12V battery flat

[sportse]

The suggestion in the manual that the 12V battery will last 3 months seems way off - I wouldn't want to leave the car for any more than 3 weeks! After 2 weeks I'd expect there's a good chance the breakdown service may be required for a jump start.

I assume the 12V battery is also the same type (AGM?) as the new stop/start batteries so permanently damaged if it's allowed to run down too low.

[Steve_M]

I assume the 12V battery is also the same type (AGM?) as the new stop/start batteries so permanently damaged if it's allowed to run down too low.

Mk4 battery is just a standard flooded battery (Panasonic 44B19L-MF) not an EFB battery as used in Idle stop cars.

[sportse]

I assume the 12V battery is also the same type (AGM?) as the new stop/start batteries so permanently damaged if it's allowed to run down too low.

Mk4 battery is just a standard flooded battery (Panasonic 44B19L-MF) not an EFB battery as used in Idle stop cars.

Thanks, that's good to know - the last battery I bought for a Volvo was £265! Someone with the same engine a few years older, before stop/start, was only paying £85 for theirs.

[nowster]

The suggestion in the manual that the 12V battery will last 3 months seems way off - I wouldn't want to leave the car for any more than 3 weeks!

The three months recommendation is not the 12V battery but the high voltage lithium ion battery pack in the back.

You do not want to ever let that go flat.

[Hugh R]

The three months recommendation is not the 12V battery but the high voltage lithium ion battery pack in the back.
You do not want to ever let that go flat.

But no mention anywhere by Honda of the 12v. battery perhaps being flat after 3 months? Interesting.

[sportse]

The three months recommendation is not the 12V battery but the high voltage lithium ion battery pack in the back.

You do not want to ever let that go flat.

Yes, if it's like the Toyota ones there were only a handful of the special dealer-only chargers in the country that could attempt to recharge a HV pack after it had gone flat.

And if the charger didn't work, it was £2k+ for a new battery pack!

If you ran out of fuel, the car would run down the HV pack next until it was so low you couldn't restart the car.

[guest9814]

The three months recommendation is not the 12V battery but the high voltage lithium ion battery pack in the back.
You do not want to ever let that go flat.

But no mention anywhere by Honda of the 12v. battery perhaps being flat after 3 months? Interesting.

Because of this they write to drive car for 30 minutes to charge battery, they mention 12v battery that get charge from DC-DC converter, HV battery not need 30 minutes to get charged, HV battery actually can by charged up to 95% without driving car within 5 minutes.But 12v battery can’t accept big current and need more time to be charged

Our 12v battery have big self discharge rate  because it’s Lead Acid battery and it’s only 35ah capacity so it discharge faster then bigger battery.
new insight have lithium ion battery  (that have low self discharge rate) that placed under gear shifter in salon.
Add to this story Honda + that like I understand can woke up car computer to get information or car can check for updates through telematics.
And things can go worse if someone hardwire camera that working when car parked !!!

[Kremmen]

Good point about dashcam parking mode although the better hardwire kits have a voltage cutoff. Not a lot of use if parking mode switches off after a few hours.

I wonder if a higher rated 12V could be fitted if needed ?

[guest9814]

Good point about dashcam parking mode although the better hardwire kits have a voltage cutoff. Not a lot of use if parking mode switches off after a few hours.

I wonder if a higher rated 12V could be fitted if needed ?

Best solution to use small additional battery like those that used by BlackView BlackVue B-112 Power Magic Battery Pack
or one from Thinkware https://us.thinkware.com/product-page/external-battery-bab-50-hardwired/
https://ca.thinkware.com/thinkware-ivolt-mini-ultimate-guide/ explanation and instalation how to
that option cost $ but the auxilary 12v car battery will not by discharged because camera hardwired to this backup battery and backup battery get energy from car 12v system only when car in ready mode.
This backup batery can by diy one with safer chemistry cells (NiMH for example - robot vacuum packs can by adopted if they 12v - 10 cells) but this pack will have bigger weight.
with DIY battery only problem to get camera sense that ignition switched off. otherwice it may not use parking mode.

[culzean]

Good point about dashcam parking mode although the better hardwire kits have a voltage cutoff. Not a lot of use if parking mode switches off after a few hours.

I wonder if a higher rated 12V could be fitted if needed ?

Best solution to use small additional battery like those that used by BlackView BlackVue B-112 Power Magic Battery Pack
or one from Thinkware https://us.thinkware.com/product-page/external-battery-bab-50-hardwired/
https://ca.thinkware.com/thinkware-ivolt-mini-ultimate-guide/ explanation and instalation how to
that option cost $ but the auxilary 12v car battery will not by discharged because camera hardwired to this backup battery and backup battery get energy from car 12v system only when car in ready mode.
This backup batery can by diy one with safer chemistry cells (NiMH for example - robot vacuum packs can by adopted if they 12v - 10 cells) but this pack will have bigger weight.
with DIY battery only problem to get camera sense that ignition switched off. otherwice it may not use parking mode.

