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[Marks DTM Calib]

I wouldn't, those caravan quick release terminals are designed for leisure battery usage where the peak currents are low, on a car the cranking amps can hit four figures!

[Bigron]

That's a good point; the ebay offering didn't give a current rating.
Way back in the dim and distant, I had a Renault 4 which had a quick disconnection screw-type thing, half-a-turn and it was done. I wonder if you can still get them?

Ron.

[Marks DTM Calib]

I have used these before (which looks like what was in the original post) and they have been generally ok....as long as they are well tightened when you go to start!

https://www.ebay.co.uk/itm/Heavy-Duty-Battery-Disconnect-Isolator-Cut-Off-Switch-12v-24v/172096775398?epid=1689092970&hash=item2811c464e6:g:E68AAOSwsE1aFZLJ

[Bigron]

Yep, that is similar to the isolator on my Renault 4, with no doubt a higher current rating!
Thanks, I may well get one of those for the Omega. 

Ron.

[Marks DTM Calib]

You can get them in about 1000A rating with a bit of looking 

[Bigron]

I've just looked!
This is a bit over-kill for my Omega, at 2500 amps cranking, but maybe for a diesel?

https://www.rotatingelectrics.co.uk/heavy-duty-battery-kill-switch-shut-off-250-amp-continuous-isolator-12-volt-k593
Also a bit dearer at £14.92 withoput the dreaded VAT! 

Ron.

[johnnydog]

I have used these before (which looks like what was in the original post) and they have been generally ok....as long as they are well tightened when you go to start!

https://www.ebay.co.uk/itm/Heavy-Duty-Battery-Disconnect-Isolator-Cut-Off-Switch-12v-24v/172096775398?epid=1689092970&hash=item2811c464e6:g:E68AAOSwsE1aFZLJ

These are often use in classic car circles as a theft deterrent due to them not having steering locks and more modern anti theft measures. They still allow a small current through a fused supply for radio memory / clocks etc, but insufficient for starting the car. The screw can be easily removed and is pocket size.
The isolator style with a large turn key is commonly used in caravans as an isolator for the power feed for the motor mover, again to help prevent theft and to cut the direct 12v supply to to the control unit when the motor mover is not required.
I personally think all these are over the top for what you require. A used replacement genuine VX battery terminal and cable with a 10mm pocket sized spanner is by far the cheapest and simplest method IMO, and won't look like it's been cobbled together.

[JDX]

I have used these before (which looks like what was in the original post) and they have been generally ok....as long as they are well tightened when you go to start!

https://www.ebay.co.uk/itm/Heavy-Duty-Battery-Disconnect-Isolator-Cut-Off-Switch-12v-24v/172096775398?epid=1689092970&hash=item2811c464e6:g:E68AAOSwsE1aFZLJ

That's exactly what I had & broke in the first place 
Being the tight arse I am, I'm now more annoyed because the one shown is a whole pound cheaper than the replacement I've ordered  ..Grrr

[aaronjb]

Just a thought but aren't the +ve and -ve terminals different sizes (one larger than the other) - were you trying to fit it to the right one?

I could be talking bollards, mind

[JDX]

Just a thought but aren't the +ve and -ve terminals different sizes (one larger than the other) - were you trying to fit it to the right one?

I could be talking bollards, mind

...possibly not! It wouldn't be the first time I've done something totally idiotic & I'm sure it won't be the last, if that is the case 

[dave-b]

I know where you're coming from, any longer than about three weeks standing and my Omega's battery is flatter than a witches t*t, and yes I have binned the powersounder!

[zirk]

Believe it or not I actually carry a small 10mm Plastic Ring Spanner (the UPS Safe Type, only because its lighter), point being it takes all but 10 seconds to remove the Neg Lead off a Battery.

[Rods2]

The quickest boot tool removal and battery disconnect I've ever done was when I was driving in my Ford Granada to see my wife in hospital just after a fairly major operation and smoke started appearing from the door panels, I stopped grabbed my tool rool from the boot and by the time I had disconnected the battery the car was full of smoke.

The problem was caused by a stuck central locking relay 10A is fine as a momentary unlocking pulse but not a continuous current. With a toolkit in the boot and quick thinking I got away with 5 melted and partially burnt central locking relays rather than a torched car.

[robson]

Maybe a suitably positioned spanner under the bonnet is the answer.

[Marks DTM Calib]

Pos and neg terminals are different sizes, the isolator should be fitted to the neg usually.