Kill switch or ignition key

[His Dudeness]

I used to use the kill switch and switch the key off as the last thing I did, until I discovered that, of course, it leaves the headlight on.

So if you start and stop a lot of times in quick succession, the battery doesn't have enough time to recharge and eventually it'll be flat when you try to start again

If you started it in quick succession it'd be flat because of the starter motor not the bulbs. 700W vs 55W