Connecting 12V batteries in parallel

[Martin]

Hi All,

A discussion about parallel batteries (12V marine deep cycle) connection
for came up.  I wonder if anyone can shed some light on this.

There is a claim that connecting two batteries in parallel will result in a
death spiral due to the different state of the cells.  The claim is diodes
must be used to isolate the batteries changing and discharging.  I can
understand that a parallel battery connection isn't ideal for smart
charging circuits.

I am pretty sure I have seen commercial gear that had paralleled battery
connections and have used them in the past without problems.  The use case
I had in mind was for Field Day - using precharged batteries in parallel.
If capacity is lost due to parallel connection, any estimate?

TNX & 73,

Martin
W6MRR
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