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DEWALT DC390B 6-1/2-Inch 18-Volt Cordless Circular Saw (Tool Only) $55

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DEWALT Bare-Tool DC390B 6-1/2-Inch 18-Volt Cordless Circular Saw
The DC390B 18V Cordless Circular Saw features 3,700 rpm for fast rip and cross cuts, carbide tip blade to maintain sharpness, and high strength magnesium shoe and upper guard for increased durability.
FEATURES
3,700 RPM for fast rip cuts and cross cuts
6-1/2" carbide tipped blade for 2x cutting capacity at 90° and 45°
High strength magnesium shoe and upper guard provides increased durability
0-50° bevel capacity provides additional capacity for a multitude of applications
Fan-cooled motor with replaceable brushes for maximum power and durability


https://www.ebay.com/itm/DEWALT-1...3AFeatured
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Created 06-16-2020 at 05:28 PM by Junoon123
in Home & Home Improvement (2)
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$55.00

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#2
Who is still buying this ancient 18v tool?
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#3
Quote from Greg-J
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Who is still buying this ancient 18v tool?
Is this that bad for some light cutting of 2x4 every once in a while?

Edit: nevermind. Didn't realize 18v.
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Last edited by metsbillspack June 16, 2020 at 05:48 PM.
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#4
Quote from Greg-J
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Who is still buying this ancient 18v tool?
This was my go to saw for everything. Had 4 batteries to hold it up for use. Sold it for $70 on CL a year ago.
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#5
You can get an 18v to 20v adapter but not really worth buying this saw and the adapter.
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#6
Quote from Greg-J
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Who is still buying this ancient 18v tool?
Each one of those battery cells has two voltage ratings – nominal and maximum. The amount of voltage that a battery produces when fully charged is higher than when it begins to discharge, even slightly. It's actually a chemical characteristic of the lithium-ion system. Each battery cell has a nominal voltage of 3.6 volts and a maximum voltage of just over 4 volts. That 4v max per cell dissapears after just a few trigger pulls of a tool.

3.6 volts (nominal) x 5 cells = 18 volts

4 volts (maximum) x 5 cells = 20 volts

That's it. That's the entire difference in 18V vs 20V Max batteries. It's only a matter of whether the company is using nominal voltage or maximum voltage as its rating.

20v is the same as 18v of any other manufacturer, Dewalt just pulls a cheap General Motors style gimmick to make idiots think 20v is somehow more powerful. Just like 12v is really 10.8 and 40v is really 36v.
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Last edited by MichaelA3457 June 16, 2020 at 07:12 PM.
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#7
Quote from MichaelA3457
:
Each one of those battery cells has two voltage ratings – nominal and maximum. The amount of voltage that a battery produces when fully charged is higher than when it begins to discharge, even slightly. It's actually a chemical characteristic of the lithium-ion system. Each battery cell has a nominal voltage of 3.6 volts and a maximum voltage of just over 4 volts. That 4v max per cell dissapears after just a few trigger pulls of a tool.

3.6 volts (nominal) x 5 cells = 18 volts

4 volts (maximum) x 5 cells = 20 volts

That's it. That's the entire difference in 18V vs 20V Max batteries. It's only a matter of whether the company is using nominal voltage or maximum voltage as its rating.

20v is the same as 18v of any other manufacturer, Dewalt just pulls a cheap General Motors style gimmick to make idiots think 20v is somehow more powerful. Just like 12v is really 10.8 and 40v is really 36v.
We're all so addicted to tools that we buy them simply because they're on sale... I think we're all aware of the battery chemistry and DeWalt's marketing shenanigans.

My comment was more toward the ancient 18v DeWalt tool line itself. Nobody is buying this stuff. It's completely outmoded.

