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I have that charger and I charge 6 5S 2700 MAH batteries at the same time on 24 volts all the time. But what do I know.

So, the 306B won't handle the job even if I double up on the power supply with a 24v 47amp unit?

What about the PowerLab 8 V2.

The batteries are Hyperian CX G3 4S 2500mah 25C. Says on the box you can charge at 6C. I probably won't charge that fast but I want a system that won't strain to do it.

Thanks,
MM

Just so you know, nobody is going that fast and you don't have to. The 306b is more than most of us need. I charge six 4s 2700's at a time on my 306b from storage mode to full charge in around 20 minute's. That comes out to about 2c per battery. Most of us don't need faster. There are a lot of us using that charger on 24volts and we are very satisfied with it.
As Far as the PL8 goes, I have one of those too Yes its faster if you crank it up but you would see any earthshaking differences maybe 2-3 minutes faster I charge my six 4s 3700's up from storage mode in the same 20 minutes on that one. so in 20 min my son and I both have six batteries each to go fly with.

Russel, Yes your 240 makes a difference and I wish we had 240 standard in the USA. 110-120 holds us back a lot. Your charger would still be happier and run cooler on 24v.

No, there is a storage mode that you use on the charger.

Also, the default setting for automatically shutting down to prevent overcharging is about 5000mah.
If you parallel charge, it will keep shutting down when it gets to 5000.
There is a setting where you can turn that feature off.
If you didn't get a manual with the charger, you can download one off the net.

I would think if trying to storage charge four 4S packs wouldn't the voltage would be 1/4 of what you want on each pack because, the charger sees it as one cell?

On the other point of charging packs with similar levels. If you're "balance" charging 4 packs wouldn't the charger shut down the one that reaches full charge first just like it does for individual cells when charging one pack at a time?

 

You ask some good questions. Because the packs are in parallel the charger just sees it as one big battery. Lots of this will make more sense once you charge a few packs up. The cells also balance themselves with each other on the board so one doesn't finish before the next. You will find all the cells end up extremely close if you were to measure them. The only exception might be if you have a cell that fails(another story)but you will know it. If you want to chat Sat afternoon or sometime Sunday let me know. I think you are on the right track. You will find this charger to be plenty fast even at 3c.