I think for high-volume use, higher voltage systems work much better. My 60V Greenworks trimmer lasts long enough on one battery to do my whole ~2/3 acre yard on high power (low works fine for most areas, but high cuts through just a little better).
That being said, if you've got a new(er) 20V DeWalt and can keep all the same batteries, I'd do that.
My current problem is that I have two older 18V kits with drills/drivers/reciprocating saws/circular saws, and replacing both would be $800-$1k. Given that I now need to spring ~$600 for new golf cart batteries, I'm thinking I'll just give the replacement batteries suggested above a shot and see how it goes.
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