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#4538472 - 10/09/17 08:21 PM What Battery charger for this need?
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
So I have a new Blackvue 750s 2 channel dash cam in my vehicle. (Horrible drivers where I am, long story). Anyway it's wired to record when it's parked as well and it will do so until the battery voltage drops to a certain point and then shut-down leaving enough reserve to start the vehicle.

Anyway, I thought it would have enough power to record all night long but it seems that the battery I have in my vehicle just doesn't have enough lasting power to do so. (Even though it's brand new).

So I was thinking of getting an automatic trickle charger and modifying it with a quick/disconnect connector as needed and then just plug in the vehicle when I get home. (Plug is like 2ft from where the vehicle front end is).

What would be your thoughts on keeping the battery topped up and the dashcam running? 2 amp enough?

Thanks all!


Edited by StevieC (10/09/17 08:26 PM)
_________________________
'15 Dodge Journey - 90,000 KM's - SSO 5w20
'06 Hyundai Santa Fe - 535,000km - SSO 0w30 (R.I.P)

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#4538485 - 10/09/17 08:33 PM Re: What Battery charger for this need? [Re: StevieC]
eljefino Offline


Registered: 06/15/03
Posts: 32628
Loc: ME
2 amp should be plenty. But your battery is either rubbish or the camera falsely shuts off.

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#4538488 - 10/09/17 08:34 PM Re: What Battery charger for this need? [Re: StevieC]
gathermewool Offline


Registered: 01/09/09
Posts: 5986
So, you let the cam shut off on low voltage and then the only recharging your battery gets is via your alternator? What is the cut-off point - what is your battery voltage before you start the car? 12.6, 12.4, 12.2VDC?

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#4538491 - 10/09/17 08:38 PM Re: What Battery charger for this need? [Re: StevieC]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
When I shut the vehicle off the battery voltage is usually 12.4. When I go to start up in the morning some 10 or so hours later the battery voltage is 12.0. (I have to monitors in the truck and both read within .1v of each other)

They do sell an external battery pack for this camera to run it all night but it's pricey so I was hoping to get away with a charger instead and keep the battery topped off and warm in the winter time as well. (2 birds with one stone sort of thing)

It draws approximately 1 amp while it's running.


Edited by StevieC (10/09/17 08:42 PM)
_________________________
'15 Dodge Journey - 90,000 KM's - SSO 5w20
'06 Hyundai Santa Fe - 535,000km - SSO 0w30 (R.I.P)

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#4538493 - 10/09/17 08:42 PM Re: What Battery charger for this need? [Re: StevieC]
eljefino Offline


Registered: 06/15/03
Posts: 32628
Loc: ME
Your battery shut off voltage should be near 13 with the surface charge then it should dip to 12.6 or so at room temps. Something's screwy, louie.

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#4538498 - 10/09/17 08:45 PM Re: What Battery charger for this need? [Re: StevieC]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Sorry I was giving you stable voltage. It is higher but then settles at those described above.
_________________________
'15 Dodge Journey - 90,000 KM's - SSO 5w20
'06 Hyundai Santa Fe - 535,000km - SSO 0w30 (R.I.P)

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#4538507 - 10/09/17 08:52 PM Re: What Battery charger for this need? [Re: StevieC]
bubbatime Offline


Registered: 03/18/08
Posts: 5619
Loc: South Florida
Yes a trickle charger is ideal for this application.
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#4538509 - 10/09/17 08:53 PM Re: What Battery charger for this need? [Re: bubbatime]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Originally Posted By: bubbatime
Yes a trickle charger is ideal for this application.


2amp you figure?
_________________________
'15 Dodge Journey - 90,000 KM's - SSO 5w20
'06 Hyundai Santa Fe - 535,000km - SSO 0w30 (R.I.P)

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#4538517 - 10/09/17 09:03 PM Re: What Battery charger for this need? [Re: StevieC]
JHZR2 Offline



Registered: 12/14/02
Posts: 41758
Loc: New Jersey
Originally Posted By: StevieC
When I shut the vehicle off the battery voltage is usually 12.4. When I go to start up in the morning some 10 or so hours later the battery voltage is 12.0. (I have to monitors in the truck and both read within .1v of each other)

They do sell an external battery pack for this camera to run it all night but it's pricey so I was hoping to get away with a charger instead and keep the battery topped off and warm in the winter time as well. (2 birds with one stone sort of thing)

It draws approximately 1 amp while it's running.


