mnash3: Cool.... Thanks for sharing.... I will look to see if Radio Shack has what
Kev Mcgee: OK
Anna Berry: Can you also test re-chargable batteries in this way to see if they need
jorologo: That other meter that you flipped open, was it a HIOKI ?
dial2fast: @NMOEG The Fluke is very accurate. It's the battery that is not accurate.
Also the battery's voltage will vary over time and load. A battery does not
have any type of voltage regulator built in to give you exactly 1.5V.
Likewise, look at 12V car battery....does it really measure 12v, no.....you
might get 13 or 14v. This is never an issue in real world application
because devices that use batteries are designed to work with a +/-
tolerance and does not require the exact voltage.
Demimorph: @addlemej The voltage does not tell you how much 'juice' is left in your
battery, but the strenght which it uses to deliver it's 'juice'. It will of
course show you a low voltage if it is nearly or totally depleted, but if
it is half done, the voltage will remain the same or maybe a little lower
Ryan Jensen: I figured out how to test a cheap AA battery... just bite it if it dents
easy its cheap if it takes forever to dent it its expensive well money is
just a number put that in terms of quality.
SomeDrunkIdiot: @Demimorph A load is a resistance to current flow. The difference is that
in a voltmeter, there is no current flow through the device. It's simply
measuring voltage potential. In a battery tester, there is current flow,
through the load that the tester introduces. If the battery is dead or
nearly dead, it won't be able to keep up with the draw and the meter will
show the voltage that the battery can actually sustain, under load. Hope
that makes sense.
jjenson2006: ...or you could just measure the voltage with the DVM while the batteries
are in the device that they're going to be used in.
Mad Joe: these comments are long
Emperor Penguin: Hi A great video BUT the reading on The Fluke 87 gave 1.6 DCV and the
battery is max 1.5 V,,does that mean the Fluke 87 doesn`t give an accurate
reading ? I thought we would measure a battery V with a
multimeter!!!!!!!!!!!!!!!i didn`t get it Would you clear it up for me ?
dial2fast: @cutaway2000 You have already answered your own question. The tester don't
have a battery inside. So what's powering the tester.....the battery you
are testing. So if your external battery is the source, then your tester is
the load. Internally, it uses resistors to act as a load.
akr3985fan: The Image was a little Blurry for me if it could be sharped up a bit that
would be great Other wise Good Video
Emperor Penguin: Yea..thanks for replying..I just got it.. in real world application devices
use batteries are designed to work with a +/- tolerance.True
dial2fast: @rfn944 you can pick up one of these battery tester at Radio Shack for $15.
It's not worth the time or energy to try to reverse engineer this thing.
Besides that, the gauge has 3 ranges to read Regular, Lithium Button Cell
and NiCd-NiMH. Even if you rig all these resistors on a breadboard, it
won't be convenient to use (compared to this little self contained tester).
Chester Wardan: @dial2fast Micronta?
El Gwat: This is wrong. Voltmeters work by passing current flow through a known
resistance. Basically a battery tester is a dumb voltmeter. So, they are
both "under load." A battery's stated voltage is the nominal voltage
determined by the chemistry of the battery. Once the voltage drops below
the nominal voltage, the battery is nearly spent.
dial2fast: @hamrad88 Tom, thank you very much for your well wishes. You also have a
wondeful Holiday Season!
nofingway1: @yellowcorba1 if you break your teeth...it is a good battery!!!!
dial2fast: yes, the needle goes to the green section of the meter for full strength
daemonk9: can these only tell when a battery is nearly dead? Is there a way to tell
when battery is nearly full?
rfn944: It would be nice to know what load the battery tester is applying. Any
chance you use your other meters, either digital or analog and read the
resistance at various settings on the battery tester. Then if a person has
a VOM and a collection of various 5 watt resistors or a variac around then
they could use the VOM and resistors for a Battery tester.
JSokil: Why didnt you use the battery tester function on the cen-tech multimeter,
its between the DCA and ACV settings?
Demimorph: It would be nice if you actually tell in the video HOW or at least Why is
the battery tester better than the multimeter. People arround the world
almost always give shallow information and I'm getting tired of that
Ben Cobb: Thank you very much for this; I've been meaning to buy one (or both) of the
devices demonstrated in this video, yet I didn't have an idea of what the
"Different readings" mean. Just to be clear that I understand correctly;
It's as if the Multimeter measures the voltage as a DECIMAL (I.E. 1.5 out
of a maximum value of 2), Whereas the Battery tester will give a reading of
the voltage as a PERCENTAGE (I.E. The meter will swing to 75% over a "dead"
reading) Is that right ? Or did I over-think it ?
