doctorow — 2014-04-25T15:01:03-04:00 — #1
djhopscotch — 2014-04-25T15:12:45-04:00 — #2
Several similar devices are currently on the market, why hype this one?
robcruickshank — 2014-04-25T15:31:41-04:00 — #3
Anything that can source 300 Amps ain't goin' in no pocket of mine.
stephen_schenck — 2014-04-25T15:40:55-04:00 — #4
But if it's USB-based, wouldn't it output five volts, not twelve, regardless of the amperage?
jim_kirk — 2014-04-25T15:48:09-04:00 — #5
Looks like it has a switch mode power supply to generate USB plus the raw battery output for car jumping.
jim_kirk — 2014-04-25T15:54:53-04:00 — #6
This looks like a pretty good deal, actually. I might get one for my quad-copter. If it's really 6000 mA and weighs 7 ounces, that's very good compared to this Tenergy 5000 mA-h pack that weighs almost twice as much and is about 10% greater volume.
tribune — 2014-04-25T16:07:03-04:00 — #7
The Heidelberg Electric Belt was invented during the late 19th century fad for electrical cures. Sold as an invigorating electric belt, it had the option of a ‘sensory appliance’ which converted it into an invigorating electric jockstrap...
ed_beaty — 2014-04-25T16:09:41-04:00 — #8
jim_kirk — 2014-04-25T16:17:03-04:00 — #9
This guy makes dangerous engineering FUN!
jandrese — 2014-04-25T16:23:58-04:00 — #10
Yeah, I wonder how hot the arc will be when a coin bridges the terminals on that?
robcruickshank — 2014-04-25T16:50:32-04:00 — #11
kyle_c — 2014-04-25T17:06:40-04:00 — #12
The cable with the jumper clips is removable, so I think the idea is you just keep that part in your car not your pocket!
seyo — 2014-04-25T17:21:14-04:00 — #13
I have the powerall, which I found out about on this site I think. It can jumpstart at 12v up to 400 amps. Also has USB, cigarette lighter style and various DC connectors. And a flashlight.
morcheeba — 2014-04-25T17:21:54-04:00 — #14
6000mAH isn't a measure of total energy, though -- for that you'd need to multiply by the voltage. I suspect that they haven't found a cheap half-weight battery, but that they are basing this rating on 3.6v or 5v instead of 11.1v of your Tenergy pack. That math works out - that's a little less than half the energy of your pack.
michael_r_smith — 2014-04-25T17:54:38-04:00 — #15
Any nickel cadmium battery will do that. Back in my teenage years we used them in our model aircraft and we used to say you could start a car with them. My friend had a pack of NiCd batteries melt through the bottom of his back pack.
crenquis — 2014-04-25T18:02:32-04:00 — #16
Does it come with nipple clamps? Just asking for a friend.
morcheeba — 2014-04-25T18:16:12-04:00 — #17
What's cool is that the fuse is on that removable jumper clip ... so if you need to do some emergency cauterizing, just skip the wires and stick a paperclip in there!
thaumatechnicia — 2014-04-25T18:17:40-04:00 — #18
Can I be the first one to say: "Uh, no..."?
Fer, ahem, starters, if that little battery pack is good enough, that battery isn't really dead or, more importantly around here, frozen.
I'd like to see it try to start a car in Win(ter)nipeg, with the crankcase oil more the consistency of crankcase molasses. Yeah.
bytebro — 2014-04-25T19:46:12-04:00 — #19
I was just about to say that surely it would probably go bang as soon as you made that sort of current demand on it, but I think you answered my query - thanks!
jim_kirk — 2014-04-25T19:47:34-04:00 — #20
Yeah, they don't really spec it too well, watt-hours are much better. If the cells are around 2700 mA-h (I'm assuming three series cells losslessly converted to 5V), then sourcing 300 amps would be over a 100C rate, which is pretty scary unless they're using some of the new chemistries with nano-tube or some such high-tech.
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