Just to tidy up
If you need a little more help in re-packing the array, the photo below shows how it was done. The array is already a snug fit side to side. This is the
sides of the metal clad cylindrical cells. The thin packaging foam stuck to the sides of the array isn't really needed, that was me being too fussy.
The solder connections between the cells can be felt beneath the blue heat-shrink, these now safely occupy the airspace between the two bottom packing strips. If the array is left to continue flopping about, there is a very real chance of the heat-shrink being abraded away, allowing the connections to short across the alloy casing. The output leads occupy the other airspace. Three strips of draught-excluder give a soft cushion for the array to sit on.
Four strips, 18mm x 300mm were cut from 13mm thick closed-cell foam sheet. these were attached to the array using transfer adhesive, it's not important how they are stuck on, as long as they stay put. The pack was then lightly dusted with talcum powder. Once the pack was started into the alloy housing, I then up-ended the lot and allowed gravity to do it's job, yours truly disappearing in a cloud of talc!!. Don't be tempted to push hard on the top of the array, the BMS circuit board occupies the entire top area of the pack.
You can clearly see the slots in the bottom cap which hold the contacts, together with the square plate that retains them. The polarity is marked on the outside of the cap to help get this right. If the battery is to be used on a machine having opposite polarity, this is where the contacts need to be swapped.
The three pin XLR input for charging is default:
Pin 1: +42 volts (positive)
Pin 2: -0 volts (negative)
Pin 3: unused
When checking the polarity of a charger, it is very easy to cause a short through the metal XLR plug body. It's safer to check the polarity of a battery on which the charger has previously been used.
