no matter how much we don't like them for the time being
EVPs are still going to have a lead acid battery for the 12-volt accessory
battery this does things such as power the main contactor which disconnects the
high voltage is very high power battery in case of an accident or the vehicles
shut off also powers your heat air air conditioning other things like that the
accessories the on-board computers so we're stuck with them for a while but a
growing concern is how long exactly are they gonna last because they're not
that's quite the same as starter batteries on gasoline or diesel powered
vehicles so I just thought I would show you guys a easy way to test for it this
is a digital battery analyzer so we're gonna hook this up and show you how to
and take a look on the badass battery on my 2016 9 TD Model S now the battery in
here was installed in but my vehicle was built january of 2016 and it is
currently july of 2019 so a little over three years old and i don't know how old
the battery was before it was installed it could have been sitting on a shelf or
in a warehouse for a few months so let's take a look so i'm gonna link all yet to
the to a purchase link if you're interested in buying one of these you
can use this on a gasoline powered vehicle to test cold cranking amps or a
sealed lead-acid battery or deep-cycle battery or something such as a boat or
an electric car or even your kids little little razor scooters anything that uses
a lead acid battery this contest it's designed for 12-volt so we're gonna pop
the hood it's gonna be pretty similar for sx3 why some somebody truck I don't
know what the heck's gonna be
so you gotta find
that was a devil's army ducky so you have to find the 12-volt terminals
depending on the year or vehicle those terminals can be in different areas if
you have a 2012 or 13 or early 14 Model S the positive terminal is gonna be
right behind the nose cone and the negative terminal is pretty much
anything that's clean the metal that you can clamp on to mine is a 16 so for me
the terminals are back here underneath a plastic sheet set aside cross it over on
the grass let's move you all a little closer now so on this specific one I'll
get me AB the fuse box here this is the positive terminals right here negative
is right here so I'm going to open up the fuse box
even though Tesla doesn't label anything because they don't want Onur is actually
able to fix their own vehicles okay so we got the positive terminal we got a
negative terminal now we're not gonna touch the negative terminal at the
moment we want positive
and then we want to do the other connection to the chassis so let's see
this nice aluminum bar there but I'm gonna have to lengthen things up like
that they're that they're screen lights up goes through self-test and cycle so
let's zoom in here to the screen when you're ready press ok it's gonna ask you
to select cold cranking amps now that does not matter in this case because
this is not a starting battery what we really want to know is what the
resistance of the battery is so testing
Wow well my 12 volt battery is currently at twelve point three four volts now
ideally we're gonna want that around 13 but the Tesla's do automatically kick in
and charge those as necessary the big number is how many millions resistance
of the battery this is basically your wear gauge if the ohms get too high or
mil alms too high there's too much resistance in your battery as such the
battery is not going to function and at a certain point that's when the battery
is dead and will not know or no longer take a charge what kills 12 volt let out
or any lattice of battery is sulfate build-up and when that sulfate builds up
the resistance goes up power and current is not able to flow so I hit select it
does show me what the cold cranking amp of the battery is disregard up here
because I did not set specific but down here 380 point one cold cranking amps
and for the rough size of this battery and considering it's not a starting
battery but it is a deep cycle battery that would be fine going back to the
resistance considering I'm clamped on to the on to
the bodywork there other one on here we're not connected directly to the
battery we're at six point five nine Milla owns that is pretty good chances
are if we were connected directly to the battery which is doable for me I would
have to pull the front out
so I pulled the front out and actually got direct access to that 12 volt
battery we could get a much better reading I would seriously consider
planning a replacement of your 12 volt battery if the resistance is starting to
read higher than 10 or 15 million ohms and you could probably get functional
life out of it up to about 30 anything higher than that it's a ticking time
bomb that may or may not survive and that's about when the car will start
telling you that your 12 volt battery needs replacement so this is just a
quick and dirty easy way to check the condition of your 12-volt battery
without even having to remove it from the vehicle once again if you're
interested in buying one of these these buggers aren't too expensive and they're
very useful use it on your lawnmower battery use it on if you haven't still
have a gas car you can check that battery use it on your kids power wheels
anything that uses a led acid battery and again designed for 12 volts there
are commercial ones for 24 volts and higher I mean I even use this regularly
to check the condition of my parents golf cart batteries yes it does work so
signing off if you're interesting in one of those links in the description box
below if you have questions post them in the description box below comments don't
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