Jump starting

[Freddyfruitba...]

Having successfully jump-started cars with flat batteries for about 30 or 40 years (although not continuously) I've just discovered that the Proper Way is to connect up the vehicles, fire up the donor car and wait for it to charge the flat battery for long enough to provide enough juice to let it start the car on its own.

Me, I've always just connected them up, started the dead car immediately by effectively using the donor car's battery, and then having driven the dead car for a while to charge the flat battery, job's a good 'un. It's always worked fine - what's the evident problem with doing it that way?
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[MikeKP61]

Nothing really wrong with it if it works? If the donor car was running the alternator would be supplying the voltage and current in addition to the battery so you might have a better chance of starting it. Also repeatedly starting the dead car off the donors battery without it running it might eventually drain the donor battery if the fault persists making two dead cars

[MCN]

Never heard of having to wait for donor vehicle to charge a battery
Start the donor.
Connect the batteries
Have someone (or a stick if you have no friends) hold the throttle open a little so the alternator is at full output.
If the flat battery is pancake flat then it probably will need a few minutes of charge so it has enough power to carry the ignition, any fuel system load and the excitation of the alternator.

Then start the dead engine.

If it dies when you remove the leads then the battery will need a longer charge. Or it is totally FUBAR.

A volt meter helps with all of it.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[Pete.]

With my jump leads: connect the leads and crank it up.

With Halford Jump leads: connect the leads and wait for the battery to charge a bit or watch the leads melt.

If the leads can handle the amps have at it. Helps to put those leads on the engine and starter feed rather than on the battery, if you can.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[MCN]

[stinkwheel]

You have to be really careful jump starting a car these days.

I would always read the manual. My brother fried the ECU on his wifes pugeot (to his great cost and earache) by doing as described by the OP and MCN. Among other things, it turns out it has a specific jump starting post you're supposed to connect to and absolutely not the battery positive. You can jump it but there are some really specific instructions for doing so.

For reasons I'm not going to get into an argument about again withing a couple of months, if I was starting a bike from a car, I would do it with the car engine off. If a car battery can't crank and start a bike then have charge left to start the car, there was something wrong with it anyway. Others can do whatever the hell they want and shouldn't come crying to me if their reg/rec cooks.

Those little jump starter battery packs are black magic. I thought they were a gimmick until I saw someone fire up a transit van with one three times on one charge at a music festival.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[cb1rocket]

[MCN]

[Polarbear]

I've just connected leads between batteries and never worried about it. It's worked every time for me and personally I can't see a problem. Paralleling a battery is just providing a bigger electric 'sink'. Same voltage, same resistance just more amps available.

I would't argue with any of Stinkwheels points but then I wouldn't be too bothered about implementing them either as I've never had any problems in 40 years of motoring doing it like that.

You do what you are happy doing.
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Triumph Trophy Launch Edition

[grr666]

I had a van which I sold but not long before selling it had £80 worth of new battery. I still had the old one so
I swapped them over and kept the good un when I sold the van on. So I use that for jumping. 770cca is enough
to start a diesel so it makes light work of starting a bike via some jumper cables. The scoot was as dead as a doornail last
year when I wheeled it out of hibernation, my spare battery started it up no problem and an hours ride was enough to
charge up the one on the scoot.
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Ste wrote: Avatars are fine, it's signatures that need turning off.

[MarJay]

My Dad's old Renault 18 did two alternators from Jump starting, so I'd imagine you have to be careful not to melt it by trying to charge two batteries.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[MCN]

[stinkwheel]

[Monkeywrenche...]

[grr666]

[G]

[MCN]

[MCN]

[grr666]

I buy all my batteries from Tayna. Just looking to change the one in the van for one with a bit more in the tank ,
so to speak as I want to set up an electric heater in the back to keep the doggo warm after walkies. She's usually
soaking wet and short haired. I can't watch her shiver the poor sod, so I'm looking into making the back warmer
for her, but it needs to be instant heat so electric. Also be handy for defrosting. That said Tayna are much dearer than
you paid at Padgetts.

https://www.tayna.co.uk/motorcycle-batteries/yuasa/ytz10s/
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Currently enjoying products from Ford, Mazda and Yamaha
Ste wrote: Avatars are fine, it's signatures that need turning off.

[G]

[MCN]

[grr666]

Pet mat may work, I've just spent 60 quid on a large 4 inch thick pvc coated cushion for her to lay on and
to insulate against the floor though. It's just that the van doesn't really warm up at all between here and the forest
we use, being semi rural here I don't have to go far to find lovely countryside, but she definitely has more doggo
fun in the forest which is only 8 minutes away, by the time we return to the van, what little heat had built up on the way
there has gone again. She has got a coat, and a habit of jumping in the river with it on rendering it useless.
I was thinking something like this might be okay? Certainly cheap enough to take a punt.

https://www.ebay.co.uk/itm/DC-12V-300W-Car-Portable-Ceramic-Heater-Cooler-Dryer-Fan-Defroster-Demister-UK/391944035944?hash=item5b41af5e68:g:P0UAAOSwQcJaFO37
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Currently enjoying products from Ford, Mazda and Yamaha
Ste wrote: Avatars are fine, it's signatures that need turning off.

[MCN]

[grr666]

There's certainly scope to remove the plylining and dynamat and insulate the sides. .
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Currently enjoying products from Ford, Mazda and Yamaha
Ste wrote: Avatars are fine, it's signatures that need turning off.

[Nobby the Bastard]

*steps slowly away from the conversation
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
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