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battery jump pack

Halford
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20 Feb 2015 14:28 - 20 Feb 2015 16:16 #138583 by Halford

Replied by Halford on topic battery jump pack

Have you tried it out yet jonathan ?

does seam almost too good to be true, need to alleviate peoples scepticism

need to make a video jumping the jimny .... don't use that title though :pinch:

the ex Dog-Taxi

Last edit: 20 Feb 2015 16:16 by Halford.

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Rhinoman
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20 Feb 2015 15:26 #138589 by Rhinoman

Replied by Rhinoman on topic battery jump pack

Halford wrote: Have you tried it out yet jonathan ?

I think you should leave your headlights on overnight and then try it in the morning - video evidence is essential.

Is that a fuse in the positive lead? what rating is it?

Some Suzukis and a bunch of motorcycles.

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Rhinoman
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20 Feb 2015 15:32 #138591 by Rhinoman

Replied by Rhinoman on topic battery jump pack

Halford wrote: only ￡35.82 delivered
but don't take paypal and feel a bit wary giving thm my credit card details :blink:

I've been using Aliexpress and its trade 'brother' Alibaba.com for years without any issues, its a Chinese site but listed on the NYSE. I did note the price, £35 for a 30Ah Polymer battery seems a bargain although with Chinese stuff its usually the chargers that you have to be wary of, not just because they can burn your house down but they tend to be very crude and kill the batteries relatively quickly.

Some Suzukis and a bunch of motorcycles.

The following user(s) said Thank You: Halford

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jonathan
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20 Feb 2015 17:01 #138597 by jonathan

Replied by jonathan on topic battery jump pack

well i got to use it this afternoon on a customers car and it started it it was a vw polo 1.4 petrol i when to do a service on it and it had a flat battery , i have no problems with aliexpress with payment , i buy a lot of stuff from there my hood ornament the satnav stereo and other things

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TomDK
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20 Feb 2015 18:23 #138601 by TomDK

Replied by TomDK on topic battery jump pack

Busta wrote: It says the output power at 12v is 2 amps. A small car battery output is about 60 amps and a starter motor will draw close to that. So unless the idea is that you leave it for a couple of hours to charge the car battery up, I can't see how it will ever work?

ETA
Just seen, further down the page it says 250 amps at 12v! Which is very impressive, but far higher than those jump leads would ever take, let alone any wiring within.

Also it can apparently start your car 20 times but only power the LED light for 40hrs (I have a single AAA powered headtorch that lasts that long) and can only charge a phone 10 times? That seems odd.

I can see it helping if your car battery is tired and just needs a bit more oomph on a cold morning, but that is a good sign that your car needs a new battery, which will cost about the same as this! When a car battery is flat (e.g. left the lights on) then there is no way this will help. They even say it only works above 20% charged.

So, unless like in Biasmechanic's example you have lots of cars with tired batteries you don't want to replace, I'm a bit sceptical of it's worth.

Those leads are fine for short time use of small engines. They're only 10-15 cm long so only gives little resistance compared to normal battery cables that are often quite long. They look like around 25 mm2, fine for giving a few seconds of boost.

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helijohn
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20 Feb 2015 19:46 #138615 by helijohn

Replied by helijohn on topic battery jump pack

I use LiPos in my RC stuff and they can certainly pack a lot of punch and they charge fairly quickly.

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battery jump pack

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