Install Trickle Charger on LEXUS NX Hybrid

#lexusnx
#lexus
#12voltbatterycharger

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NOCO Genius 5 trickle charger

This video I install the NOCO Genius 5 trickle charger on my 2022 Lexus NX450h+. This trickle charger will help maintain the 12V battery on the NX450h+ as I drive short distances because I drive short distances during the weekdays.

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[re-tiredsteve]

Great Video LSFT, thanks again for this! I would agree a battery tender is almost a must for these types of vehicles unless you regularly drive longer trips.

Please everyone keep in mind though that we're looking at the complete electrical system at work here and it's way more complex on modern cars. Toyota and all other manufactures of hybrid vehicles have made designs that are utilizing both a high voltage 'traction' battery which primarily does all the propulsion work and then add a 12 volt battery to still do all the other electrical requirements for the vehicle to function.

So you have a monster of a battery with high voltage and a tiny one as well. They utilize a dc/dc converter when determined ok to allow the big battery to supply the little battery assistance with the 12 volt requirements. This is where the engineers decide how to 'manage' all the stored energy. It would be simple to allow the big battery to keep the small battery charged no problem, always providing you with a fully charged 12 volt battery to 'start' your car. But they don't, for safety reasons I'm sure, allow a circuit like this to 'stay on' constantly and deplete the bigger battery, plus it would look like your EV range is mysteriously dropping off when you park your car.

In simple terms they 'sacrifice' the 12 volt battery and let it deplete when all systems are not running. At some point things change. I'm assuming when they're confident that they can begin to allow the converter to send a charge to the 12 volt battery happens when you are going to drive the car or, put it in on/run mode, which gives the order to have the car ready to drive on your command including using the gas engine when needed to produce more energy.

A healthy fully charged 12 volt lead acid battery at rest with no draw will ONLY make 12.6 volts. Anything above that and it's being assisted by other means, namely a regular alternator in an old fashion system, or the dc/dc converter in a new one. So when your voltmeter plugged into your 12 volt socket shows more than 12.6 volts, it's already being 'assisted' by the charging circuit. This is why your trickle charger and it's internal circuitry is needed to determine the health of the battery. For example, at 12.4 volts, your battery will be at roughly 75% charge OR has begun to have a draw on it. At 12.2 volts it will be at 50% charge and at 12 volts it will be at roughly 25% charge. Constantly having your 12 volt battery remain at less than full charge will reduce it's life and will need to be replaced sooner than optimum lifespan, which is typically 4-6 years.

I suspect if you opened the (powered) back hatch to attach a multimeter to each terminal of the battery to test it, you would have already added a 'draw' on the battery which will be included in your reading. Same is true if you're sitting in your car looking at a multimeter plugged into your 12 volt outlet. Some interior lights or displays or other safety circuitry will be on etc. With these vehicles the only way to truly test a battery's health is with it completely disconnected meaning nothing is connected to it at it's battery posts or through the obd port using a battery test procedure from a reader or laptop auto software program like a technician would have.

[jefffraser]

Hi there, I just wanted to thank you so much for this video, it really help me connect our Noco Genius 5... I needed everything you used as well and found it all at CanadianTire.
Our new Toyota Venza went dead last week and what a pain getting boosted and having the dealer clear all the codes triggered by the dead battery.
Same thing happened to us, letting the car sitting too long and not enough highway driving to charge the 12V battery.
Thanks Again!!
👍🏻🙏🏻

[jean-marcdelbos]

Thanks LSFT for this reference video on the battery problem, that has happened in various cases with the first winter for our NXs. Spring is coming soon!

[chadcostales]

Wanted to share that a trickle charger will also work going through the jump point in the engine bay. Hooked the positive up to the point in the fuse box on the right and the negative to an unpainted surface (one of the nuts on top of the strut). I only had a 1.5A charger so it took a bit longer but it did the trick. Love the vids, keep up the good work!

[re-tiredsteve]

Just to add a few details. I have '22 NX350h that I last drove not 3 days ago for a total of 40 kms of mixed highway and city driving. So 20 kms there, an hour wait then 20 to get back home. I just put a multimeter directly on my battery posts while it sits in position in the back compartment under floor. It was only at 11.50 volts! So the marker lights were on, I had turned off dome lights though, obviously it would have been in a quasi 'accessory' state for me to unlock it and raise the power hatch. I would have thought my little adventure would have been enough to top it back up plus a little depletion over 2 days but not down that far! I have put it on my charger now to bring it back to full state of charge and I do have to travel some 300 kms tomorrow so I'm gonna check readings over next few days to see how much depletion is occurring.

