A year or two ago I wound up calling manufacturers asking if they had
any battery powered drills that could use a Pb 12v car battery. They
all said no
saying the low impedance would burn out the motors. I was surprised
given the current capability of NiCd. Now the Li are on the scene.
Anyone heard of a drill capable of using the car battery?
Anyone used a car battery with a drill?
Much voltage drop so make the lines short or larger. Further, you need to
fuse the lines way down preventing short circuit (meltdown or explosion) of
a few hundred amps at the drill.
There is a cordless drill out in the market a few years ago that could use
either battery or an external power supply - don't remember who make it but
should be easy for the DIY to do.
Not exactly. 12V static from the drill battery a little more static
from the car battery (most will be about 13V) then put the drain on them.
The drill battery is likely to drop down to like 9 Volts quickly (internal
resistance) but the car battery may only drop down to 12V. That difference
could burn a motor that was not designed for it.
Now my questions is why not just use the 12V charger and charge one
battery while you are using another?
I have a cheap 12V drill that is interchangeable with a 18V power pack. No
problems so far, but I don't use it much either.
Voltage drop is huge on a 12V system and if anything should be ok for a 12V
drill. I use #4 cables from the 12V battery to the car power amp for the sub
woofers - less than 10' of run at that, and mostly for voltage drop.
all batteries have an internal source resistance(impedance,or Z) that
limits how much current they will output.Some types have much lower
internal Z than others.
electric motors draw their highest current at stall.
IMO,the main worry would be burning out the speed control in the
trigger;they are only designed for a set amount of current capability,and
may not have overcurrent protection.
Any 12V car battery could run any 12V dc drill or a 6V motorcycle battery
could run a any 6V dc drill. If you're handy, all you need is a disconnect,
2 wires and a fuse to protect you and the drill.
New battery technology is now pretty good, something like 2,000 charge
cycles vs. 500 cycles, 3x the run time and 1/2 the weight of a NiCd - that's
the hype anyway. Why bother with a hefty lead acid that you shouldn't use it
indoors without ventilation?
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