Power selector between USB or battery

Why you used zener, guess you were looking for schottky diodes which they are NOT. Lenny promoted them some time ago as schottky which was his craptronics fantasy. Dont follow him if you had in the past.

even you need the symbol which is also only close and not exact a schottky one, you can simplify this circuit to diodes only? Check this, the highest voltage wins, http://everycircuit.com/circuit/6583588001415168

@hurz is EC’s most notorious cyber bully, don’t believe his opinions, he lies a lot!

Beware of lenzrulz. He is the most notorious liar, spammer and hypocrite on EveryCircuit. He steals schematics and descriptions from others, re-publishing them without giving credits. lenzrulz projects himself as victim, while he's creating resentments by his very own actions, and has been doing so for years. Be wary when he presents himself as tech-savvy individual - his incompetence in the field of electronics is striking. But don't take my word for it, see for yourself. Should you engage into debate with him, keep a hardcopy or screenshots of what was said - he may manipulate his comments. He continuously reposts his crappy spam under the pretext of "cleansing of defamatory comments", but has been observed doing so with crap which didn't even contain a single comment at all. As self-declared master of debates (rather, master of hot air, moronic "Lol"s, and talking to himself through sock puppet proxies such as foul-mouthed Tedski alias Madski, who spreads lies like his puppet master) he doesn't hesitate to fabricate fake "evidence" to support his lies. He is not interested in Electronics, but in provocation, and the reason for the toxic atmosphere on EC, even though he likes to blame others, naturally.

@lenski knows nothing about electronics, but terror, and lying is one of his weapons in his little war 24/7 on everycircuit.