You might note your system and use.  What batteries, what flight system, what charge or voltage remaining after flying.....

Proper use of parallel charging does not inherently mean shorter battery life.  In addition to having same cell count batteries, it is best to have relatively similar packs with respect to age and internal resistance. 

Explain more of your routine.

I thought the most important consideration using a paraboard (besides same cell count) was making sure the batteries were all at the same voltage before plugging in?  I'm surprised nobody mentioned that yet.
Maybe I'm mistaken.

That's true, charger won't balance each individual cell on each battery as it reads only as many cells as one battery has. ex if you're charging two 4cell batteries you have 8 cells but charger only reads 4 cells. You need to periodically balance charge each battery pack individually to even them out.

MM

I read this a lot, but it does not make sense.
If you have the balance leads connected then all parallel cells will end up at the same voltage. Nothing else is possible.
So if the charger says that the "pack" is balanced then every pack you have plugged in will be balanced.

One issue I found with the paraboard is the LED that some of them have is connected to only one of the "cells", not the total voltage.
If you leave the batteries plugged in after charging/discharging/storage/whatever the voltage on that set of cells will end up lower. I disconnected the LEDs on mine to avoid this.

Pat MacKenzie

I am using 4 Zippy compact 3000-5S-40C batteries.  They are discharged to about 30% after a flight.  The charger is an icharger 106B+.  After charging the cells 1 thru 4 read 4.178 to 4.193 and cell 5 reads 4.244 to 4.251 on all 4 batteries.