disclaimer: i checked out the google archives. there are a few threads
that address this. everyone seems to think it is OK. that said..
a friend sold me two dewalt 18v batteries which are almost identical
to my firestorm 18v batteries. the only difference is a plastic tab
which prevents proper insertion, but i can take care of that. i picked
up my firestorm from the service place today after a recall repair,
and asked the fellow at the counter if a dewalt battery was ok in the
FS drill. he said that because the dewalt battery kicks out more
current it could damage the FS drill.
before i left my drill for repairs, i had used the dewalt batteries a
couple times and the motor had been sparking up a storm. i dont know
whether this was some other problem, or a dewalt battery
well, i wasnt clear enough. yes, you can see my drill sparking a bit
in normal operation if you peek through the grill, but before i brough
it in to be repaired it was sparking and *smoking*. enough to make the
whole room smell. i've gotten good use out of this drill, and wanted
it repaired. i went to the dewalt service center, ready to pay up, and
they told me it was under recall warranty and replaced both the
recall-defective switch, *and* the motor and pinion assembly, which i
assume was becuase it was damaged and/or charred;)
they did not do the work themselves, so i couldnt ask what the motor
was replaced for, but im pretty sure it has nothing to do with the
thank you for all the posts, youve helped me understand the issues. i
think that we have no definitive answer yet. as a car battery analogy,
i guess that the dewalt battery has not only a higher Ah rating, but
also a higher 'cranking' amp rating, and that under high load
conditions this could be too much for hte motor. when the motor went
smoky on me i was driving 3" drywall screws into hardwood with
undersized pilots, so this might come as a surprise to no one.
thanks for your advice,
Well, I dunno about the dewalt battery situation, but your answer is
overly simplistic and not accurate; batteries have different internal
resistances/maximum current capabilities so it is quite possible that
two batteries of the same voltage will have vastly different current
outputs in some situations, particularly when driving a heavy load. It
is because of this -- for example -- that some old photographic flashes
can be damaged by some of the new rechargables.
Now I will admit that most likely it will work out fine, just wanted to
point out that your logic can backfire.
Wrong. Current is only constant at a constant load. Hog the drill down and
you'll draw more current. It's possible that the DeWalt batteries supply
enough more current than the FS batteries to damage the motor if you really
load it down. Don't know for sure, since I don't know what the difference
between the batteries is.
You are suggesting the FS batteries are really lousy and can't supply enough
current at low resistances. The drill was designed with that in mind, so
the higher capacity DW batteries will damage it.
Gosh, I hope you are not serious.
I'm saying that a battery designed to supply a higher mAH rating than
another is not the same battery despite the fact that both provide the same
output voltage. Read my last sentence before you jump - I clearly stated
that I don't know what the rated difference between the batteries is.
Why is that? I've seen where some independent rebuilders (such as
Primecell) offer higher capacity batteries for replacement of factory packs.
Given the voltage is the same, what does a higher output do?
If you plug a corded drill into a 110 outlet, it works the same on a 15a or
a 20a circuit.
Uh, maybe it runs longer without needing to be recharged? Or, in some
circumstances it might be designed to support higher amp outputs.
The classic example is a battery made for starting a car and a battery made
for a trolling motor. They might be identical voltages and amphours, but
have completely different output capacities.
OTOH, since the DW battery and the the FS batteries are both made to power
pretty similar drills, it is absurd to think that a DW battery could fit a
FS drill, yet damage it somehow.
No, but if you plug a drill rated for 15A into a circuit with a 20A breaker
and bog it down it will draw more than it's rated current. Drills don't
typically have thermal protection built in.
Um the problem with that is that if you bog the drill down with a weak
battery you will stand the chance of burning up the motor. If you have
enough power in a stronger battery the drill may not bog down at all. Sorta
like the advantage of 220 volt over 110 bolt. Less voltage drop and the
motor runs cooler when strained.
I don't think the DW batteries would cause any problems with the B&D
drill, but, simply applying Ohms law to the load in a battery powered
circuit is a little bit of an over simplification. It's quite
possible, and actually likely, that the higher-rated DeWalt 18V
batteries will allow the drill to draw more current, (and produce more
heat & sparks) than the stock B&D batteries.
firstname.lastname@example.org (Lawrence Wasserman) wrote in message news
thanks for the advice, all. i called b&d and they warned that the
dewalt batteries can supply more current, and there is a chance that
it will burn the motor up. given what i learned in this thread, and my
past experience, id say that is exactly what i did with my drill. good
thing the 40 dollar repair was covered becuase the drill was in for a
that said, i guess ill stick with my FS batteries. if anyone wants to
buy a couple used 18v dewalt batteries (old post style) let me know.
(Lawrence Wasserman) wrote in message news
thanks for the advice, all. i called b&d and they warned that the
Um, B&D in in business to sell and make money. How much money do you think
the B&D division will make if you buy DeWalt batteries. That said, I know
that DeWalt offers higher amp rate batteries in the same voltages. Funny
the highter amp replacement batteries have no ill effect on the older
well, given the profit motive i asked here first to get a little
edjucashun. but given all i know now i think they're telling it
straight. besides, i cant imagine the bd division is really in heated
competition with the dewalt folks.
dewalt drills might have better components ('might?' im sure they do)
that can handle a battery upgrade. the new batteries are longer life
(more Ah) or as you suggest- more current per unit time? i know that
there are long life batteries out for a variety of cordless tools, but
that doesnt necessarily mean their batteries will put out higher
currents, and therefore wouldnt necessarily be burning motors like my
Um like GMC trucks are not in heated competition with Chevrolet...
Oldsmobile lost the battle. I assure you there is fierce competition within
the ranks of a group of related companies. The better your sales the bigger
piece of the pie that you get.
The battery is not gong to force the drill to use more current than it
requests. If you feel safer with the same brand batteries go with that as
you set your own limit of risk. Keep in mind however that battery
rebuilders often use much higher amp hour rating cells when they rebuild
your pack. If you burn your drill up regardless of which battery you use it
is because you pushed the drill beyond its limits and not because you made
available more power.
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