The trick to keeping my sawsall going when cutting/trimming green wood is to keep the blade oiled. I have a Black and Decker electric chain saw I found dumpster diving and an old antique metal case Black and Decker sawsall. For both I keep a can of Bio chain saw oil handy and dip the blade often.
I've turned many a sawsall blade into a pretzel trying to cut green wood, sap is like glue, the oil helps. I'm no newbie using a sawsall, but those raw tooth wood blades always give me the willies. A little oil really helps keeps them sawing smooth.
I really like my old tools, like old friends, I have a couple of chainsaws I bought when Reagan was President.
I have a half garage/shed full of tools I've rescued, reconditioned or repaired, all of them sharp.