I have a 615 duo3+ and have a question about tvc.

since most races still allow 4.22v/cell, i adjusted the tvc to 4.225v. but since i run only 1s, the charger still stops early. when the charger stops charging the batt still ready 4.195v. so does the tvc not come into effect without the balancer? and why does it stop early i mean 4.20v should be where the voltage stops not 4.195v

Hopefully, you'll get an answer on your post on RC Groups.

yeah, was not sure if many of those guys run 1s. but i have tried a bunch of stuff and it looks like without the balance port, the tvc settings are not active.

Even if they don't, they'll do what it takes to get you some kind of answer - seen it before. This had to be addressed during beta testing, they are too thorough to have not addressed it.

You may be correct that with 1S, TVC is disabled, but it'd be nice to know for sure and understand the reasoning behind that.

i agree. I am new to this charger.

have another question that you might know. storage charge. how does it know when to stop charging? most other chargers have a voltage peak cut off. but i did not find this in the duo. from what i can tell, it does not work on 1s packs either. basically i discharged to 3v/cell and then i am running a storage charge and it is still charging and the pack is at 4.02v

well, nevermind. they just stopped charging. it looks like it uses a % of capacity.

It targets 3.85V per cell resting voltage. Notice it will stop every so often to check voltage, the volts will drop (or rise if discharging) a little.

That said, they are known to storage charge to higher than that, the storage deal works better on the discharge side.

Why would you discharge to 3.0V? Not good for battery condition, capacity, life, or IR. Especially if you did it with the charger (what I’m assuming from your comments & why I bring it up), as at a lower constant discharge rate that is effectively a much deeper discharge than hitting a LVC under a relatively larger peak amp draw, and thus larger voltage drop.

Not saying it’s a big deal, but if you’re worried about 0.025V that will last until the first wiggle of the steering servo….. Taking care of depth of discharge and storage procedures will give you more performance than that very little overcharge ever will.

i understand what you are saying on the discharge, but that is not what I see on this charger. basically when discharging it looks like it hit the voltage and cuts off. because once the load is no longer applied, the pack rests at ~3.4v.

also on storage, it is not looking at 3.85v resting. my packs after storage are resting at ~3.96

i understand what you are saying on the over charging, but at a race, i am not going to leave anything on the table. so if the cut off is 4.22v, that is what I am going to tech with. voltage is voltage and in 1s, it is even more important.

and again the question is does this charger do what it is suppose to not am i taking care of my lipo correctly

Fair enough, my apologies if I was out of line.

Like I mentioned, I see about the same thing on a storage charge. A storage discharge does hit 3.85V pretty well. Don't know why. For the record this is with V4.5 firmware on a Duo3.

I think you are correct on the original question, I think I've seen it discussed for charging the single cell micro copter batteries, the balancer connection is still recommended. But I'm not positive.

how would you connect a 1s in balance mode. i guess you would have to rig somthing? i have never seen a 1s balance connector. lol

i will try a storage with a pack that is over the 3.85v and see what that does. i won't be racing anytime soon, so i thought i would put all my packs in a storage mode. i just assumes that they would all be about the same resting voltage. but if they are different between charge and discharge, then i will have to make sure that i do my storage all the same way.

Yep, I think you would have to rig up the balance connector yourself to try it. Never seen a ready made one, other than a parallel adapter for charging multiple micro copter single cells.