, divide by 0.80.
An example of two 1250-mAh AA batteries:
(1250 x 2) / (1000 x 0.80) = 3.125 Watt-hours capacity.
The stove at maximum continuous output delivers 2 Watts. 3.125 Wh/2 W = 1.5625 hours
This is a good ball-park figure, perhaps too optimistic on the charging efficiency and you ability to keep it going at max.
That's for a completely empty iPad battery. I think this thing is intended for nothing more than mere trickles; you're just topping off your smaller devices like a headlamp or maybe a less than super smart phone. IIRC, even cooking for four or six people only meant the gas or alcohol stove was running for 30 minutes or so.
Anyone hauling an iPad isn't concerned with how many 2x4s they'll burn to keep it charged. .
The family version of the stove deals with some serious BTU-to-mW conversion, though.