[SML] Battery packs for practicals

[Bruce]

Having taken apart more than one of these packs I don't know if that is 
correct - at least on the modern packs.  They ALL have contained an 
internal PCB that looks an awful lot like a BMS to me.  And when using the 
fan I mentioned the battery pack would indeed shut off on it's own at right 
around 11V showing on the meter. 

 Further investigation or evidence is needed.

JM2C

:Bruce

On Tuesday, September 22, 2020 1:22:23 PM CDT, Duncan Mahoney via 
Stagecraft wrote:
> One thing to be aware of with the Milwaukee M12 series of 
> batteries is that the protection circuit that protects the 
> battery pack from over-discharge is in the tools, not the 
> battery pack.  So it is quite possible to over-discharge a 
> battery pack if someone forgets to turn off the device when it 
> comes offstage.  Best case scenario is "bricking" the battery 
> pack.  Worst case involves what battery manufacturers refer to 
> as "venting with flame" and the rest of us refer to as an 
> explosion.  Milwaukee makes a battery holder for use in their 
> line of heated clothing, Part 43-72-1000, that has a 12-volt 
> jack and contains a protection circuit.  Rated power out is only 
> 1.5 amps constant, or up to 4 amps for 2 minutes, but it's a 
> good solution for low wattage devices
>
> Duncan Mahoney
> Head of Technical Direction
> Professor of Theatre Practice
> University of Southern California School of Dramatic Arts
>
>
>