Ditto .. except I left my Oxford chain type lock in the pannier on one of those local missions and it was missing the next time I went further afield!!!
I bought these.
. I had reason recently to remove a reasonable secure padlock from a gate. .. one that had a rating of 6 on a scale going up to 9... I had lost the backyard key... Using a 700w 115mm angle grinder fitted with a diamond disk., It took less than 2 seconds..
I doubt anyone's going to be using that when you park your bike at the supermarket, too many people around. The lock I provided a link for pays out money if thieves break it, thousands of pounds worth of bike is covered, I think it's probably rated a 9 on the scale you mention.
... If say 4 youths were to be together adjacent to a bike rack, one hidden by the others produced a cordless angle grinder of comparable power , they would have a bike liberated in a few seconds, the three innocent youths would then saunter off, and the cyclist cycle off . Now there are plenty of conventional bikes even more expensive than ebikes,. . Diamond cutting disks aren't cheap.mine cost about 30 euro, but they are extremely effective., And one would cut a lot of hardened steel links before it's used up. .. mine has already been used on steel beams, granite , copper pipes , bolts etc ..
I don't know if you read the links, here is another.
Mal I don't doubt that theyt are a good product, I was looking at some locks today, to replace the lock stolen from my pannier.. ironic!. I do doubt their ability , if made of any steel, irrespective of additives to hold up a diamond bladed grinder for long. The only thing which will , would be ceramic beads embedded in the steel, and even they will eventually fail. Such composites are good against metal hacksaws , but oxyacetylene or diamond will win.
The thing for me is I bought the lock and know I will not use it that much, I intend to use it if I cycle into the next town, here in the Scots Border region we have lots of small towns ten miles and fifteen miles apart so I could cycle into one of the supermarkets, use the lock and be out in ten minutes.
