 | Home > Off Topic > Antigravity Batteries |
 
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| uncas Member Since: 22 Nov 2012 Location: Wentworth near Rotherham Posts: 340  
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Has any one tried the Antigravity Micro-start XP3 jump start kit out? I'm carrying a set of 40mm sq extra long jump leads with a 350 amp anderson connector for ease of connection (I know a bit of an overkill on cable size) which are heavy and bulky. I' just seen this kit on the www.expeditionexchange.com web site.
Uncas |
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28th Nov 2014 2:44pm |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558 
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don't know about them ones , but if your looking around at them , sealey do some small jump packs
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28th Nov 2014 2:57pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
Funnily enough I ordered one on Monday past from the bay for £103 delivered including the import charges. I carry jump leads and have a small sealey jump pack which always seems to need charging before use. IMHO at £100 it is worth the risk of at least trying especially if it starts the Puma once with a flat battery out in the sticks in the middle of the night, without having to wait on assistance. Also it states 200 Amp- 400 Peak Amp Jump Starting ability, as soon as it arrives I will be putting it too the test!!
http://www.ebay.co.uk/itm/310873441986?_tr...EBIDX%3AIT Apparently this picture contains an image of the anti gravity pack but for the life of me I can't quite make it out. 
 Click image to enlarge Admin note: this post has had its images recovered from a money grabbing photo hosting site and reinstated  |
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28th Nov 2014 5:50pm |
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| Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971 
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Pictures like that really
 me off. It would be quite useful to be able to see what it says on the box but no, the box is too small to see just so they can fit some boobs in too. I mean seriously, what do they add?
They don't say anywhere what the capacity of the battery is either. |
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28th Nov 2014 8:29pm |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558
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The battery is a 12ah
Seems rather low |
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28th Nov 2014 9:28pm |
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| uncas Member Since: 22 Nov 2012 Location: Wentworth near Rotherham Posts: 340
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Funnily enough on page 25 of the latest issue of LRO Neil Waterston has a little piece on an emergency jump pack that
Devon 4x4 are selling the price is £118.80. Uncas |
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28th Nov 2014 9:30pm |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558
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also the jump starting is marked up 10awg which is rated at 52amps also seems rather low |
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28th Nov 2014 9:37pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
I did a little bit of research on this before purchasing and I am by no means an electrical techy when it comes to battery make up and dynamics but I do know that the most common battery rating is the AMP-HOUR RATING. This is a unit of measurement for battery capacity, obtained by multiplying a current flow in amperes by the time in hours of discharge. (Example: A battery which delivers 5 amperes for 20 hours delivers 5 amperes times 20 hours, or 100 ampere-hours.) Manufacturers use different discharge periods to yield a different Amp-Hr rating for the same capacity batteries, therefore the Amp-Hr rating has little significance unless qualified by the number of hours the battery is discharged. For this reason Amp-Hour Ratings are only a general method of evaluating a battery's capacity.
Now these batteries are only 12Ah or 12,000 mah and this is handy to know if you are using the battery pack to charge laptops, phones etc as the XP-1 also does. What you need to know is basically the CCA (Cold Cranking Amperage)or its equivalent for Li-ion batteries, which is the maximum amperes that can be continuously removed from a battery for 30 seconds at 0°F before its voltage drops to unusable levels. A 550 CCA battery can supply 550 amperes for 30 seconds at 0°F. Now with modern Li-ion AA or 18650,18500,26650 etc etc sized batteries you can get a 3.7v battery with a capacity of 1000 mah which discharges up to 20 Amps, now connect 10 of those together and you can have 200 Amps of discharge at 37 volts which can be reduced to 12 -14 volts with the addition of a built in voltage regulator. Another higher Amps example is the Efest Purple 26650 3.7v 3500 mah battery that discharges 64 Amps, x10 giving a discharge of up to 640 Amps. So depending on the size. make and quantity of batteries contained within the antigravity case the amperage required to start a vehicle is readily available. JMTW 
Click image to enlarge HTH Brian. :thumbsup: Admin note: this post has had its images recovered from a money grabbing photo hosting site and reinstated |
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30th Nov 2014 5:36pm |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558
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the cable they use jump start leads has a marking of 10awg which has a rating of 52amps , but the write up states it has a jump starting abilty of 200-400amps
isn't that wire a bit lightweight for them amps stated |
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30th Nov 2014 5:54pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
If the jump leads were of a length then I would say yes the amperage would be too high for 10awg. The leads supplied are very short, about 10 inches long and some reviews I have read state that the jumper cables do get warm and you need to wait on them cooling down before retrying.
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30th Nov 2014 6:05pm |
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| Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971
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Lorryman100: you make a good point, but I think you've got your maths wrong with this bit:
10 of them in series would give you 37V at 1Ah (capacity), 20A (peak discharge). 10 of them in parallel would give your 200A peak discharge but at only 3.7V. The internet seems to reckon LiFePo4 batteries would be the best bet for high discharge rates, and 10C is definitely possible, 20C in some cases. They're actually a lower voltage, 3.2V nominal, but that could work quite nicely for a boost pack because 4 in series gives 12.8V. Sadly they're lower capacity than other battery chemistries but as you point out that isn't of primary importance here. Using information from here: http://www.candlepowerforums.com/vb/showth...;p=2609947 4 18650 cells in series to give the required voltage. 12 of those strings of 4 in parallel gives the 12Ah rating and around the 200A discharge current. Electric sums all seem to add up, though you're only going to get about 3 minutes of 200A out of them, that's plenty. The only problems is that we're now talking about 48 18650 sized batteries, and that's a lot. They're supposedly 18mm in diameter and 65mm long, and that's going to take up more space than we're trying to play with. Stepping up to 26650s would probably help, they're about double the capacity of an 18650 so we'd only need 24 of them and the diameter of them fits in well with the size of the cigarette light socket on the pack. Arranged in a grid of 4 rows of 6 batteries that's 156mm wide, 260mm long, 26mm thick ignoring all the electronics, interconnects etc etc. You know what, this might actually work! Edit: just found the dimensions listed on their website. The 12Ah XP-1 is 6" x 2.8" x 1" and weighs 14 ounces. |
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30th Nov 2014 10:18pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
The point is what I was going for.  |
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30th Nov 2014 10:37pm |
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| Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971
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Neither am I, just an interested and often skeptical electronic engineer
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2nd Dec 2014 8:04am |
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| Ragerover Member Since: 26 Dec 2013 Location: In a land far far away Posts: 145
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Saw these at Silverstone this year.
worked great on a petrol 5 ltr car. checked out the gumf they only guarantee u to 2.2 ltr diesel the battery's are mad also bought a bike one weighed less than a can of coke and about the size of 2 fag packets. you get a free charger too. I know there not the best when they go flat think it F`s them and cant be recharged |
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2nd Dec 2014 6:27pm |
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