[RickA-Z]

Thank you very much for your channel and this helpful video. Our 450h+ is arriving early in 2024 and I will stay on top of the battery health from the get-go by doing exactly what you did.

[martinpanganiban]

Thank you LSFT.. this is a great & very helpfull video for phev owners. i might install one also on my NX 450h+ especially dealing with very cold winter here in montreal.. 👍

[BigX]

Had the same problem with my 2016 optima SX. Battery was over 300$ to change. I was doing 6-7000km a year. Just bought a 2023 RX350h… gonna look into one of these.

[stephenpotts]

Hi, just to let you know, if you only do very short journeys, or use the car infrequently the battery maintainer is best plugged in always when you are not using the car it will maintain the battery to it's optimum level and the battery will stay in perfect condition for many years. Also the original battery leads with the Noco 5 amp battery maintainer are wide enough for you to have enlarged the holes with a M8 drill and saved you the expense of those additional leads. Thank you.

[kohkae]

This is a good video, thanks. Subscribed

[RickA-Z]

Hi LSFT. Picked up our NX450h 3 weeks ago and I installed the same trickle charger as you today. When I plugged it in it was only 25% charged. Do you think this is surprising for a new vehicle? I’ve been trying to drive longer distances and trying to use the engine as much as possible. Other than this sketchy battery, it really is a fantastic vehicle.

[darrenheading]

Why don't you just plug into 12v power outlet in the boot. It's already there ready to go. Just make sure current output of charger is less the power outlet fuse

[shamimlateef]

Seems like a major oversight by Lexus engineers if they haven't included trickle charging the 12v battery when you plug-in to charge the main battery.

[PM-mbdr]

What battery tester are you using in the video? And great work as always! I always look forward to them!

[johntobin]

LSFT, yesterday my 12V died too, yet I typically drive 10-20 miles RT on most days. Like another subscriber asked, I too wondered if EV mode (how I drive 95% of the time) was really charging the 12V battery, or if the NX needed to be driven in hybrid mode. Otherwise, I'm stumped on why my battery died if both EV and HV modes charge it. I should note, I live in a place that rarely drops below 40°F or exceeds 90°F, which I assume should be a benign environment for the battery.

Regarding your NOVO setup: how often and for how long do you typically connect the NOCO to your 12V battery (e.g. every night, 3 nights)? When running the NOCO, I assume it must be plugged into an outlet; if so, is your hatch door open to run NOCO's power cable to the outlet?

Thanks for your insights on this and the many other topics you cover on the NX 450h.

[Rajonrondoo]

Lexus sells a battery trickle charger accessory for $500 why wouldn’t you guys just get that? And sorry I didn’t watch the whole video just some parts I’m wondering why this is even needed? Does the battery die fast?

[MrOP]

I think your 12V battery is not in shape anymore. I think it has been drained to a couple of times, and sadly the lead acid batteries do not handle well this situation. I had this problem on my 2005 Prius, it was a which was on display for some months and had drained the 12Vbattery, and when Istarted using the car, I had similar issues some months and finally I had it replaced, and the problem was solved. The trickle charger is good idea, and especially with a new battery it will make lifetime much better.

[stewartpenny]

You need to get out more, LSFT. The first 10 days I had only the 240 V charger. It was soooo slow. I found myself working for the technology, not the technology working for me. Every time I returned home, I plugged it in even to get an hour of charging. Then Lexus installed my type 2 charger and it takes less than 3 hours from dead empty. And I am diverting my solar PV so 18 kW costs me A$0.90. I can use Lexus’ navigation or waze, or Apple maps or google maps. Do the last 3 slow down on corners when in cruise control? The Lexus nav does. Another very important question. It is normal for the car’s odometer to show a higher speed than the gps speed. From what I can see, using Waze, the discrepancy could be as high as 6kph. That is very significant. On a highway I can set the speed on the cruise control to 120kph in a 110km zone and only be <4kph above the limit. Is this your experience?

[jaykahekili]

the setting has
12 v
12 v agm
12 v lithium ion
NX350 H
what setting to trickle charge?

[ralphjohansson]

Hi LSFT! I have the same issues with my 22 - 450h+. 3 times dead battery. My concern is the stationary battery drain, approx. 0.3 volt/24h. due to that the battery will not take charge to than12.5V. Do you know how much stationary drain one should expect.
Also, when charging the traction battery, i get + 0.3V in trickle charge to the 12V battery.
I.e not much. I wonder what is your experiences.
Thanks for your informative videos.