in this video i'm going to show you
how to charge say a car battery a bike battery a boat battery that has very
little charge or it's completely dead before you perform this method it's good to check
if the battery can actually be topped up i have a video on this i'll link it in the description
below basically the cells might have run dry and they just need topped up with distilled water in a
closed battery a non-serviceable battery like this we don't have the opportunity without either
drilling in here or avoiding the warranty or anything like that so these are supposed to
be closed cells and you're not supposed to top them up at all so this is what usually happens
you hook up the charger to your battery you put it on a 2 amp charge and after one or two seconds
you'll get an immediate fault and it won't charge so i'm going to show you
a trick on how to fix this so good working battery and you know
fully charged it's working correctly after sitting for a couple days maybe even
longer it should read at 12.6 volts in or around that mark so you can
see this is a perfectly good battery and the battery we're trying to charge
which keeps faulting out with the charger it reads only 5.54 volts so this uh
battery is pretty low so less than 50 so what we're going to do here we're
going to get a set of jumper cables and we're going to connect the batteries together
so positive to positive negative to negative okay so we just have the batteries connected
together in PARALLEL i'm just going to probe the half dead battery now on the terminal
itself you can see it's taken a very high average of the two batteries and when we connect
the charger to these in series it's going to be enough voltage for the charger not to fault out
and then start charging both batteries together so what we do now we just take our battery charger
and connect this to the end it doesn't really matter where we connect to because they're
in PARALLEL so i'm just going to connect the charger there so it's going to look like this
and then we're going to plug in the charger so now with our battery charger we can go to
2 4 even 6 amps it doesn't fall towel because the voltage reading from both of them again reads
around 12.5 volts so that's perfectly acceptable and it won't fault out so one thing you might want
to know is is my battery charger working now this same exact method you can use to test whether the
alternator in a car is charging the battery while the engine's running so while it's charging we've
got a two amp charge going into this so we're just gonna probe the battery terminals and when we
do that it reads 13.12 volts now when this is not charging it reads around i think around seven
volts right now so that confirms it's accepting a charge because the voltage region is six volts
higher and when it's charging it will read higher when the charge is switched off it will drop down
to its actual current charge after a few minutes so why does this fault feature exist it's really
just a safety feature because if the battery is compromised and it can't accept charge then
it just falls out to prevent overloading or you know like a mini sort of disaster um so i
recommend doing this in an outside area you know just to be safe i've never had any problems
with this at all when doing it this method one thing just don't leave it charging you
know for hours and hours unsupervised just check it every hour you have a multimeter
to check the voltage etc once this battery has received enough charge you can actually
disconnect the jumper cables and continue to this uh to charge this battery by itself this is just a
booster to get it uh you know get it going really and last thing i'll leave you with always always
charge your battery with a low charge so um a two amp setting here um if you slow trickle charge
it that is the safest method and also make your battery last longer if you start charging with
a high sort of amperage here they tend to charge fast yes but they don't really last as long and
again since these are connected in series i think two amps you know really low charge is a good uh
setting to put this at so once we've left this for say an hour or so we can disconnect these jumper
cables and this will begin to charge by itself so i've left this on for about an hour and a half
now we're just gonna put it back on the two amp charge and it's not faulting out so we're good to
go really some charges depending how much you pay they'll actually stop charging when it's reached
its capacity and again that'll be the full light here so uh again i'd prefer to monitor them i
don't really trust the checks in these cheap charges but it's just something to know so i hope
this tip helped you and yeah thanks for watching
