iousin009

51 minutes ago, David lings said:

The car is never stationary for more than 18 hours but the average voltage loss extrapolated to 24hrs is 0.3v.

This suggests leaving the car 3 days without running there would be a serous risk of insufficient battery power to start the car.

This is exactly what I was experiencing. If left for fourth day going completely flat.

On 6/6/2021 at 9:32 AM, paulrnx said:

I’d have thought 100% charge was 13.2V based on each battery cell delivering 2.2V in a fully charged state?

Yea it was weird both my old and new replaced Battery gave same readings and with two different meters. If you scan through this thread from the beginning, it should have more numbers. Not sure if any other members have recorded their IS 300h Battery voltage.

On 6/4/2021 at 11:33 PM, David lings said:

Just noticed the response on expected voltage and will monitor the battery voltage over the next few days including when using some auxiliary functions.

thanks

My readings indicate that this Battery voltage is different than the standard AGM voltage chart.

At 12.55 volts my meter indicated 91% charged, so think a 100% charge will be around 12.65

1 hour ago, Herbie said:

At a draw of 50mA, a brand new, fully charged battery would last for 1,020 hours (42.5 days or just over 6 weeks) before becoming completely flat. As batteries get older, changes happen and they lose capacity. Plus, given that we need about 20A to start the car, it would become useless for this purpose well before it went completely flat.

This means that, for 'real world' purposes, you may get 3 weeks out of it.

36 minutes ago, ColinBarber said:

No, not in any meaningful way. Same battery has been used from 2013. Three weeks plus is normal and expected on a fully charged battery in good condition.

You guys reckon I still have some draw issues with my car? I can go to the dealer for further investigations. He'll charge me for investigation.

I'll do more tests when I'm not driving, right now weather is getting good so will be doing long drives every weekend.

I'll do tests with 10/13/16 days parked and will report back here. I have another old car so can manage without driving this one.

After 7 days parked my Battery was showing 60% charged.

Just summarising my thread.

My 2019 IS 300h came fitted with the 49AH panasonic Battery. I was driving quite less (maybe once a week 10-15 minutes)  and got flattened once. Since then even though driving at least one hour a week, was still getting flat if being left for 1 week. This got worse over time and my Battery got Flat 5 times, think it lost around 50% of it's capacity around this time. So was getting flat every fourth day.

Have been to dealer twice, both the time they tested and just sent me back saying Battery is all good!

Then with the help of these forums have done some testing and then went to the dealer again with some numbers at hand, he was finally convinced to replace the Battery. By this time batteries were out of stock. I was given an option to replace at kwik-fit or Halfords. Halfords said they will not touch the Lexus hybrids Battery. Kwik-fit were going to put the battery whose width is 172mm, not sure how as existing Battery width is 125mm!

I waited for Battery to be in stock with the dealer. Was putting noco to work every fourth day.

After replacing the Battery the last two cmments above are the results.

My major finding is (as highlighed in the beginning of the thread by some members) just never get the Battery to go flat, once it's flat it'll end up with all sorts of troubles and have to be replaced.

Thanks to all the members without their help this wouldn't have been possible.

2 hours ago, Lexxieman said:

I was lucky to escape the UK in February and left my 2014 Lexus IS300h in an airport car park for 5 weeks.

The Battery and electrics might both be different. Was the 2014 had the same 45/49AH Battery?

Hi Members,

I'm back again. Got Battery replaced by the dealer on Monday 17th. The Battery model is same as mentioned here

It's a Toyota 45AH, 325A.

Put my noco to work on the same night for 24 hours. Removed it on Tuesday night, then on Wednesday morning did a test. Lexus computer showed 12.3 volts and my Battery tester showed 12.54 volts !

As it's a new Battery thought I'll give it another go with a proper tester as my old tester doesn't have any option of selecting Battery type and input CCA. So immediately ordered Topdon

On Thursday drove the car continously for 2 hours. Parked around 9PM.

Friday around 9PM tested with topdon. Have selected "AGM Flat plate" and input CCA 325 (as on Battery written 325A). It showed health 100% with 91% charged.