Don't the dashcams have the normal 5volt micro or mini USB socket ?  The 12 volt power supply that plugs into car cigarette lighter  aka accessory socket just steps the 12v down to 5 volts.  I believe Jocko fitted a 10,000mA/h like this into circuit with his NextBase dashcam,  when the cigarette socket was powered up it charged the powerpack and when off the powerpack powered the dashcam, as said above the Li-Ion battery cannot backfeed into car electrics when ignition off because 12v accessory socket is isolated from car electrics.   

A dashcam will normally draw about 1.5 watts at 5 volts = about 0.030 amps,  so the 10A/h battery will last a decent time - if a dashcam has a separate supply for 'parking mode' it means that only the 'G' sensor is powered and if it gets activated the camera will begin recording for a set length of time, the power required in that mode will be very, very small... obviously it would take a while to drain a car battery,  but some power is wasted in the 12v -> 5volt power supply which would not be wasted by the 5v battery pack direct to dashcam ( if the 12volt accessory plug gets warm, that is wasted power ).

https://www.amazon.co.uk/10000mAh-Portable-Charger-Battery-compatible/dp/B09CR6JDZP/ref=sr_1_10?dchild=1&keywords=5v+battery+pack&qid=1633079129&sr=8-10

[Neil Ives]

I believe Jocko fitted a 10,000mA/h like this into circuit with his NextBase dashcam,  when the cigarette socket was powered up it charged the powerpack and when off the powerpack powered the dashcam, as said above the Li-Ion battery cannot backfeed into car electrics when ignition off because 12v accessory socket is isolated from car electrics. 

That sounds like a good system.

[guest9814]

When you doing hardwire connection of dashcam you using 12v adapter that compatible with your dashcam  this hardwire kit can tell to dashcam when to go to parking monitor mode, this adapter have dc-dc converter  inside and low voltage disconnect logic.
But some dashcams connects to 12v and have all electronics to convert voltage inside.
Yes some cameras can go in parking monitor mode without hardwire kit by using vibration sensor.
I tried option with powerbank but that not worked good with dashcam that i used (used 4k dashcam Viofo A129Pro Duo)
Avoid this dashcam it`s  bugy stopping write overheating stopping respond, sometimes with baddly assembled optic  so you have part of image out of focus !!! and also they hardware kit - they work very bad cut of voltage not ajusted  when you set 11.9v this module not dissconnected dashcam when reaching 11.9v.

[Kremmen]

Correct

There are 2 main systems :

The first system uses a 2 wire kit and just relies on no car movement for a set period to go into parking mode. This requires the kit to be wired to permanent live.

The second system has a 3 wire kit, one wire to permanent live and the other to an IGN source. Turning off the car ignition puts it into instant parking mode.

As well as here I also keep an eye on DashcamTalk and from what I read no parking mode system is without glitches.

I've got my Viofo wired via a Nextbase 2 wire kit just wired to IGN so the dashcam fires up and shuts down with IGN power. I don't need parking mode as it's garaged.

It sounds like what Jocko did was put a powerbank into the equation which is one solution but that means the dashcam is powered up 24x7 unless it's one that shuts down with no movement. If that's the case then upon movement it fires up and may be too late to capture what you need.

[embee]

I haven't read this thread in detail, but just as a note of caution, typical plug-in 12V to USB adapters take significant current even when nothing is plugged into them. Someone I know had one on a motorbike and it kept flattening the battery, I measured the no-load current at about 25-30mA (effectively drain a typical service 10Ah bike battery in around 10days so the bike won't start). Not much of a problem with a regularly used 45Ah car battery, but smaller back-up ones could be an issue.
Note just to be aware.

[culzean]

Correct

There are 2 main systems :

The first system uses a 2 wire kit and just relies on no car movement for a set period to go into parking mode. This requires the kit to be wired to permanent live.

The second system has a 3 wire kit, one wire to permanent live and the other to an IGN source. Turning off the car ignition puts it into instant parking mode.

As well as here I also keep an eye on DashcamTalk and from what I read no parking mode system is without glitches.

I've got my Viofo wired via a Nextbase 2 wire kit just wired to IGN so the dashcam fires up and shuts down with IGN power. I don't need parking mode as it's garaged.

It sounds like what Jocko did was put a powerbank into the equation which is one solution but that means the dashcam is powered up 24x7 unless it's one that shuts down with no movement. If that's the case then upon movement it fires up and may be too late to capture what you need.

IIRC Jocko said it was powered up all the time so taking video until the powerbank conked out, but if G sensor does get activated it will save the present clip ( probably 3 minutes ) to a locked file, so easier to find.   I found G sensor really sensitive on my NextBase 511GW and had to basically turn it off because I was getting too many locked files from even slight bumps in the road.  If you only use the powerbank when parked in public places and not on your own driveway it would be fine.