Advice needed about Jump start - Power bank

[spudone]

Mods, Please move if in the wrong section.

My booster Box is to big and I am looking at the small ones advertised but I am seriously confused and need some expert advice please.

I have seen a 600amp, which in the small print says it is 12000Mah (12amp)

Then I see one which is 80,000 Mah (I believe that is 80 amp)

These are reasonably cheap at around £30-35 and I definitely can't afford something over a hundred quid like some trade ones.

I would prefer however to be advised correctly before I make a mistake as I am definitely not understanding something here.

Thanks for reading

[No ideas for a name]

Can't give you much advice on what to go for, but just to explain the terminology...

You are confusing capacity in mAh or Ah with output current in Amps

For example, 8,000 mAh which is the same as 8Ah means it will supply (in theory) 8A for 1h or 16A for 30 miniutes, 32A for 15 minutes etc. before it goes flat.

600A is the instantaneous output, which with an 8Ah battery it would sustain for 0.8 of a minute (48 seconds).

The above is an over simplification - but gives you the idea.

Edit: I see you were on about 80Ah not 8Ah.... the theory is still the same, just add a zero to my estimate. e.g 480 seconds...

Edited by No ideas for a name on Thursday 30th August 19:03

[littleredrooster]

I'm fairly sure mine's a 48,000mAh and it started a 2.7 V6 diesel with a completely flat battery with no effort whatsoever. I was seriously impressed!

45 quid's worth of excellent insurance, IMO.

[anonymous-user]

What is it needed for? If you are constantly boosting a dead battery, might be time to invest in a new battery. Or disconnect it when left for long periods.

[Merry]

littleredrooster said:

I'm fairly sure mine's a 48,000mAh and it started a 2.7 V6 diesel with a completely flat battery with no effort whatsoever. I was seriously impressed!

45 quid's worth of excellent insurance, IMO.

You wouldnt happen to have a link to it would you? After something like that!

[Riley Blue]

I have a Suaoki U28 which starts my 4.2L Audi with ease; around £120 on Ebay so not the cheapest. Previously I had a cheap one which melted.

[spudone]

Thanks to everyone who have replied and for clarifying things for me.

I seem to have a drain on my bmw 318ci (which has been there since new)
Bmw dealer syntner replaced the battery I also did the same, without realising something is draining it if left for a few days.

One of these "cheaper" ones would be a bonus IF it works, This is the one I was looking at:

www.ebay.co.uk/itm/80000mAh-4-USB-Car-Jump-Starter...

Interested in hearing feedback please.

My son works on scooters and is always nicking my booster box, so it would be a great help to him as well

MDMA . said:

What is it needed for? If you are constantly boosting a dead battery, might be time to invest in a new battery. Or disconnect it when left for long periods.

[Ed.]

I have this DbPower A09
https://www.amazon.co.uk/DBPOWER-10800mAh-Emergenc...

It struggled to start a 2 litre Hyundai last winter though I can't rule out user error.
I easily started my Ktm 990 a few weeks ago after the heated grips took it down to 10 volts.
Lots of good reviews on amazon.

[vikingaero]

I have a RAV Powerbank bought from Amazon in one of their forever sales. I'm impressed with it. It jumps most cars no problem and is far better than a giant (in comparison) 10kg ones with handles. The only thing is after one boost you really should charge it.

[phillpot]

Unless battery drain is a known issue on 318's it must be fixable, try a different garage? If it's been like that from new you really should have been more persistent and got it sorted under warranty or rejected the car.

But if you want to carry on knackering battery after battery it looks like you need to budget £100+ for a decent mini jump pack?

[Penelope Stopit]

spudone said:

I seem to have a drain on my bmw 318ci (which has been there since new)
Bmw dealer syntner replaced the battery I also did the same, without realising something is draining it if left for a few days

Every time I read a comment like this I think to myself "what's gone wrong with people"

BMW are obliged to fix the problem
If BMW can't fix it they will have to replace the car

[littleredrooster]

Merry said:

littleredrooster said:

I'm fairly sure mine's a 48,000mAh and it started a 2.7 V6 diesel with a completely flat battery with no effort whatsoever. I was seriously impressed!

45 quid's worth of excellent insurance, IMO.

You wouldnt happen to have a link to it would you? After something like that!

Slip of the keyboard when I typed that! I've just checked and it's a RavPower RP-PB053 18,000mAh pack. No signs of it, or anything like it, on either Amazon or Ebay, unfortunately.

[Collectingbrass]

How old is the car? I would try and get the drain sorted if possible. I'd also make sure the battery has been coded to the car, if its the one you fitted.

How long is your normal journey, is the car getting enough time to charge the battery?

In the meantime you could try a solar power trickle charger like this, which I use in my 645 when it gets temperamental on me (when does it ever not but that's a different story).

https://smile.amazon.co.uk/AA-5060114614185-Solar-...

For a jump pack, most of the ones on Amazon list the max engine size they will deal with. Bigger is better. I don't remember which mine is but it was good for 7L as I remember and it will jump mine from flat at least 4 times before I need to charge it.

[AdeTuono]

Penelope Stopit said:

BMW are obliged to fix the problem
If BMW can't fix it they will have to replace the car

Really?

[GreenV8S]

I agree. A jump starter fixes the symptoms, not the cause. If the car was bought from a trader / dealer with this current drain problem then the seller is liable to rectify it. I can understand you wanting to have some means to jump start it while you resolve the problem, but that doesn't stop the battery being damaged every time it is deep discharged and really doesn't address the problem.

A decent auto electrician ought to be able to track current drain down quite easily.

[Penelope Stopit]

AdeTuono said:

Penelope Stopit said:

BMW are obliged to fix the problem
If BMW can't fix it they will have to replace the car

Really?

I seem to have a drain on my bmw 318ci (which has been there since new)

Yes Really

[anonymous-user]

i bought one. used it once on a flat battery, didn't work.

[AdeTuono]

Penelope Stopit said:

AdeTuono said:

Penelope Stopit said:

BMW are obliged to fix the problem
If BMW can't fix it they will have to replace the car

Really?

I seem to have a drain on my bmw 318ci (which has been there since new)

Yes Really

I doubt very much if things are as black & white as that.

[227bhp]

Thesprucegoose said:

i bought one. used it once on a flat battery, didn't work.

See last comment on similar thread down there.

[Penelope Stopit]

AdeTuono said:

Penelope Stopit said:

AdeTuono said:

Penelope Stopit said:

BMW are obliged to fix the problem
If BMW can't fix it they will have to replace the car

Really?

I seem to have a drain on my bmw 318ci (which has been there since new)

Yes Really

I doubt very much if things are as black & white as that.

I hope you aren't playing games
https://www.whatcar.com/news/your-legal-rights/