When testing my airplane on the flying field i have two main problems:
1.-I can't see anything on my laptop under the sun. SOLVED!
2.-Battery life less than 3 hours. SOLVED!
The way i did to solve this problem was actually pretty simple and now i can get more than 12 hours of battery life when testing and at full screen illumination! This very, very convenient specially when you can park your car near to you.
My super top secret is my new Duracell PowerPak 600
. It has build in power inverter, AM/FM Radio (LOL!), Lamp, 12V car socket and car cable to start it up (just in case).
There's a few considerations you must take care of, in case you want to maximize the performance of this portable battery: You must use a 12V laptop power adapter, is more efficient than using the internal 120V inverter. I was able to find one for my Dell Studio, but not for my ThinkPad (so bad), but the ThinkPad works like a charm under the sun! Even better than the iPhone screen!
Talking about the iPhone I'm just waiting to end my contract and get the new Nexus from Google, it allows you to have internet access from your laptop (tethering for free!) by just using the normal USB, so i can stay connected without paying extra $50 bucks monthly (or just jailbreak your iPhone). ;-)
In other hand the Beta version (not alpha) of the ArduPilot Shield is about to arrive in one week, i hope is ready soon!