KWA should be okay on 11.1v, at least for a while. A good site for inexpensive batteries is hobbyking.com, there are a million to go through. When you're looking on the site, find a pack with the same or similar dimensions to your current battery. A good brand to stick to would be Turnigy Nano-tech, but they're all decent.
When you're looking on the site, they won't say voltages but an S-count. The number before the S is the amount of cells in that particular pack. 2S = 7.4V, 3S = 11.1V.
Remember to get a lipo alarm and lipo-capable charger! Check out the lipo sticky somewhere around here for safety concerns, they are safe as long as you're not a derp!
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