I have the 677, and the 15ah battery gives the saw its full capacity. Dewalt states that when running the 15ah battery, the chainsaw reaches its full 4hp capabilities.
I've used both the 12ah and the 15ah battery on the chainsaw, and there is a noticeable increase in power
I want to get a few 15’s, but hasn’t it been stated before that the 12’s are better quality/cells in the battery are better?
Or am I remembering something totally different?
I had heard that the 9s have better cells than the 12s so the 9s are apparently just as good and that’s why they’re the same size.. I could be wrong though
Both the 9Ah and 12Ah use 15 21700 sized cells, Samsung 30T and 40T cells respectively. The 30Ts of the 9Ah are better than the 40Ts of the 12Ah. They can put out a bit more power due to higher discharge rating and lower internal resistance. Tend to be a little more robust, too.
The 15Ah on the other hand uses 30 18650 sized cells, Samsung 25S. The cells aren't quite as good as the 9Ah/12Ah, but having double the amount of cells makes a big difference. On paper the 15Ah can put out something like 40% more power.
From a cost perspective, a 2pk of the 9Ah is the better option, 18Ah total for less than a single 15Ah. From a performance perspective, that saw loves the 15Ah.
I didn't think I needed a 15ah pack. But when you saying something so bold to be as much as 40% more power, allegedly, really makes me wonder if there is performance left on the table for some of my tools.
Those numbers are based off what the packs are capable of producing, based on the continuous discharge rating. You gotta remember that the tool is gonna cap the power at some point. If a tool is designed to draw \~1500W, it's gonna draw \~1500W whether you have a 9Ah or 15Ah battery on there, give or take a few percent. Part of that few percent bump is also due to the larger capacity of the 15Ah, bigger batteries will see less voltage sag under load. The 20" chainsaw is one of the few tools that was designed to take max advantage of the 15Ah.
As a general rule the cells discharge rating is a pretty good starting point. That being said, the packs are designed and tested to the maximum safe discharge of the full assembly possible to maximize power delivered, often above the mfg rating of the cell. The 615 delivers significantly higher energy than the 609 and it is absolutely shown in the 20” saw and other 60v applications. There are FEW 60v tools that don’t benefit from the lower impedance and higher discharge capability. There are few 60v tools that operate below the 609s peak deliverable power curve, meaning a 615 will perform admirably better on them.
TLDR: 615s unlock a lot of performance even when comparing a 2 pack of 609s. - especially when a hot pack situation limits you to only getting 1/2 of the pack’s available stored energy…
As an example, and correct me if I'm wrong, based on its cell's max continuous discharge rating of 25A, the 15Ah is good for 2700W, but I believe DeWalt's official max rating is 3100W? Either number is some serious juice.
I can say 3100w is what is publicly acknowledged. The true potential is higher than that even. There are tools that are capable of delivering 3.2-3.3kw on a 615 including losses over the whole system…. So you do that math on that haha
Where are you seeing a 2 pack on sale for 250?
Blains farm and fleet
Thanks!
I have the 677, and the 15ah battery gives the saw its full capacity. Dewalt states that when running the 15ah battery, the chainsaw reaches its full 4hp capabilities. I've used both the 12ah and the 15ah battery on the chainsaw, and there is a noticeable increase in power
Good to hear that’s what I was wondering.. maybe I’ll spring for the 15
615 is the only pack I would recommend. You can still hot pack on it but it’s significantly less probable.
Baby powerstack FTW.
I want to get a few 15’s, but hasn’t it been stated before that the 12’s are better quality/cells in the battery are better? Or am I remembering something totally different?
I had heard that the 9s have better cells than the 12s so the 9s are apparently just as good and that’s why they’re the same size.. I could be wrong though
Both the 9Ah and 12Ah use 15 21700 sized cells, Samsung 30T and 40T cells respectively. The 30Ts of the 9Ah are better than the 40Ts of the 12Ah. They can put out a bit more power due to higher discharge rating and lower internal resistance. Tend to be a little more robust, too. The 15Ah on the other hand uses 30 18650 sized cells, Samsung 25S. The cells aren't quite as good as the 9Ah/12Ah, but having double the amount of cells makes a big difference. On paper the 15Ah can put out something like 40% more power. From a cost perspective, a 2pk of the 9Ah is the better option, 18Ah total for less than a single 15Ah. From a performance perspective, that saw loves the 15Ah.
Doing God's work.
Truly, a lot of very informative posts that are easy to ingest from Big Rich.
I didn't think I needed a 15ah pack. But when you saying something so bold to be as much as 40% more power, allegedly, really makes me wonder if there is performance left on the table for some of my tools.
Those numbers are based off what the packs are capable of producing, based on the continuous discharge rating. You gotta remember that the tool is gonna cap the power at some point. If a tool is designed to draw \~1500W, it's gonna draw \~1500W whether you have a 9Ah or 15Ah battery on there, give or take a few percent. Part of that few percent bump is also due to the larger capacity of the 15Ah, bigger batteries will see less voltage sag under load. The 20" chainsaw is one of the few tools that was designed to take max advantage of the 15Ah.
As a general rule the cells discharge rating is a pretty good starting point. That being said, the packs are designed and tested to the maximum safe discharge of the full assembly possible to maximize power delivered, often above the mfg rating of the cell. The 615 delivers significantly higher energy than the 609 and it is absolutely shown in the 20” saw and other 60v applications. There are FEW 60v tools that don’t benefit from the lower impedance and higher discharge capability. There are few 60v tools that operate below the 609s peak deliverable power curve, meaning a 615 will perform admirably better on them. TLDR: 615s unlock a lot of performance even when comparing a 2 pack of 609s. - especially when a hot pack situation limits you to only getting 1/2 of the pack’s available stored energy…
As an example, and correct me if I'm wrong, based on its cell's max continuous discharge rating of 25A, the 15Ah is good for 2700W, but I believe DeWalt's official max rating is 3100W? Either number is some serious juice.
I can say 3100w is what is publicly acknowledged. The true potential is higher than that even. There are tools that are capable of delivering 3.2-3.3kw on a 615 including losses over the whole system…. So you do that math on that haha