I've got a question for you. How would YOU write an "honest label" for
a Dewalt power tool that made it absolutely crystal clear that (a) it
was an 18v tool and (b) there was no way to make the tool run in any
useful manner on the batteries made for the previous series of 18v
And just one more thing, there is no reason that an 18 volt battery of a
different chemical make up should not work.
Festool allows you to use any same shape battery, equal or lower voltage
battery, or different chemical make up battery in their cordless tools.
Their Li-ion charger will charge any same shape, regardless of chemical
make up, battery.
What should it matter? You tool does not know what chemical make up of
the battery is nor does it matter.
And if the voltage is slightly different that does not matter either.
At this is all true with well designed tools.
Maybe, voltage to the motor is not as touchy as one might expect.
Although I am sure the "smart" part is how the charger deals with
different voltages and types of batteries. The Festool charger
basically will charge any battery that will fit, regardless of voltage
or chemical make up.
Many Many years ago ,1979ish, I worked for a GM dealership and for
specific reasons did my best to burn out a "defective" 12 volt window
regulator motor, the motor that raises and lowers the window.
I hooded it up to two brand new 12 volt batteries and the result was
that the motor ran faster. Long story short I had the voltage up to 72
volts, 5 batteries, and the motor screamed for 1 minute and I gave up.
I was unable to burn the motor up to that point
I seriously doubt if any power tool would reject being powered by as
much as double voltage. I could be wrong, there could actually be, as
you said, smart circuitry, that would prevent a consumer from doing
this. Again referring to Festool, their drills will work with any
battery that will fit regardless of chemical make up, there are two
extremely different styles and there is no mistaking one for the other,
as long as the voltage is equal to or less than the stated rating for
the tool. This is my charger,
During the mid sixties, I worked for a company that manufacturied
motors for antennas, windows, etc.
We referred to these motors as powered guiltiness.
Part of the spec from the OEM was that the battery fail before the
Fires were another part of the spec. Didn't the door panel catching on
if the motor locked up.
The battery had to fail by definition.
No circuit protective devices were allowed.
You should have seen the test to distruction when a large
cranking motor for a large Cummins was bolted down in a
large bench vice cranking locking the roter and stator
A pair of 8D batteries were connected to the cranked motor
via a 400 amp knife switch that was nailed to the the floor.
The weldinq cable was doing a St. Vitas dance while the
test was in progress.
You will have to define "glow red", but there was lots of smoke
The cool down was over night as I remember.
You are talking about 4/0 CU welding cable.
Remember this is the 1960's.
When I was in school, the college got some stuff from a big company.
There was a really neat spot welder in the stuff. Bunch of Solid state
stuff. But the spot welder was legend in the department.
When turned on - it was RF power dumping in the copper stranded cables
that were 1" in diameter and soft, soft copper. When the tips arc's
melting a spot - the cables would dance about the table. We saw they
were once bolted down and that is what we did. One fear was for the
cables (bare wire) to bounce into each other. Just short of doing it,
but heat expands metal. That was cool.
On 8/21/2015 7:13 PM, Lew Hodgett wrote:
It's my understanding that in deWalt's case the change was mostly driven
by a desire to move the protective circuits from the battery to the tool
and charger to allow a cheaper battery. They took the opportunity to
redesign the battery to a more convenient shape in the process. And
apparently they've standardized it across deWalt, Black and Decker, and
On Thu, 20 Aug 2015 21:21:27 -0500, Martin Eastburn
I would agree about the chargers but unless the protection circuits
are in the tool (rather than the battery pack) there is no reason a
the packs couldn't be made interchangeable. It would be a simple
matter to make the form factor enough different that people wouldn't
be tempted to use the wrong one anyway.
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