Battery life is relative as each person expects something a bit different, but after spending days with the Echo, I can confidently say that battery life isn’t that good. It’s not terrible, but again, that’s relative. It lasts a little bit longer than the original HTC EVO did for me, and that’s a 4G handset.
While the Kyocera Echo is the first device in what Kyocera says will be a lineup of devices featuring dual-display configurations, and I’m not sure this first try quite hits the mark. It’s thick and heavy, and without a more extensive suite of custom apps and developer support, I just can’t see enough of an advantage over going with a device like the Google Nexus S 4G or the upcoming HTC EVO 3D.
We'd like to point out just how fluidly Froyo cruises along on the Echo, regardless of how many applications we've opened or how many times we've forced it to change orientation. ... If we're being candid (and really, why wouldn't we?), the Echo felt snappier than our Nexus One (with Android 2.3) in all instances, be it in single- or dual-screen use.
Unfolding the phone to reveal its second screen isn’t a smooth step, and the limited number of apps that can take advantage of the dual-screen functionality will frustrate people. For now, one-screen phones will do just fine.