RossDv8 wrote: ↑
Wed Oct 09, 2019 7:43 am
And because a Li-Ion power bank is a DC-DC converter, I would be connecting the output of the converters in parallel - NOT the cells in parallel.
Exactly the wrong conclusion. Many (not all) cell types can be paralleled, given identical cells of identical age. They are "designed" for it, but consult the manufacturer's datasheet.
Mains-derived supplies and voltage converters are often built as cheaply as possible, and working with another supply in parallel is not a design feature. Supplies should only be paralleled through reverse blocking diodes, which introduce their own problems of voltage drop and power dissipation. You need a good understanding of what you are doing before trying it. Don't assume the designers made it safe -- even if they did, "marketing" may have removed the safety elements.