[TriLUG] reason not to mix batteries in UPS

[Brian via TriLUG]

On 1/9/23 07:36, Joseph Mack NA3T via TriLUG wrote:
All the Li-ion batteries I know about
> are three terminal devices - you charge through one port and you 
> discharge through another. 
AFAIK, a single-cell Li-Ion battery only has two terminals.  Multi-cell 
packs have an additional terminal at each junction between cells.  Bulk 
current moves in both directions through the "end" terminals, and the 
"inner" terminals allow for cell balancing during charging.

I'm basing this description on my experience with RC vehicle charging. 
Big fat wires that can carry lots of current go to the ends, and wee 
little wires go to the inner junctions.  Your Mileage (and Hardware) May 
Vary.

-B