my 2007 ls 650 just wont starat. plays dead. no click, no whirr, no nothing. i think i may have fried some darned electronic biscuit, but dont know which one.
battery is also dead - so first step is replace battery/ have heard that wal-mart batteries are ok and affordacble. any comments?
next step is figure out what got burned. any guesses? i mean, even with full battery there appears to be no response. battery cant put out more than 9.5 v, wondering if that is the problem or if there is more. any intelligent guess is welcomed.

The Walmart battery is not the correct battery. The vent tube is on the wrong side, and the battery will not go completely in place. You can make a hole on the other end of the battery box for the vent tube, and then all will be well. Or you can go to Interstate Batteries, who will sell you a maintenance-free battery with no vent tube for about $75. Before you install the new battery do as Oldfeller said and charge it up, no matter that the store said it comes precharged.

& Monitor battery voltage religiously while troubleshooting. Have a charger ready to go. In fact, building a pigtail so you can have easy access
to the terminals when ya put that battery in is a great idea. Then you can hook a float charger up with no hassle.
So, you need a volt meter & a solderin gun & some wars & connecturs & all kinda such stuff. Hackin a hunk O harness out from under the hood of a junker is a good way to get a collection of wars of varying size for super cheap,.
War strippers! Dont fergit them thangs,, Now,you can go cheapo & get them what closes around the war & you yank on it OR, you can go Big Time for less than $20.00 & gitchyasome that peenches the war AND nips the end clean & all you gotta do is squeeze the handle,,
I do so love mine & I have years & years of experience dealin with wars & solderin & such & only in the last 3 years have I had the  really good stripper setup> I cant believe I waited so long,,