Dangermouse449
Husqvarna
Pro Class
I know it shouldn't, trying to figure our why it did.
All modern 4st bikes have an automatic de-compressor on one of the cams. They use a 'bob-wieght' that swings out to disable the mechanism when the engine gets fast enough to run.
A spring pulls the mechanism back in to the 'operate' position when thhe engine stops.
If the engine stalls on the compression stroke, the mechanism sometimes doesn't release compression & the (weak, light duty lead/acid) battery can't crank through compression.
This is why the lithium batteries are better, they are the same physical size, but way more cranking amps to pull through these events.
Try deliberately stalling the engine a few times & restarting with your volt meter attached, you will see it will dip very low on cranking.