Angle grinders (mains vs battery): time to cut chains?

[Londoner2015]

Bennets published these reviews of motorcycle chains and locks: https://www.bennetts.co.uk/bikesocial/reviews/products/security/motorcycle-chains-and-locks/how-to-choose-the-best-motorcycle-security
It took 42 seconds to cut the best chain with a 115mm disc angle grinder – mains powered, as “a battery grinder is impractical for multiple cutting tests” .

As someone who has never used one of these thingies before, I wonder: how different would the results be with a battery angle grinder? And how long do those batteries last cutting this kind of chains? Does any one know? I ask because if some oxygen thief were to try to cut my Pragmasis chain, they’d most likely do it with a portable one.

Thanks!

[-]

With modern battery technology, battery powered angle grinders are just as capable.

I know a bloke who cuts up firewood all weekend at festivals, with a battery powered De-Walt circular saw. It went through a shed load of wood on one battery and sailed through the wood just as a mains one would.
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[grr666]

Stupid test is stupid, they don't knock and ask for an extension lead so they can plugin their Makita do they???
They only use battery grinders. So how these locks hold out against one fully charged 18v cordless grinder
is very relevant data. I don't imagine they carry spare batteries around.
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[stinkwheel]

You get battery powered electro-hydraulic shear cutters too which will go through your chain in under 5 seconds. It's what they used on the 16mm grade 80 load chain I used to chain my bike up with.

https://youtu.be/5QSfqHld-XY

Think about it, they have to cut the chain into short lengths before they sell it to you so there's no such thing as an uncuttable chain.

A decent battery angle grinder will have the same rev/torue as a mains one.

Be interesting to see what one of those double bladed cut-off saws would make of a chain because they go through stainless like it's butter.
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[Fizzoid]

[Londoner2015]

I see, thanks. So, in summary, a good battery-operated grinder should take roughly the same time.

I'm looking to have the bike version of the "Magnavolt car defence system" installed on my bike. Does any one know of any installers in the London area?

https://www.youtube.com/watch?v=bMtqRir7dco

[Londoner2015]

[Ste]

"Seven out of ten bikes aren’t locked at all, so while social media would have you believe that London’s streets are swarming with angle-grinder-equipped gangsters, the reality is that far too many motorcycles and scooters are simply an easy target."

They're not gangsters, they're bikelife vermin.

Anyway, those seven out of ten bikes which aren't locked at all are useful. Parking next to a more desirable bike that the owner hasn't bothered to lock up is more useful than knowing the finer points of how quickly each chain can be cut.

[Londoner2015]

[G]

This probably is more powerful than most mains 5" grinders;
https://www.youtube.com/watch?v=lBBx_R6zV3I

I still want to get one some time, but haven't been able to justify it yet unfortunately - I already have a more wimpy Ryobi that generally does a decent enough job - though does really need the 5ah (18v) battery for any reasonable run time - though I expect you could cut at least one lock with a smaller battery if you were doing that..

With the 3Ah 56v battery it should last a reasonable time.

It's likely way too complicated for the typical scrotes, but you can easily get a portable oxy- "gas axe" setup that should cut through most chains pretty quickly. And of course - in a lot of situations the chains aren't connected to something overly strong. Okay, you can't ride the bike away, but they can take it around the corner or whatever to carry on then.

[stinkwheel]

[Rogerborg]

[G]

Newer ones are often sold as 20v - and in some cases the same ones are sold in the USA as that the 56v above is sold as 60v.

I've got 0.5kg 4s lipo that can deliver around 7.5kw.

There's now options for 9" grinders - but less suited to the scrotes' uses.