The Seidio 3200mAh Ultra Extended battery is, so far, unique among aftermarket Treo batteries. It's designed for the three 700 Treo models, but will also work in Treo 650s as soon as Seidio releases 650-shaped doors to accommodate it, and they told me those are in the works. For you power users who don't want to worry about dragging around charging cables or remember to carry a spare stock battery with you, it DOES deliver an incredible 77% boost in longevity over the standard 1800mAh battery, but at a fairly hefty price.

The main, and really only drawback comes down to your desire or need to use your 700 in your favorite tight, form fitting case or other accessory, and as I've illustrated and explained here, some will work just fine with it, while others won't.

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Criteria  Rating Design 5 Usability 4 Compatibility with accessories 4 Cost/Benefit 5 Overall (not an average)	Pros 77% longer life than stock Treo 700 battery Comes with Sprint and Verizon doors
	Cons Makes 700 fatter – problematic with cases and some cradles Spartan packaging Expensive