Also, for what it's worth the 18v system primarily used NiCad cells. You can get Li-Ion in that form-factor (or use their adapter), but that product line is synonymous with NiCad batteries.
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Last edited by Greg-J June 16, 2020 at 07:19 PM.
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#8
Quote from MichaelA3457
:
Each one of those battery cells has two voltage ratings – nominal and maximum. The amount of voltage that a battery produces when fully charged is higher than when it begins to discharge, even slightly. It's actually a chemical characteristic of the lithium-ion system. Each battery cell has a nominal voltage of 3.6 volts and a maximum voltage of just over 4 volts. That 4v max per cell dissapears after just a few trigger pulls of a tool.

3.6 volts (nominal) x 5 cells = 18 volts

4 volts (maximum) x 5 cells = 20 volts

That's it. That's the entire difference in 18V vs 20V Max batteries. It's only a matter of whether the company is using nominal voltage or maximum voltage as its rating.

20v is the same as 18v of any other manufacturer, Dewalt just pulls a cheap General Motors style gimmick to make idiots think 20v is somehow more powerful. Just like 12v is really 10.8 and 40v is really 36v.
I don't think the ancient comment had to do with inferiority, but had to do with the fact that the 18v click in and the 20v are slide in. So, anyone who has bought a new Dewalt tool in the past 8 years can not use this.
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#9
Quote from MichaelA3457
:
Each one of those battery cells has two voltage ratings – nominal and maximum. The amount of voltage that a battery produces when fully charged is higher than when it begins to discharge, even slightly. It's actually a chemical characteristic of the lithium-ion system. Each battery cell has a nominal voltage of 3.6 volts and a maximum voltage of just over 4 volts. That 4v max per cell dissapears after just a few trigger pulls of a tool.

3.6 volts (nominal) x 5 cells = 18 volts

4 volts (maximum) x 5 cells = 20 volts

That's it. That's the entire difference in 18V vs 20V Max batteries. It's only a matter of whether the company is using nominal voltage or maximum voltage as its rating.

20v is the same as 18v of any other manufacturer, Dewalt just pulls a cheap General Motors style gimmick to make idiots think 20v is somehow more powerful. Just like 12v is really 10.8 and 40v is really 36v.
The 18v and 20v batteries are essentially the same voltage, but DeWalt had to name it differently to differentiate the new 20v slide in batteries vs the 18v plug in batteries. Imagine the marketing nightmare for consumers if both were named 18v
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#10
Quote from MichaelA3457
:
Each one of those battery cells has two voltage ratings – nominal and maximum. The amount of voltage that a battery produces when fully charged is higher than when it begins to discharge, even slightly. It's actually a chemical characteristic of the lithium-ion system. Each battery cell has a nominal voltage of 3.6 volts and a maximum voltage of just over 4 volts. That 4v max per cell dissapears after just a few trigger pulls of a tool.

3.6 volts (nominal) x 5 cells = 18 volts

4 volts (maximum) x 5 cells = 20 volts

That's it. That's the entire difference in 18V vs 20V Max batteries. It's only a matter of whether the company is using nominal voltage or maximum voltage as its rating.

20v is the same as 18v of any other manufacturer, Dewalt just pulls a cheap General Motors style gimmick to make idiots think 20v is somehow more powerful. Just like 12v is really 10.8 and 40v is really 36v.
Very correct. Except for one slight detail. 18v for dewalt means ancient NiCad batteries. 20v Max is Li-ion. All that you typed up to detail how they are the same is wrong when you're comparing old cell technology to current.
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#11
Quote from jonrmartinez
:
Very correct. Except for one slight detail. 18v for dewalt means ancient NiCad batteries. 20v Max is Li-ion. All that you typed up to detail how they are the same is wrong when you're comparing old cell technology to current.
Dewalt made 18v XRP Li-Ion batteries. DC9182

I owned them.
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#12
If I want to be cutting mostly 2x4s for making gardening structures what type of circular saw should i buy that won't break the bank?
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#13
The battery for this tool was made out of the A123 cell. Not the current 18650 Li-ion cell. The A123 cells are much safer but very low in capacity....and heavier. I have this saw, its good. But I would not buy it now given what is on the market.
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