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Topic # 242170 14-Oct-2018 18:45
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https://cdlnz.com/PATROL-PRO

 

This gadget is touted as being able to jump-start your car and inflate flat tires.

 

If it actually works it could be a handy kit.

 

Anyone?


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  Reply # 2107728 14-Oct-2018 19:04
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We have one of those tiny jump start packs sitting in the partner's car (Mazda 3). Came in handy once when the lights got left on and had no trouble starting the car. So don't see why this unit wouldn't be able to do the same.

 

Far more convenient than the old massive jump starter boxes - although probably can't repeat the task more than a few times.


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  Reply # 2107833 14-Oct-2018 23:10
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I would assume it might be able to jump start a 1.6L engine or smaller - battery capacity isnt very much. 

 

I use a 11,000mah to jump start my 2L diesel

 

https://www.jaycar.co.nz/450a-li-po-jump-starter-powerbank/p/MB3757 

 

One tip with these lithium battery packs is you need to disconnect the car battery, as the car battery will absorb the output of the jumper battery if you connect them in parallel. 

 

So the best way I have found is to
1) Connect clamp on to the positive terminal as per normal
2) Disconnect the negative terminal, connect the negative clamp to an unpainted metal surface nearby in the engine bay
3) Dtart the car
4) Reconnect the negative terminal
5) Disconnect the postive and negative clamps 

 

 





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  Reply # 2107883 15-Oct-2018 02:31
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They work great to get enough power into the flat 12v battery to get it to crank and start. There is only a few amphours difference between no power at all in a lead acid and having enough to crank the engine over.

 

The one I had the use of had an annoying thing where the output would only activate for a minuite or so then turn off, that wasnt enough to transfer enough power into the 12v lead acid battery, and there wasnt enough to crank the car without that being done. Restarting it a few times and giving it its minuite each time had it starting up fine from low enough that the interior light of the car was a barely visiable orange glow.





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  Reply # 2107894 15-Oct-2018 06:59
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raytaylor:

 

One tip with these lithium battery packs is you need to disconnect the car battery, as the car battery will absorb the output of the jumper battery if you connect them in parallel. 

 

 

If this gadget is only 12V (i.e. less than 13.6V) then it won't charge a 12V battery, so no energy will go into the car battery.

 

 

 

 


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  Reply # 2107904 15-Oct-2018 07:56
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frankv:

raytaylor:


One tip with these lithium battery packs is you need to disconnect the car battery, as the car battery will absorb the output of the jumper battery if you connect them in parallel. 



If this gadget is only 12V (i.e. less than 13.6V) then it won't charge a 12V battery, so no energy will go into the car battery.


 


 





To be fair - if the car voltage is at 13.6v, the engine is already running.

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  Reply # 2107920 15-Oct-2018 08:34
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I always would be wary of jump start kits like said. Also the compressor would most likely be very slow but none the less it may get you out of a sticky situation.

Also funny story... A mate has a buggered battery so he uses one of those jump starter mini packs and has it permanently attached to his battery. His car still hasn't caught on fire. Do I say something? 





 


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  Reply # 2108568 16-Oct-2018 00:36
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raytaylor:

I would assume it might be able to jump start a 1.6L engine or smaller - battery capacity isnt very much. 


I use a 11,000mah to jump start my 2L diesel


https://www.jaycar.co.nz/450a-li-po-jump-starter-powerbank/p/MB3757 


One tip with these lithium battery packs is you need to disconnect the car battery, as the car battery will absorb the output of the jumper battery if you connect them in parallel. 


So the best way I have found is to
1) Connect clamp on to the positive terminal as per normal
2) Disconnect the negative terminal, connect the negative clamp to an unpainted metal surface nearby in the engine bay
3) Dtart the car
4) Reconnect the negative terminal
5) Disconnect the postive and negative clamps 


 



@raytaylor Be extremely careful doing what you propose. As on some cars, if you disconnect the battery while the engine is running. The alternator will go open loop, and output 30+V. Which will quickly destroy all of the electronics. And on some other cars, the engine will simply stop. And there may no longer be enough charge left in the jumper pack to restart it.

I did a related trick once to jumpstart a friend's 24V Nissan Safari from my 12V Corolla. I had previously installed an external voltage regulator and external main rectifier into the Corolla. As the originals failed and it was cheaper to just make new ones.

Used the jumper cables to link the battery negative terminals on both cars. Temporarily removed the rectifier main output fuse on the Corolla. Then used the other jumper cable to connect the rectifier output on the Corolla to the battery positive on the Safari. Started the Corolla and let it idle.

Only took approx 10min to charge the Safari enough to take it from completely dead to started first pop. The alternator, rectifier, and various cables got quite warm though. Had a steady 26V across the battery in the Safari while it was charging. It would have been more, but it was absorbing lots of current. Estimated 20-30A charge current.

I don't recommend trying the above unless you know exactly how the wiring is designed in your car.





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  Reply # 2108596 16-Oct-2018 07:13
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Ge0rge:
frankv:

 

raytaylor:

 

One tip with these lithium battery packs is you need to disconnect the car battery, as the car battery will absorb the output of the jumper battery if you connect them in parallel. 

 

 

If this gadget is only 12V (i.e. less than 13.6V) then it won't charge a 12V battery, so no energy will go into the car battery.

 



To be fair - if the car voltage is at 13.6v, the engine is already running.

 

I'm not sure what you're trying to say here. Obviously if the car isn't running and the battery is too flat to start it, the battery voltage will be less than 12V.

 

If the gadget outputs 12V, then the current will all go to the starter motor and none will go to the battery, even if the car battery voltage is below 12V. Once the car starts, the alternator will output 14.4V.

 

Even if the gadget voltage is above 13.6V, only a small fraction of the current (1% or less?) would go to charging the battery.

 

It's not worth the hassle (and risk, as pointed out by someone else) of disconnecting the car battery.

 

 


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  Reply # 2108597 16-Oct-2018 07:16
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frankv:

 

Ge0rge:
frankv:

 

raytaylor:

 

One tip with these lithium battery packs is you need to disconnect the car battery, as the car battery will absorb the output of the jumper battery if you connect them in parallel. 

 

 

If this gadget is only 12V (i.e. less than 13.6V) then it won't charge a 12V battery, so no energy will go into the car battery.

 



To be fair - if the car voltage is at 13.6v, the engine is already running.

 

I'm not sure what you're trying to say here. Obviously if the car isn't running and the battery is too flat to start it, the battery voltage will be less than 12V.

 

If the gadget outputs 12V, then the current will all go to the starter motor and none will go to the battery, even if the car battery voltage is below 12V. Once the car starts, the alternator will output 14.4V.

 

Even if the gadget voltage is above 13.6V, only a small fraction of the current (1% or less?) would go to charging the battery.

 

It's not worth the hassle (and risk, as pointed out by someone else) of disconnecting the car battery.

 

 

 

 

 

 

Unless the car is fueled by a carburetor and older than most here then don't do the battery hotswap...





 


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