Demimorph: Oh yeah? and what the hell is that supposed to mean huh? what is 'load'? is
it the current or the voltage? or is it the difference between two things
inside the tester? and why does the multimeter "doesn´t" do what a tester
does. what does it have that makes it able or unable to do A or B, how is
it actually functioning inside?. I type in the youtube browser "How does a
multimeter work" and all I get is these search results on "How to use it".
I don'tlike it
dial2fast: @busog97641 Thank you for watching my video.
EverywhereVirtually: Thanks for doing the video. Very informative!
addlemej: I don't own a battery tester yet, but I do have a multimeter. So my
question is this: if I use the multimeter to measure the voltage of say a
AA or AAA battery, and it reads 1.40, should I throw it out or should I
wait until I get a battery tester? In other words, at what voltage level
(measured without any load) can I definitely say that a AA or AAA battery
is no good? Thanks
cutaway2000: How do you know if the RadioShack's tester is actually putting the
batteries under load? It itself doesn't seem to have a battery to operate
Sean McDermott: Useful video to watch - especially having just watched one showing one how
to test batteries with a multimedia only amongst other uses. Can see the
advantage to having a battery battery tester as well. Thanks.
dial2fast: @ihavetwonipples on the HF multimeter, if you testing the voltage of the
battery, set it to 20 VDC
Alexander Rex Evensen: I found a multimeter which had built-in battery tester for 1.5 and 9 volts,
so I guess that might work as both? =)
medny2: What is the significance of the battery tester testing the battery under
load? That means it's drawing a current from the battery? And that gives a
better indication of how much charge is in the battery than reading the
voltage without a load?
hamrad88: Thanks for all the great videos this year. Have a Happy Holidays and a
Happy New Year. Tom
kimchee94112: Look up "multimeter schematic" and "How does a multimeter work?" on Google.
Look up voltage and current measurements on Google as well.
Demimorph: @dial2fast Yes, let us all keep on knowing less and little about the stuff
that surrounds us. Way to go!
dial2fast: Yes, that CEN-TECH does have a battery mode, but I was trying demonstrate
how easy and inexpensive it is to use a battery tester which gives you a
simple red and green range. There is not only one way to test a battery but
why not use a simple way.
Antonio Caldera: Great info!
Yusifinify: Quick and informative, thank you!
Walking Zed's Push Bike: Whoa, you are amazing, I have often wanted to buy a battery tester, and I
use 'tester' loosely, because I have often had or found batteries, and
wonder if they have any power, or charge to them at all. So, as one last
attempt to figure out whether or not to buy a tester or an amp metre, I
happened upon your video, and now you have [no harm meant here] made the
discussion for me, I will be buying a battery tester now! Again thank you,
very much. Cheers
trAnwhiz: @medny2 Yeah it tests the actual performance of the battery while doing
what it was meant to do; give power.
ghanshyam2999: @dial2fat , nice!! Hey, I have one question, I have Lithium battery and i
need to manage the power to multiple motors through battery and the battery
specifications are 4 amp per hour 14.4 V but it hardly run for 15 minutes
do i right over topic Please help me...
dial2fast: Search Youtube for 'battery drain'. Other Youtubers have done many these
Ion Ionescu: only 5$ the first one? Great one for car use...
dial2fast: @addlemej The purpose of this video is to tell people don't waste your time
with using a multimeter. These battery testers are relatively inexpensive
($16). They typically will work for many decades. It's quick and easy to
use. I am not going to waste my time gathering a bunch of almost dead
battery and measure the voltage and guess whether it's good or not.
Probewitch: Nicely done. Lots of people, even technicians; do not understand that
instantaneous voltage does not indicate capacity.
Merijn Schalks: You also can use the right one as VU Meter.
dial2fast: I see what you are trying to say. The multimeter will give you a decimal
reading of the voltage in DC or AC. Multimeter is mostly used for checking
voltage readings, such as whether a circuit has 12v or 5v or 3v or 0.7v.
The battery tester does not need to have that kind of resolution on it's
reading. It simply just tell you it's good or bad. As to your statement,
you can think of it as the reading translated to a percentage of the
capacity of the battery.
Rob Grant: If you want to check batteries with a VOM you need to check the current
under load. A 1.5 volt AA battery like the one shown in this video should
yield about 500ma when new. If the battery reads 250ma you know it's better
than half used up. No need to use a battery tester. Voltage has nothing to
do with it. Voltage is the pressure that pushes the current. If this is
nothing to push, there will still be close to full pressure.