Wow, I figured it would cost no more than 1/3 the $179 for an Echo; $60, or $40 for their discount offer. My wife guessed $40 before a discount. Hey folks, it's just a f$&^#@g battery! Get real. I wish them well though, (and be sure to wait for the close out price).
And, if there is real demand, wait for the genuine Amazon battery likely due within six months. Meanwhile, get a long extension cord for the backyard, (assuming your wireless internet signal extends that far).