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.

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 

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.

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.

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.

 

 

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? 

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 

 

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.

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...