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Jump-Start Power Pack


need4speed

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Have been looking to get 1 of these before Winter approaches and thought I'd start putting some feelers out for opinions..

http://www.flatdoguk.com/xs%2Dpowerpack%2Dmulti%2Dfunction%2Djump%2Dstarter%7E1534

A little concerned about the "Britpart" name associated with it. But then surely Britpart don't manufacture stuff like that themselves?

Anyone had any experience, or have found a better one?

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Robbie (who seems to know his stuff) over on disco3.co.uk did a comprehensive test on a similar thing (http://www.disco3.co.uk/forum/topic122708.html?highlight=jump+pack) and seemed to think it was OK.

I previously had a Halfords charger/power pack which never managed to hold charge long enough to be useful. I guess all batteries have a lifespan. Thrown the thing away now and thinking of a replacement. I'd be interested to hear which way you go in the end.

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Dont see these or any such like being much cop , for a start you never see AA etc using them , they might do if your battery is only slightly down , if they could store much in them why have we got great big black cubes as batteries in the vehicle . JMHO

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For sure the Recovery guys use them, even here in winter at -20 they work a treat.....

There are a few caveats

First you need to be using them a lot to keep the cells charged. No use leaving it in the truck for a year and then expecting it to work.

Second, keep it in the cab so it's not cold when you store / charge it.

Third, they are for starting vehicles that work but have a flat battery. No use trying to start an old dog that hardly starts anyway.

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Going back to the original question, of course Britpart do not manufacture them, they do not manufacture anything. Everything Britpart sells is made by the cheapest possible supplier - which is why their quality can be a little unpredictable. ...OK, usually predictable. ;)

It was me that asked about these earlier in the year, I found it hard to believe that such a small thing could start a car. I remain constantly astonished by technology.

Chris

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These are made up of lots of low voltage cells in series - the (faulty) one I have here in bits is 24 x 1.5v AA sized Li-ion batteries in series. Whilst the cells are unmarked they are most likely 1 or 2 A/H so thats something like 24 to 48 A/H in a pack 3 inches square. A similar capacity SLA battery would be a little bigger than a golf cart battery.

The risk is that some on the market have no way of limiting the terminal voltage - if the regulator in this one failed then the terminal volts would be more than 30 volts. This would only be limited by the device its charging. Realistically if the car battery is in good health it will clamp it to about 14v until the cell pack is about flat but should the battery be disconnected or faulty your ecu or your radio may not be happy.

This one bought by a friend from e-bay is quite poor quality - I've never heard of a problem with the better ones. Whether the britpart ones are any better than their oil seals is anyone’s guess.

(edit) the above mentioned golf cart battery is of course 13.8V and is a safer bet

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The one that was tested in Inigo's link above seemed to be very good quality indeed. Appeared to be made for the Russian market and had very high quality clips and the cable was very flexible down to low temperatures.

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These are made up of lots of low voltage cells in series - the (faulty) one I have here in bits is 24 x 1.5v AA sized Li-ion batteries in series. Whilst the cells are unmarked they are most likely 1 or 2 A/H so thats something like 24 to 48 A/H in a pack 3 inches square. A similar capacity SLA battery would be a little bigger than a golf cart battery.

Your understanding of the capacity of a series connected stack of cells is incorrect. 10 x 1.5V 2Ah cells connected in series make a 15V 2Ah battery, not a 15V 20Ah battery.

Watt hours (current x voltage x time) is a better measurement for capacity when comparing differing battery technologies.

Here is the earlier thread.

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Your understanding of the capacity of a series connected stack of cells is incorrect. 10 x 1.5V 2Ah cells connected in series make a 15V 2Ah battery, not a 15V 20Ah battery.

Watt hours (current x voltage x time) is a better measurement for capacity when comparing differing battery technologies.

Here is the earlier thread.

No my understanding is fine and I've no idea what I was thinking when typing that part of the post.

Apologies for the incorrect information - it wasnt meant to mislead.

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