Yes that was my first battery, drill, charger combo. I’ve got a 4 amp too.I use a 5ah on the Dewalt Chain Saw. The 2ah don't last very long at all for something with that big of a motor.
I stumbled on to these clones awhile back. They are the real deal.
As far as batteries go I buy the 2 for $60 and they run for hours.
I have at least a dozen and had one fail, I loaned my saw out and my next door neighbor she brought it back leaking, believe she dropped it, It was a couple years old so I just gave her a new battery and pitched the old.
How many cuts? My use I could run it all day but that doesn’t matter slap another battery in and rock on.
Sure is nice knowing no electric, no problem. Quite and fast cleanups