I just bought the DCS391M1 kit with 4.0 amp battery in Dec 2014 but I didn't keep the box to verify the 5250rpm.
But I can confirm that my saw performs differently depending on which battery I put in it. Looks like the motor was changed to take advantage of higher capacity batteries.
When I run the saw with a 2 amp vs a 4 amp battery, the saw definitely spins faster, has a higher pitched sound and feels like there's more power with the 4 amp battery.
Unfortunately, it also seems that the battery drains a bit faster. After ripping 8 to 16 feet of 3/4" plywood with a Diablo 40 tooth blade, it's already drained 1 bar off of my 4 amp battery. I was expecting better battery life with a 4 amp battery but I do recognize that I'm using a finishing blade on the saw. On the other hand, the cuts are very smooth.
DCS391P1 Dewalt 20v Circ Saw with 5.0ah battery
in Dewalt
Posted
I just bought the DCS391M1 kit with 4.0 amp battery in Dec 2014 but I didn't keep the box to verify the 5250rpm.
But I can confirm that my saw performs differently depending on which battery I put in it. Looks like the motor was changed to take advantage of higher capacity batteries.
When I run the saw with a 2 amp vs a 4 amp battery, the saw definitely spins faster, has a higher pitched sound and feels like there's more power with the 4 amp battery.
Unfortunately, it also seems that the battery drains a bit faster. After ripping 8 to 16 feet of 3/4" plywood with a Diablo 40 tooth blade, it's already drained 1 bar off of my 4 amp battery. I was expecting better battery life with a 4 amp battery but I do recognize that I'm using a finishing blade on the saw. On the other hand, the cuts are very smooth.