Milwaukee M12 Stubby Impact Wrench Blinking Red Lights

the writing starts getting loose from the 
connector and you can get these christmas lights   so what's going on what's going on all 
right so you know i waited a long time   waited for a cell at home depot to 
get the gun that i really wanted   so it's a m12 stubby and used 
it a couple times this has the 4.0 uh battery uh that's also a deep socket 
from milwaukee what's great it works and then it stopped working lights are blinking 
why are lights blinking it's not christmas   it's not christmas so the only way to get 
this to work is if i actually push up on this   and it'll start working again right so it's 
working again right so you probably wonder   what the hell is going on battery's just loose 
so if this why this vibrates like a [ __ ] when it's like torquing and talking stuff 
the battery part down here gets kind of loose   right so let me kind of show you 
all right see that started blinking   all right push up on it works fine 
but when you're using it to bla torquing the hell out of it the battery 
starts getting loose from the connector this tab is probably a little bit lower 
than it needs to be it needs to be a little   bit higher because when this battery starts 
getting loose and it drops down then this pin   is not touching that pin to sense 
the battery now the pin on the   i don't know if you can see it there 
you go you see that pin right there   in the upper right hand corner so it doesn't touch 
it so if it doesn't touch it it's going to think   that there's something wrong with it maybe it's 
overheating or some [ __ ] so here's this gun   that tab is too short or this 
battery is uh this tab is too short freaking a i have two m12 xc 4.0 batteries 
right here and one of these it causes that christmas blinking light when i'm 
twerking and untorquing stuff on my m12 stubby and you might be wondering which one it is and i'll go ahead and show you which one so this 
pin right here see how high that sticks up   sticks up pretty high so then it 
will hit the um connector inside   see this one on this on the other hand i don't 
focus in on that one sits a little bit lower   and and is folded and is 
kind of pushed back and down   so this one doesn't work that well so only time 
when this battery works is if i'm holding on to   the bottom because all that vibration makes 
it loose and it and it doesn't connect well   versus this one which is a lot higher so even 
if it gets loose why it's torquing untorquing   it's high enough that it's 
always going to be touching the other connector inside the stubby 
that's the difference between the two

As found on YouTube