Waited for another two days and tested today(Sunday) around 9PM. 78% charged.

Think with this rate in 8-9 days Battery will go down to 50% charged. Will test again after 3 days and then will put noco to work if not driving.

At least the new Battery is not getting flat every 4 days.

Still have doubts about the 5-6% daily drain. Does others have observed similar drain with their IS 300h batteries (45AH)? I'm happy to put noco to work for a day every week, think will have trouble going on a two week holiday, will need to disconnect the Battery in such situations.

Thanks for all the support.

On 5/2/2021 at 12:58 PM, Bootleg said:

Any updates on experience of non Lexus batteries?

Hi,

The kwik-fit Battery which on their website show compatible had width of 174mm, my existing Battery width is 125mm, I'm not sure how they were going to fit 170mm+ width Battery in here, so have hold on. Just waiting for the Battery to become available in a Lexus dealership and then will make a booking.

You need to do some tests and approach the dealer with the numbers then only the dealer will be convinced to replace it, I had to do the same then the dealer agreed for replacement.

As my car is less than 2 years old, I'm reluctant to fit any Battery outside lexus dealership. If you'd like to go for it then bosch recommendation from David should be able to fit, please check the dimensions though.

1 hour ago, Thackeray said:

But the positive is on the left, looking at the front

Thanks, makes sense. The position of the terminal also matters not just the size of the Battery.

Thanks William and Herbie,

I'll go for the Kwik-fit Battery then, start/stop might be an overkill.

Is this the Varta Battery you've searched for?

I'll also check with Kwik-fit if they are happy to fit a Battery bought from outside.

Cheers.

Hi Members,

Quick update.

Apparently batteries are out of stock with an unknown ETA, have rang 6 different Lexus dealerships, they all say the same thing.

My Dealer gave me an option to get a Battery replaced (without invalidating the warranty) with either Halfords or Kwik-Fit. Have approached Halfords they are reluctant to touch as it's a Lexus. They once did it and the car didn't start and have to be towed to Lexus service centre.

Kwik-fit are happy to put in the following Battery. Which looks to be not an AGM

https://www.kwik-fit.com/batteries/search/details/030

Having the feedback of Halfords I'm having second thoughts.

What I came to understand from reading on these forums that, this is just a starter Battery whose function is to only boot the lexus computer and put the car in ready state. There are some peeps who have successfully put various batteries including AGM and Mobility scooter batteries as well. So any Battery should be good to fit?

Have found a close match of an AGM Battery as per my existing Battery dimensions is:

https://www.halfords.com/motoring/batteries/car-batteries/halfords--096agm-start%2Fstop-agm-12v-car-battery-5-year-guarantee-548638.html

I could just ask Halfords to fit the above and I'm responsible if something happens.

Any thoughts/suggestions is much appreciated

Thanks

Cheers for all the draw test videos, I must admit it's still out of my expertise and the car being less than 2 years old, reluctant to play with fuses, I might damage something 😞. Also my car being parked on road, it'll be difficult to try out all these ideas.

1 hour ago, Hadrian said:

I mentioned this elsewhere, but since changing the 12v battery it's been fine and holding it's charge.

If not using the car I still put the charger on it every couple of weeks. It hasn't dropped below 12v yet.

After speaking with the dealer with all the numbers, they agreed to replace the Battery. Hopefully mine also turn out to be Battery fault only.

Cheers.

So today I connected noco for about 12 hours. It went into maintenance mode soon after 3 hours. Then recordings are:

Tester - 12.48

Vehicle Signal - 12.0

It's like the Battery has capped itself at 50% mark and doesn't charge beyond this. With this information I'll get in touch with the dealer, I hope they will accept that some voodoo happened to the Battery.

Will try the repair mode after getting in touch with them. Thanks for help everyone.

28 minutes ago, ColinBarber said:

Just to add, I believe you have an AGM battery so you should be using AGM charging and repair modes.

Cheers, Also on the noco manual it's mentioned "this node is for lead-acid batteries only" I gues AGM is also a type of lead-acid Battery?

Will the doors lock after I disconnect the Battery, keyless lock will work? Guess I can always lock with the key.

