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Old 11-16-2012, 10:46 AM   #46
_cy_
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[QUOTE=BeachMoto;20052977]
Quote:
Originally Posted by ragtoplvr View Post

Here you go.

what a killer idea!!!
since I've got a kick starter, this could bail someone else out.
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Old 11-16-2012, 01:55 PM   #47
Grinnin
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Originally Posted by StuartV View Post
Isn't that point kind of moot? The idea that that little battery pack could deliver 20 amps (let alone 40) is a bit of a fantasy, don't you think?
Not at all. The instantaneous power is not necessarily related to the total energy available.

Lead-acid is out, but some lithium batteries can deliver amperage at rates over 30c (thirty times the capacity) which would be 39A for the 1.3Ah battery. For 20A we are asking only for 16c which is pretty common.

It depends on what the battery was designed to do. A physically large battery can more easily deliver higher instantaneous power, but that is not the only way.
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Old 11-16-2012, 07:26 PM   #48
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Originally Posted by Grinnin View Post
Not at all. The instantaneous power is not necessarily related to the total energy available.

Lead-acid is out, but some lithium batteries can deliver amperage at rates over 30c (thirty times the capacity) which would be 39A for the 1.3Ah battery. For 20A we are asking only for 16c which is pretty common.

It depends on what the battery was designed to do. A physically large battery can more easily deliver higher instantaneous power, but that is not the only way.
I was really looking at the wires coming out of it as much as the battery pack itself....
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Old 11-16-2012, 09:21 PM   #49
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Target has a few small self jump start devices. Plug into lighter socket, turn on wait a few minutes. Start car and leave plugged in to recharge pack.
http://www.target.com/p/wagan-self-c...ot=medium_5_10

Somewhere I saw an article where someone had wired in a 14.5 volt dewalt socket from a broken drill. They carried the fully charged dewalt battery as a back up. Sound like a great idea to me.
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Old 11-17-2012, 04:24 AM   #50
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Originally Posted by StuartV View Post
I was really looking at the wires coming out of it as much as the battery pack itself....
You are absolutely right that those wires won't handle these (theoretical) loads. The cig lighter plug is a killer too. When they added a flashlight it looks more like a toy.

I wanted to look at the math of what a 1.3Ah battery can deliver if done right. I was prompted by your phone battery which is optimized to deliver at c/20 or slower (the 20-hour rate). Other batteries are optimized for 20c and faster.

PERSONALLY I don't and wouldn't carry a spare battery; I DO check electrolyte before trips and have volt meters on my bikes to watch for problems. If I forget my headlight some night (wouldn't I see it?) I'd have to figure out my options from there.
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Old 11-17-2012, 05:02 AM   #51
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Originally Posted by StuartV View Post
But have you actually used it to start your bike when the battery was really dead? It has a 1.3Ah battery, which sure doesn't seem like much to turn over a dead fuel-injected GS.

Yes, Tested prior to my last trip, left the ignition on with all the lights etc. ran the battery completely flat, not even a clicking from the starter relay. I made an adaptor to plug the cigarette plug into the gerbing lead which is connected onto the battery, left for 20 mins and she fired up straight away with no hesitation. 1400 cc fuel injected lump. Also tested it on the car , plugged straight into the cigarette lighter socket. Same result. But I would agree with one poster, make sure you have a decent battery to start with!!




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Old 11-17-2012, 06:38 AM   #52
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Originally Posted by PFFOG View Post
Think??? no it is a joke, there is no way that thing will do crap, it might run the instrument lights for 5 seconds.
It is NOT a joke, they CAN work.

If you leave the key on and run the battery low. Then at home you connect a 1 amp charger to the battery for an hour, the bike could easily start from that. WOW, the 1 amp charger is magical.

These are NOT high current jumper cables. They are battery rechargers. They put some charge back into the bike/car battery just like a slow charger at home, and you can then start from the main battery. They CAN work.

What I see as the main drawback to this model is that it is NiMh. The batteries would need charged at least once a month. A hassle.
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Old 11-17-2012, 07:16 AM   #53
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Originally Posted by worwig View Post
It is NOT a joke, that CAN work.

If you leave the key on and run the battery low. Then at home you connect a 1 amp charger to the battery for an hour, the bike could easily start from that. WOW, the 1 amp charger is magical.

These are NOT high current jumper cables. They are battery rechargers. They put some charge back into the bike/car battery just like a slow charger at home, and you can then start from the main battery. They CAN work.

What I see as the main drawback to this model is that it is NiMh. The batteries would need charged at least once a month. A hassle.
Just for info. Tis was fully charged 3 months ago before I used it. Didn't recharge it first. Was fine. Only takes a couple of hours to charge from the mains. Charges fully on a long ride (200+ miles) from the bike . Works for me... :)


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Old 11-17-2012, 08:02 AM   #54
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Thanks for the info, AMS!
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Old 11-17-2012, 09:06 AM   #55
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I have a device called Mighty Jump from Viatek products that I bought at the motorcycle show at the Javits Center in NYC earlier this year and it works great. I have a pigtail wired directly to my battery with a quick-connect at the end. I plug a female cigarette lighter attachment I to that and the might jump comes with a wire to connect to that. Leave in plugged in for 5-10 mins, fire up the bike, flip the switch so the bike re-charges the Mighty Jump and you are good to go. That being said I recently got an Antigravity lithium main battery for my bike and at 4.25" X 2.25" X 3.25" a spare lithium battery is very portable and the rate of discharge per month is very low; something like 1% a month. It's true lithium doesn't like the cold but you can warm the battery against your body or whatever.
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Old 11-17-2012, 06:33 PM   #56
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I have a TXC449, TE630, a quad and a sled that are electric start only so I made this up out of crap I already had in the garage:



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Old 11-18-2012, 01:51 AM   #57
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Twin batteries baby!!!!

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Old 11-19-2012, 12:26 AM   #58
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For traveling in a group, a set of jumper leads. For traveling alone I'd considered carrying a LiFe battery as a backup - low weight and low discharge with the aded bonus of being able to replace a dud battery as well. For a KTM 990, roll starting is not an option! (unless you have nice big hill very close by).
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