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The battery in my 2018 Toyota CH-R failed during inspection in 2/2020. Went through Toyota diagnostics and battery was replaced as it was still under warranty but could not find reason why it failed. Battery failed inspection again 8/2020. Again going through Toyota's diagnostic to find out if something is unexpectedly draining battery.
 

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How long are you letting the car sit? I assume when you say it went through Toyota diagnostics that a full electrical system check out was performed?
 

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The battery in my 2018 Toyota CH-R failed during inspection in 2/2020. Went through Toyota diagnostics and battery was replaced as it was still under warranty but could not find reason why it failed. Battery failed inspection again 8/2020. Again going through Toyota's diagnostic to find out if something is unexpectedly draining battery.
I have a similar problem. The first time the battery failed the car had sat in a car park for a week whilst on a holiday and battery was flat on return, just enough power to unlock the door. Car started instantly from a power pack. During lockdown if the car is left for more than 3 days it has a flat battery i.e.9.1 volts. It would take a charge and show 13 volts. However, after 3 days it would be flat. I have not been to the garage with it due to lock down. I purchased a mini power pack which has not failed to start the car.
i'd appreciate any comments on what the problem is. I do not think it is a battery problem. More like a drain from one of the facilities that sit in the background.
 

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This is correct. That's why I asked how long the car has sat without being started. As these cars get more and more complicated with electronics, the more power they will draw when "shut off". My BMW is a classic example of this. It's a 2013 and will drain a battery down in a week or so. If I know the car will sit for a while, I will put it on a trickle charger. The other way to avoid this if you don't have the ability to run a trickle charger is to disconnect the battery by removing the negative battery cable. When you're ready to start the car back up again, you can just reconnect the negative battery cable. Repeated and prolonged deep draining of lead acid batteries are not good. It will shorten the life of the battery dramatically.
 

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This happened to me as well, but I chalked it up to a few things:
  • Who knows how long that battery has been sitting before I bought it
  • I have a dashcam with cutoff voltage at 12.5, which should be SAFE, but it's still a draw nevertheless
  • Left it on a trip to Scandinavians for 1.5 weeks at a friend's apartment complex and it won't start afterwards.

But hey at least it's under warranty and so I know the current battery is good and I haven't drained it either.
 

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I purchased a brand new 2019 Toyota CHR and hardly use it. Having it sat for a week in my parking complex and it didn't want to start. Warranty made it possible to tow it to the dealership (got a new battery - no charge). I don't understand why this is happening to a new vehicle. Old vehicles never had this kind of problem. I've never heard of a vehicle been drained of battery for not using it. Heaven's forbid there's an emergency - you're stuck!!! Not liking this feature at all. What has anyone done about this? What are our options? Thanks.
 

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I purchased a brand new 2019 Toyota CHR and hardly use it. Having it sat for a week in my parking complex and it didn't want to start. Warranty made it possible to tow it to the dealership (got a new battery - no charge). I don't understand why this is happening to a new vehicle. Old vehicles never had this kind of problem. I've never heard of a vehicle been drained of battery for not using it. Heaven's forbid there's an emergency - you're stuck!!! Not liking this feature at all. What has anyone done about this? What are our options? Thanks.
My wife has a 2018 CHR and is suffering similar problems! The dealer which supplied it said, without checking anything, that it would need a new battery and refused to attend the house where the car was sitting, she would have to get it started and bring it to them (Toyota customer service?), that she should drive it every few days (even if she does not need to) and if she leaves it to go on holiday it may not start when she gets back (so much for parking it at the airport!)
Toyota said she could switch the car to 'ready' mode on the drive (but not leave the car unattended) for an hour every couple of days, the car will then run the petrol engine intermittently and keep the battery charged! What chance of it charging when the lights are always on and she would need the heater in this weather!
So much for caring for the environment and reducing her running costs!
Another dealership said there was nothing wrong with the battery and to get a solar charger which can be plugged into the power socket under the centre arm rest!
According to other posts this plug is not live when the car is switched off!
We have both been driving for over 50 years each, have had at least 30 cars and never had this before!
As far as my wife is concerned she has lost confidence in the car (she suggested throwing it in the nearest ditch) and Toyota generally though this is her second one.
 

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My wife has a 2018 CHR and is suffering similar problems! The dealer which supplied it said, without checking anything, that it would need a new battery and refused to attend the house where the car was sitting, she would have to get it started and bring it to them (Toyota customer service?), that she should drive it every few days (even if she does not need to) and if she leaves it to go on holiday it may not start when she gets back (so much for parking it at the airport!)
Toyota said she could switch the car to 'ready' mode on the drive (but not leave the car unattended) for an hour every couple of days, the car will then run the petrol engine intermittently and keep the battery charged! What chance of it charging when the lights are always on and she would need the heater in this weather!
So much for caring for the environment and reducing her running costs!
Another dealership said there was nothing wrong with the battery and to get a solar charger which can be plugged into the power socket under the centre arm rest!
According to other posts this plug is not live when the car is switched off!
We have both been driving for over 50 years each, have had at least 30 cars and never had this before!
As far as my wife is concerned she has lost confidence in the car (she suggested throwing it in the nearest ditch) and Toyota generally though this is her second one.
An update on the above.

Got a solar trickle charger but despite being told that the 12v power socket in the centre pocket is always live it is not therefore trickle charger is useless unless we raise the bonnet everytime we want to use it!
Took the car to Oakmere Toyota in Northwich Cheshire, they installed a socket in the car connected to the battery direct now we can put on the trickle charger everytime we get home. Still not happy with the speed of drain on the battery but this seems to be a solution! Toyota take note, put a charging socket in the car!
 
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