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i filed my I-485 based on my I-130 and the status online I saw from USCIS said they will make decision or update my case on Mid July. My L1 is valid when I filed my I-485 and it's going to expired very soon, the end of this month. I still have a valid B1 though.
Can I legally stay in U.S. Using my B1 and wait until I get my final decision of my I-485?

L1 expiration date: end of May
I-485 filing date: mid April
I-130 PD: current, got approval
B1 expiration date: May 2016.
-When did you get the B-1 status, before/after I-485 filing? How did you get the B-1 status, status change from L-1 within US? If you got the B-1 visa outside US after I-485 filing and used it to enter US, then your I-485 will be denied.

I got my B-1 before I got L-1 and it's valid till May of 2016. I entered U.S using L-1 but not B-1 last time.
-Then, your status has been L-1, not B-1 since you entered US using L-1 visa. But you can still legally stay in US after L-1 status expired. 

i filed EAD concurrently with my I-485 and will do my finger print this week.

can I work legally in U.S.
-Yes if you use EAD.

When I get my EAD based on my I-485?


Can I stay in U.S. using my B1 even my L1 expired?
-Yes even if you don't have a status. Pending I-485 will allow you to stay in US legally.

I just filed my I-485, haven't reach 180 days yet. Can I still stay in U.S using this application?
-Yes. But you can not work until you have the EAD if L-1 expires.
 
Will failure of maintaining my L-1 affect my approval of EAD and my Green Card?
-No.