This is your clue. 100% charge on a battery is 12.65-12.7V. 12.4V is maybe 70% charged, 12.0 is maybe 15%.

Figure out why your vehicle isn't charging the battery fully first.

Also put an ammeter in series and determine what the cam is drawing. You ought to meet that need with a charger, or a bit more. Some chargers will throw a fault for too much parasitic draw, so you'll need to try a few. You don't want something so dumb that it doesn't recognize the load and cooks your battery in time.

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#4538520 - 10/09/17 09:06 PM Re: What Battery charger for this need? [Re: StevieC]
Chris142 Offline


Registered: 06/05/03
Posts: 16811
Loc: Deplorable in apple valley, ca
A fully automatic charger will only charge whats needed. So an 8a automatic charger will only put out 3a if thats all it needs.
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#4538524 - 10/09/17 09:13 PM Re: What Battery charger for this need? [Re: JHZR2]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Originally Posted By: JHZR2

This is your clue. 100% charge on a battery is 12.65-12.7V. 12.4V is maybe 70% charged, 12.0 is maybe 15%.

Figure out why your vehicle isn't charging the battery fully first.

Also put an ammeter in series and determine what the cam is drawing. You ought to meet that need with a charger, or a bit more. Some chargers will throw a fault for too much parasitic draw, so you'll need to try a few. You don't want something so dumb that it doesn't recognize the load and cooks your battery in time.


When running it's charging at 14.3v so the charging system is fine, and it was load tested by the dealer when it went in for a recall and I had the battery replaced there because it's in the wheel well and forget changing that nonsense myself. Can't be bothered but the battery was toast.

Anyway according to my loading battery tester I ran on it afterward it's fully charged when shutdown and snaps back to proper voltage after a load test is applied.

I really think it's just the parasitic draw from all the junk in the car already plus this camera that it puts up with for about 8-10 hours and then shuts down when I unlock the doors because it's enough to push it over the edge at that point.

I will try a 2amp automatic charger plugged in when I first get home until the next day and see if that does it. If not I will step it up.

I appreciate everyones input. Cheers2
_________________________
'15 Dodge Journey - 90,000 KM's - SSO 5w20
'06 Hyundai Santa Fe - 535,000km - SSO 0w30 (R.I.P)

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#4538547 - 10/09/17 09:54 PM Re: What Battery charger for this need? [Re: StevieC]
gathermewool Offline


Registered: 01/09/09
Posts: 5986
Buy the external battery pack.

Are you at least using a deep cycle battery? I can’t imagine a starter battery lasting very long under those conditions, even if you charge it every night

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#4538548 - 10/09/17 09:55 PM Re: What Battery charger for this need? [Re: StevieC]
gathermewool Offline


Registered: 01/09/09
Posts: 5986
Buy the external battery pack.

Are you at least using a deep cycle battery? I can’t imagine a starter battery lasting very long under those conditions, even if you charge it every night

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#4538572 - 10/09/17 10:33 PM Re: What Battery charger for this need? [Re: StevieC]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
No it's using the vehicle battery at the moment but it doesn't allow it to drop below 12v. I think with an automatic charger capable of keeping the battery topped up and the parasitic draw from the Dash Cam it should be ok.
_________________________
'15 Dodge Journey - 90,000 KM's - SSO 5w20
'06 Hyundai Santa Fe - 535,000km - SSO 0w30 (R.I.P)

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#4538606 - 10/09/17 11:30 PM Re: What Battery charger for this need? [Re: StevieC]
rubberchicken Offline


Registered: 07/07/08
Posts: 399
Loc: Maryland USA
The best trickle charger is the genuine " Battery Tender ". I prefer the 1.25 amp version, commonly available for around $50. I believe it comes with one quick disconnect harness, and you can buy all sorts of adapters as well.

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