Battery charge when car not in use

[Mooly]

This post and some follow ups of mine might be of interest to some.

Actual battery voltages in use.

Modern AGM (Absorbent Glass Matt) types should not necessarily see a particularly high resting voltage as that implies the concentration of acid is high, higher than might be desirable for a long life.   

[trevhart]

toyota yaris        my wife has a 2021 toyota yaris hybrid  i was sat in the car waiting for her for 1 hour 20 minutes and decided to play the radio .

                                   she came back went to start it flat Battery .RAC were called jump started it and i asked do we take it for a long run no he said over the next couple of days turn the car to ready position and leave for a hour the engine will kick in every know and again ? .But what if you have no off road parking don,t think insurance would pay up .This must be a problem of to small 12volt Battery fitted to this car .We were planning to leave it at airport parking for 2 weeks but i think i,ll have to buy a booster pack 

[Jasper.]

For peace of mind I carry a Noco booster pack in my Yaris.

[Mojo1010]

On 9/30/2023 at 4:54 PM, trevhart said:

toyota yaris        my wife has a 2021 toyota yaris hybrid  i was sat in the car waiting for her for 1 hour 20 minutes and decided to play the radio .

                                   she came back went to start it flat battery .RAC were called jump started it and i asked do we take it for a long run no he said over the next couple of days turn the car to ready position and leave for a hour the engine will kick in every know and again ? .But what if you have no off road parking don,t think insurance would pay up .This must be a problem of to small 12volt battery fitted to this car .We were planning to leave it at airport parking for 2 weeks but i think i,ll have to buy a booster pack 

There is a big thread on 12v Battery maintenance at the top of the forum. Some members have left it for more than 2 weeks and car still start fine, this would depend on the health and charge of the Battery prior to leaving it. Booster pack is a good idea. The bottom line is turn the engine on if using the radio/fan and power for more than 5-10mins. 

[YarisHybrid2016]

My car just spent a week sat at a body shop with the tailgate open. AFAIK they didn't leave it in READY mode at any time, and no batteries, etc., were disconnected, and it seemed fine when I collected it. I took it out for a 3+ hour drive, so hopefully that gave the 12V Battery a chance to re-charge.

[dannyboy413]

Does the boot light automatically turn off after a certain time - to save Battery power?

[Stivino]

2 minutes ago, dannyboy413 said:

Does the boot light automatically turn off after a certain time - to save battery power?

It turns off as soon as you close the boot.

[dannyboy413]

I appreciate that, but @YarisHybrid2016 says that the car was left for a week with the tailgate open.

[Roy124]

23 minutes ago, dannyboy413 said:

I appreciate that, but @YarisHybrid2016 says that the car was left for a week with the tailgate open.

Open boot, or failure to switch off, was Honest John's go-to when  people had flat batteries 🙂

[anchorman]

The interior lights switch off after 20 minutes.