After noco fully recharges will try the repair mode, guess to be safe I will need to disconnect the Battery?

Is it ok to just disconnect take it inside the house run repair mode and then get it back and connect? Will it mess up the lexus computer? I don't mind any saved settings getting lost (like Bluetooth connections).

Thanks

9 AM check, after 12 hours.

Voltage again down by 0.2. Have put back noco on as think by night/tomorrow it might go flat. Looks to be consistent drop of 0.1 for 6 hours.

Haha, cheers. I have also used AGM mode to charge, and lexus service centre also confirmed.

2 minutes ago, ColinBarber said:

Given you have a Noco 5, I would fully charge the battery and then do a repair cycle on it to see if it can restore some of that capacity and last a little longer. Otherwise you need to measure the current being drawn from the battery once all doors/bonnet/boot are shut and the vehicle has been locked for 30 mins.

Thanks for the reply, I will do the noco full charge and repair after tomorrows test.

How to measure the current drawn after 30 minutes? Any instructions will be very helpful.

Cheers

9 minutes ago, Herbie said:

The problem is, you've still got the battery connected to the car, so how do you know if it's the battery itself or a problem with the car that's causing it to drop?

 

Yes correct, it can be either of them, I don't have the expertise to disconnect the Battery and test in isolation. After tomorrow's test I'll get in touch with the dealer and explain him what's happening and see what he says. More inclination is towards the Battery as it got flat 5 times until now and even if something major is running in the car don't think it should bring it down by 40% in 24 hours. Tomorrow will test twice between 12 hour intervals.

Checked around 9PM today, after 24 hours. Battery level came down to 12.11, managed to access the hidden services menu (thanks for the help), it's also showing as 11.90. About 35-40% Battery depletion in 24 hours. Will test again tomorrow.

Around 5PM have tested again, the voltage reading was 12.02, which makes sense as in the afternoon it was 11.95 before the start/stop cycle.

Have put my power station in the boot and connected noco 5 left for four hours and at 9PM noco was green, removed it and another test voltage is at 12.51.

I will consider this as my baseline and will keep monitoring every day same time.

2 minutes ago, Herbie said:

Remember, at this stage we know the battery has been flattened a few times so it may be damaged and not able to accept as much charge as it used to.

For accurate measurements you really need to take the battery into the house and put it on charge for about 12 hours or at least overnight so that (a) we know that electricity is only going into the battery and nothing can be draining it or lessening the charge it's getting, and (b) this will give us a known baseline voltage to work with and we'll know it's the best that can be achieved.

Yup, will charge tonight, but won't be in the house, will do it with noco charger while Battery is fitted and then will record the voltage after fully charged, that should be our baseline, then start monitoring.

27 minutes ago, Thackeray said:

I expect it could be 11.95 unless you have reasons to distrust the meter. It will rise quite quickly while in Ready state but an hour or so after turning the car off I doubt it will still be at 12.36. More likely 12.2-12.3. And tomorrow, lower again.

The 14.5 figure isn't the battery voltage. It's the voltage of the charging current coming from the hybrid battery via the converter/inverter. As soon as you turn off the car the 12v battery will be showing the lower figure again.

2 days before when I parked and recorded it was yellow don't remember the actual voltage but think would have been 12.3x, is it normal to go down to 11.95 in 2 days, or something is running (that shouldn't run) and draining the Battery?

I've got my power station delivered, will use the noco charger tonight. Then will start monitoring the Battery depletion.

3 minutes ago, Thackeray said:

The lowest I've seen (and someone else reported this in another thread) is that it will successfully get into Ready state from 11.4v. I suspect it will go even lower but I haven't heard of any reported cases.

While the car is in Ready state the charging voltage from the DC/DC inverter will vary depending on the temperature of the battery and possibly the state of charge of the 12v battery. When the car first starts up I've seen around 13.7v initially, rising to around 14.2-14.4 as the car warms up.

Hi William,

So the 11.95 could be the actual voltage? After starting the car I stopped it after a minute or so and it came down to 12.36, which one will be my current Battery voltage? Do another test again after few hours without starting?