BLACK+DECKER 20V Max Cordless Chainsaw, 10-Inch, Tool Only (LCS1020B)

Q: How thick a branch can be safely cut with this saw??

Pretty easily cut through a 10-11" tree, and still had a decent amount of battery left for additional cuts on some 4-5" branches.

Q: Could this saw be used to cut thru a standard railroad tie (7 x 9 )

Yes it would, it wouldn't be fast. This saw is only about 1/6th HP. I used my 8"/18V NiCad saw (B&D) to cut/fit 4" landscape timber retaining wall and the size and weight and ease of use made up for any time lost. Scissors can also be used to mow your lawn.

Q: does it come without a battery and charger

Jim, I haven't even opened the package yet, but I presume it does come with a battery if you buy the $129 version, since there is a version without battery for $74. I don't know about the charger, but on the Black and Decker website one version is offered without a charger or battery. Sorry I can't be of more help

Q: Did you get the oiler problem fixed. Its seems like a lot people having a problem with the manual oiler.

I contacted the manufacturer on this. I was told to prime it 50-75 times for the first use (not in the manual.) It did send the oil to the chain. I'm new to it so I don't know if it will keep it up but I prime it a LOT more than 3 times between cuts. The tool is great so I'm willing to work with this problem so far.