Balancing a pack makes all the cells the same voltage. How exactly can a charger balance all 4 cells if you balance them separately? If you balance charge 2 2s batteries separately and run them as a 4s you won't have 4 balanced cells you will have two pairs of balanced cells.

From iCharger manual:
If one pack gets balanced to a lower voltage you run the risk of running 2 of the cells under voltage.

....but why would it get balanced at a lower voltage? If it gets balanced at a lower voltage, it's user error... because the user selected a lower voltage. The iCharger does not make you select end voltage every time you charge. I've had a 306B since it came out.

Standard voltage for a LiPo battery is 4.20 volts. That's what any charger will default to, unless you manually change the setting. Unless there is a problem with your batteries, balancing the packs separately will have the same effect as balancing them together.

In balance mode, the charger applies voltage to the cell that needs it, then backs off and lets them equalize. The process is repeated till all cells maintain their target voltage for a predetermined period of time... and then your charger goes DING, and it's done.

You do You I guess.

LMAO dude, I'm doing it the normal way. I think you are just misunderstanding something.

You must have some serious kit if every time you charge a battery its coming off the charger at precisely the same voltage and the same as all of your other batteries. You must have won the charger lottery and run those new unobtainium LiPos.

Yep, that must be it.

It's the amps that is different between 2S in parallel vs series... in parallel you need to double the amps in order to charge the pack in same amount of time as you would with 2S in series.

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Let's not forget cell phones, laptops, and of course your TV remote control... even the 12v Lead Acid battery in your car is actually 6 cells in series.

Tesla is far from perfect, they are forced to provide additional heat shields from all the fires started from the extremely dangerous battery configurations in their cars... shrug


https://abc7news.com/tesla-electric-...factory/21997/

And it was the series connections that caused these issues? Please explain, needs a path of causation.

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I agree Tesla is far from perfect, just like most everybody else. Their choice of battery location has many sweet advantages, sadly protection from road debris intrusion isn't one of them. The industry has struggled with this going back to the GM Impact/EV1, and why some take a different approach for better protection. My concern has always included first responders, training, etc for the high voltages involved.

I don't believe I've seen series connections of packs be an issue in a damage report. Some even include disconnect features in the connections to reduce the electrical hazard in crash events.

Quite simple. The charger determines the finishing voltage. It doesn't matter if you have the two cells plugged in at the same time or not. The charger will charge them to 4.2V per cell then stop.