LOL !
No, they don't screw better after that )
Basicaly, you need to break in something that have a physical contact, like an engine piston inside the cylinder.
Electronic does not need breaking in.
About Lipo, manufacturers know about the "puffing" problem but they can't fix it (kind of like the dusts on a digital camera CCD)
So they try to get the customer not to overload the batteries to avoid having the product returned too soon.
Again, you don't need to "breaking in " Lipo batteries, but if you want to keep them healfy, avoid over discharge and heat.
The war between manufactures leaded to an over rating on Lipo capacity and discharge rate.
Peoples who buy the very expensives lipo batteries usualy don't have problems with them, they think that it's because they PAID ALOT it.
But in fact, thoses batteries (the very expensives ones) are NOT over rated, so customers don't push them too hard.
That was my 3 cents, now anyone can break in Lipo batteries if they feel like it.
Alex.