Outsmarting a Smart Battery Charger
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- เผยแพร่เมื่อ 30 เม.ย. 2022
- Most battery chargers these days are "smart" chargers. They won't work unless the battery has a minimum voltage in it, around 3 volts. It's designed that way to prevent you from trying to charge something that isn't a battery. But what if your battery died because you left something on, or you didn't use it for a long time? Well there's a simple way to get around the (not so smart) charger.
Using a modified power supply, you can raise the voltage on the battery just enough so the charger will work. It's a simple way to outsmart the smart charger!
Best information on the spot! Man did I need this for some dead 6 volt batteries right now on this quiet cold Sunday morning 4-21-24 --the first day of the week. (Not Monday, that's governmentally decided, by the way.) Sometimes you have to outsmart the legislators as well as the Chinese chargers.
Like the way you put this video together, Great job!
Wire a 9 volt battery in parallel with your dead battery to fool the charger. You don't have to temporarily charge anything and you unhook it immediately after the charger comes on. Basically the charger is reading the 9 volts from your "helper" battery.
I tried the 9 volt in parallel, it worked just as you said. Thanks Bryan!
@@CECamp
It's a handy trick to have.
Can you put key on AC on and use one of those cigarette lighter plug 9volt deals they sell to preserve computer memory and settings during battery disconnection?
Just curious... I understand me at would just use wires...
@@michaelkulman7095
I don't know about that. I suppose if the voltage drop doesn't cancel out the power you're putting in, then in theory it should work. Be a fun experiment to find out (except for the part of having a dead battery).
@@bryanrussell6679 First, some "Smart" Chargers have a temporary bypass or override function but that seems to be the exception and isn't obvious, it isn't printed on the unit usually and can be multistep, see your manual. So with some chargers, and they do differ, just the initial voltage check can be tricked how I said as opposed to putting a surface charge on or having a booster battery attached for a longer time. One thing to be aware of is that different models require a different voltage threshold for their voltage check so even a tiny alkaline 9 volt battery could fool one unit but not another that might need 10 or 11 or 12 volts. Now if one is using a non car battery like the 9 volt or maybe your drill battery like a 12 volt or 14.4 volt or your mower battery then just use those initially to trick the charger as opposed to leaving hooked up like a second car battery where you could just leave it jumped in to the circuit if you wanted...but don't have to usually...
Also, a "wall wart" power adapter of about 12 volts can be put into the circuit to fool a charger, a so called "smart" charger.
Positive to positive and negative to negative of course, know the polarity of every wire, test it with your Voltmeter if you don't have obvious labelling.
I find this all ridiculous and kind of infuriating but at least there are workarounds...
If anyone out there buys a "smart" charger I suggest you get one with a factory bypass/override function to charge low or no charge status batteries!
Don't reward manufacturers putting out models that don't have this function!
And of course for your own convenience buy such a model.
I bought my unit at a thrift store oblivious to this issue but learned about this a the hard way. I put a 9 volt battery with some tiny jumpers with my "smart" charger just in case...this only will work for some chargers but I have a cordless 12 volt drill and those batteries can work too if you can attach tiny jumper wires...
I've been looking for a video like this for a long time. Thanks!
I saw another video where the guy took a regular 9v battery and jumped it onto the vehicle battery to add voltage to it, and hooked up the charger and it works!
My solution to this problem is hook up my booster pack for 2-3 times, at 20 sec's a time ..... pushes enough base charge into the battery so the charger will recognize it and start it's cycle.
You don't have to wait to charge the battery. Just hook the little battery charger to the smart battery
charger claps and start charging the battery. Once the main battery has enough charge you can remove
the little charger.
leave that little charger on all the time, and it'll keep your battery in good shape.
Thank you the old 13 volt plug trick worked and tricked my smart charger to work ty sir😅
I wish I could remove this "safety" feature all together .
You could do it the easy way take 2 double 2 batteries link them together together an 2 peaces of wire tape one wire to positive an otger wire in negative of batteries hook ur charger up to the battery u wint to charge then touch the positive wire an negative wire on the 2 double a batteries u linked together to create 3 volts to each gator clamp positive to positive an negative to negative an as soon as ur charger senses it is hooked to a battery wth atleast 3 volts in it an kicks in remove ur little battery pack u made now thsts how u trick a smart charger into beginning to charge a total drained battery it works I've been doing it for years
Great video, but I have a question; how can I tell if my smart charger is putting out a charge? It won’t turn on unless connected to a battery, and I’m trying to tell if the charger itself is putting out a charge? If I connect it to a battery, my multimeter reads the battery voltage, not telling me if the charger itself is working???
I wonder if putting the smart charger on with the little charge would start it charging immediately?
I’m sure it would.
Just go get a 9vt Duracell and add to it. As in clip to those widdle round things on top and then clip to the charger leads. - to - and + to +. And I didn't even use clips cause I'm so cheap
That was a lovely video. Since we're on chargers, I have a question. A couple of months ago the alternator on my car started getting wonky. I wasn't ready to change it out immediately, but I didn't want to get caught with a run down battery, so put the battery charger in the trunk. I figured I'd have about a 50/50 chance of being in a parking spot. Before I did that, I wanted to be sure that the charger was fully charged, so I went to plug it in. BIG arc! Checked everything that I knew about, tried it with a different plug. Same big arc. I gave up and time has passed to the alternator has been changed. What was going on with the battery charger?
Hard to say without being there. Q: did you connect the charger to the battery before plugging it in? When you say “fully charged”, did you have a portable charger?
@@HappyWifeAcres Yes, it's portable, no I did not connect it to the battery. I'm just trying to figure out where my logic jumped the rails.
If the clips were touching or close, then yes a big spark would happen. Otherwise, it may be an issue within the charger. There’s often no on-off switch on rechargers so they come on when plugged in. Portable jump starters do have an on-off switch.
@@HappyWifeAcres It may be time to get a more modern charger.
Can you hook up the smart charger with the other charger connected to bypass the 30min 1st charge time. Leave them both on for a little bit then pull the little charger off.
Would that be advantageous at all to charge the battery faster?
I'm sure you could, but I haven't tried it yet.
I admire your optimism, but I do not share your faith in humanity that allows you to believe that most people are smarter than a car battery charger.