Hello,

I have a diy cable as in attached diagram, which I use to charge three 1s lipos by setting end voltage as 12.6 and it get detected as 3s. All works well.

I found in a YouTube video that, the same cable can be used charge two 1s lipos by shorting the 3rd battery connector.
Before I attempt, I want to ask here to make sure I am not doing anything stupid.

Thanks.

Here is a clearer diagram:

(28-Feb-2022, 10:40 PM)kafie1980 Wrote: Here is a clearer diagram:

Thank you.
Let’s say, I don’t have cell#3 to use with this cable, can I short that and still able to use the same cable to charge two batteries?

This depends upon the Charger. As kafie's diagram makes clear, while current can pass across the two connected cells, the charger balance lead will see a short circuit for cell 3.

IF you have pre-selected 2S, some chargers will allow this, but the question is not if it will work but rather should you do it, as it skirts a very fine line if any mistake is made or the more complex wiring fail.

There is a reason that most multi leads sold are parallel, as they are simpler and inherently somewhat safer.

I use parallel charging a lot, as for the school club I run I'm charging around 150 1S twice a week. No way could this happen on single connections. Five years experience, no issues.

(01-Mar-2022, 07:16 AM)BadRaven Wrote: This depends upon the Charger.  As kafie's diagram makes clear, while current can pass across the two connected cells, the charger balance lead will see a short circuit for cell 3.

IF you have pre-selected 2S, some chargers will allow this, but the question is not if it will work but rather should you do it, as it skirts a very fine line if any mistake is made or the more complex wiring fail.

There is a reason that most multi leads sold are parallel, as they are simpler and inherently somewhat safer.

I use parallel charging a lot, as for the school club I run I'm charging around 150 1S twice a week. No way could this happen on single connections.  Five years experience, no issues.

So you are saying even if I use three 1s lipos and use above cable to charge to 12.6V @ 0.3A, it’s still not safe?

Do you mind giving a parallel charging wiring setup.

i would gor for parallel charging these cells

(01-Mar-2022, 11:36 AM)hugnosed_bat Wrote: i would gor for parallel charging these cells

I was hoping some one can link a diagram, so that I understand how it is done as diy.

Again, another problem I see with parallel charging 1s with my current charger (toolkit m7) is,
It can do only balance charge. If I connect a 1s lipo directly without any balance port, charger simply throws balance port error.

on my toolkitrc m6is no issue on 1s, even "auto cellcount detection" works on 1s. maybe there is a software update for your m7?
that shouldnt be, 1s is a way more easy task than balance charge - terrible if its not supported software wise

I series charge 1s cells with a similar 4s harness to charge 4 lipos at the same time.

The main downfall with series charging us that if all the cells dont start at the same nominal voltage then the charger will detect a balance anomaly and charge at the lower balance charging rate to get the mismatched voltage equal across the individual cells again. Safe but slow.

(02-Mar-2022, 02:08 PM)hugnosed_bat Wrote: on my toolkitrc m6is no issue on 1s, even "auto cellcount detection" works on 1s. maybe there is a software update for your m7?
that shouldnt be, 1s is a way more easy task than balance charge - terrible if its not supported software wise

I see there is v2.01 (mine is v2.00).
I wonder if this will address the issue. But no release notes available.
Also I don’t know how to go back to 2.00 if 2.01 create more problems.

these arent beta versions, i guess there wont be a need to step back, it should be an improvement.
i updated my m6 once, i beleive downgrade would be the same way. for the m6 older versions was also available on the website if i remember well.

(03-Mar-2022, 07:55 AM)hugnosed_bat Wrote: these arent beta versions, i guess there wont be a need to step back, it should be an improvement.
i updated my m6 once, i beleive downgrade would be the same way. for the m6 older versions was also available on the website if i remember well.

I took v2.01 update and now I can charge 1s lipo.

nice :-)