Good Morning.

So following Oscar's info here: https://oscarliang.com/parallel-charging...rge-leads/ i went ahead and created one of these cables and it seems to work fine.

I just wanted to be clear on one point though.  When usually parallel charging say 4 batteries, i would add all their MAH together, then divide by 1000 to get the amount of amps i was going to charge at.

For example: 

4 X 4S 1500mah Batteries
4 X 1500 = 6000
6000/1000 = 6 amps 

When using the method Oscar posted about, so only charging through the balance cables is it safe to use the same maths?  I appreciate you would want to keep the amps down as you are using a small cable to pass the current to the balance cable, but i am only charging 300mah 2S batteries. So can i assume charging 5 of these at once i could charge at 1.5 amps? 

Hopefully this makes sense?

Yes, you are correct in your calculations. Most balance port wire gauge is around 20-22 awg. Lets assumes the thinner gauge of 22. 22 awg, you will go up to 8A. The method you link, I use it for my small 2S. If you have larger 4S packs, you do not need to use this method. You would parallel charge through the XT60 lead.

(05-Aug-2020, 09:20 AM)voodoo614 Wrote: Yes, you are correct in your calculations. Most balance port wire gauge is around 20-22 awg. Lets assumes the thinner gauge of 22. 22 awg, you will go up to 8A.  The method you link, I use it for my small 2S. If you have larger 4S packs, you do not need to use this method. You would parallel charge through the XT60 lead.

Thanks. Correct i am only using this on my smaller 2S Batteries that only have JST-PH connectors (Those bloody annoying things!).

4S would always be charged normally with the XT60 cable.

Surprised to hear 22awg can handle 8amps though!  According to different sites i found on google it suggested anywhere between 3amps and 6.3 amps. No where mentioned up to 8amps.

Either way the max i plan on doing is 1.5amps, so it all sounds fine.

https://oscarliang.com/wire-awg-chart-quadcopter-rc/

(05-Aug-2020, 09:25 AM)ITGeekLondon Wrote: Surprised to hear 22awg can handle 8amps though!  According to different sites i found on google it suggested anywhere between 3amps and 6.3 amps. No where mentioned up to 8amps.

Yeah, I've given up on Googling AWG max current ratings. The top search results always give really low numbers. 14AWG has a maximum current of 32A? Not in my quads, mate. I guess they're talking about professional use when there is a lot more at stake so they're bound to be more conservative. Decent silicone insulation makes a massive difference too.

Thanks Gents.

The fact is i only need it for 1.5 amps, so this has really answered my question!

Appreciate both of your responses!