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This is just a general question, has anybody had any issues with the standard 12v battery not recharging or being discharged quickly. I have just had to replace a 2nd battery on a 66 plate CHR Hybrid. The car had not been started for 4 weeks due to being out of the country and would not start on return, on checking the battery it only had 5.2 v charge left and did not seem to be able to recharge even when the vehicle was started I am just trying to find out if this is a common fault as i will be getting Toyota to find out what is happening to the battery when Co-Vid clears.
 

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I don't know the deep details on the hybrid version. But if it's the same as how modern BMWs operate, there will be some parasitic power loss. Even though I shut off the engine to my BMW, the car never really totally shuts down. It's not uncommon to have near dead batteries after having the car sit for a few weeks. This may be the case with your situation. This would require the use of a trickle charger or pulling the negative battery terminal if you can't get a trickle charger.

Also lead acid batteries do not like to be drained down. This is very bad for the battery. If you use an automated charger, it will not charge a lead acid battery below a certain voltage. I've run across this situation before and was able to charge a near dead battery with my battery charger by setting the charger to manual.
 

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This is just a general question, has anybody had any issues with the standard 12v battery not recharging or being discharged quickly. I have just had to replace a 2nd battery on a 66 plate CHR Hybrid. The car had not been started for 4 weeks due to being out of the country and would not start on return, on checking the battery it only had 5.2 v charge left and did not seem to be able to recharge even when the vehicle was started I am just trying to find out if this is a common fault as i will be getting Toyota to find out what is happening to the battery when Co-Vid clears.
Paul, I have had the same problem with my 67 plate C-HR. The dealer just recharged the battery at first, but it soon discharged: when chatting to the repair centre at Milton Keynes (MK) it was apparent that this is not an unknown problem, and we arranged for the car to go back for 'repair' - and then lockdown happened. Started the car a couple of times in the days after March 23, but when we had left it for five or six days it would no longer start. Now the key fob won't work, we had to dismount the key from the fob to get into the car, and a check of the battery showed 1.2V across the terminals! I have been in touch by email today with MK again, don't expect answer any time soon, but will let you know if and when I get one. Thinking about it, there obviously is a leak to earth somewhere, and Toyota - or at least the Steven Eagell place at MK - know of it and know how to fix it. My car is still under warranty.
 

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Paul, I have had the same issue with my 67 place C-HR. Because of the lockdown, I ended up having to buy a new battery. Toyota / Steven Eagle have agreed at least a part refund. Still waiting !. Anyway I might be able to shed some light on the issue as I have an electrical / mechanical background. The car does use about 30mah for the alarm and keyless entry which will vary when the key fob is near or taken away from the vehicle. Also the battery is very small, only about 45amp hour. While the vehicle does not draw a lot of current from this battery when starting (unless the HV battery is depleted), there does need to be at least 11.5v present for the computer / ecu to boot .In theory this should not pose an issue for a number of weeks standing, however there is another issue that Toyota are aware of. As you probably know, there is a DC-DC converter in place of the traditional alternator to charge this battery. This dertives its supply from the 306v HV battery. This charger is poorly optimised for this small battery and puts out a continuous 14-15v at 6amp regardless of charge state. Unfortunately this cooks the battery over time at causes it to fail early. This combined with the fact we have not been driving every day has highlighted the issue. Once again Toyota / Steven Eagle like to pass the buck between each other and we are left trying to get things sorted. Hope that helps :)
 

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Neutron66, thanks - useful information. BUT what’s the solution? I still haven’t heard from Steven Eagell about getting a new battery: is there any point in getting a “bigger” battery than the 45 Ah one factory fitted?
 

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The solution is to either disconnect the negative battery terminal until you are going to drive the car or get a trickle charger.
 
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