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You may not be aware, but DeWalt came out with an adapter that lets you use the 20V batteries on your 18V tools. I got one last year and it works very well. The only down side is that if you leave the battery plugged into the adapter, the battery will go dead. I don't know what causes it. So, I just remember to remove the battery from the adapter when I am done and I have no issues.Wish I had the 20V stuff, I have Dewalt Drill, older Impact driver (impact screw gun), 6.5" power saw, all 18V. You need to check for pricing differences for the battery packaged with the tool. The one you linked to has 3.0Ah battery. I think Dewalt also has 1.3Ah, 2.0Ah and 4.0Ah battery. My experience, anything less than 2.4Ah battery is waste of time, preferably a 3.0Ah. While the drills aren't too bad on power consumption, (My 18v tools all have the older style 18v batteries, I don't think they make these in anything larger than a 2.0-2.4Ah battery), The circular saw just eats up battery charge. A 20V 4.0Ah battery for that would be just about right. Downside is, the bigger batteries are heavier. Tradeoff.
https://www.homedepot.com/p/DEWALT-...Battery-Adapter-Kit-2-Pack-DCA2203C/206526033