I got and old rusty one and put some paint on it so it's not very nickable. I leave it out at night but remove the battery. I use normal D locks but are tempte

I got and old rusty one and put some paint on it so it's not very nickable. I leave it out at night but remove the battery. I use normal D locks but are tempted to get an angle grinder resistant one although they are expensive - £150+.