New lipos from Hobbyking!

[Diamondback]

ok, just read through the instructions for the EOS 0720i SD3.

the instructions say that if you try to charge a lithium type battery with no Balance tap fitted,
the charger will display "NO BALANCER" and it is not recommended to do this.

i tried it on a 2S lipo that i have, and the message does come up, but you can override it.
it then gives a second warning that says "BALANCER ADVISED" you can override this too, and it does start charging the pack.
so it seems that it the Hyperion will charge with no balance plug fitted.

i wouldn't feel safe just charging a lithium type pack with no balancing happening.
i know that a lot of people here will say it's ok, but id rather not.

it's only a matter of time till a 7S pack shows up that has a single balance tap.
i am hoping that the battery manufacturers start making batteries with a single 8 pin balance plug
before i want / need to buy my next batteries......

Jason.

[motomech]

WOW!!!
A whole new line-up of Compact 8S and 9S.

18S with only two bricks!

This is getting really exciting!

http://www.hobbyking.com/hobbyking/stor ... PoConfig=9

[cwah]

They still have 2 balance plugs. So not really handy to balance/charge.

[Hillhater]

so it seems that it the Hyperion will charge with no balance plug fitted.

i wouldn't feel safe just charging a lithium type pack with no balancing happening.
i know that a lot of people here will say it's ok, but id rather not..

I would guess that the majority of Ebike Lipo users only charge with the balance leads connected once every 10 or so charges once they "know" their packs are stable.
Generally its not necessary unless you are looking for 90%+ DOD ( like the Aero RC users) ...
....and it simply takes too damm long !!

Personally i never balance charge, but simply monitor individual cells and occasionally "boost charge" any cell that may be lower than the others.
It also helps that many of us run multiple packs in parallel, with the balance wires connected so that the packs tend to automatically "balance" their paired cells.

[keysersoze310]

Actually, if the hyperion can't charge them 'out of the box', which charger can charge them?

Oh, here's a weird way I think you could charge two of these 7S batteries with a hyperion charger with no additional parts or adapters. I don't really recommend this, lol.

This works because the hyperion balance board connectors are all paralelled - ie all the pin 1's are connected, all the pin 2's are connected, etc.

First you would need to figure our which balance plug comes first in series. The last pin of one connector is paralleled to the first pin of the other connector. For this example lets say the 4S connector pin 5 is paralleled to pin 1 of the 3S connector. If this is incorrect, just reverse the two connectors in these these instructions.

What you can do is first plug the 4S connector into the hyperion balance board's 4S connector slot, like usual. Then you would connect the 3S connector on the right side of the 7S connector on the same balance board. There alignment guide of the balance board connector will not fit correctly, so you will have to trim a small slot into the 7S balance board receptacle connector to get the 3S connector to fit. This should be fairly easy.

Do this procedure on both balance boards and viola, you can charge two 7S batteries with the hyperion charger with no adapters.

Or you can do it the much better way and just use a 7S connector...

[motomech]

Like this one mentioned earlier.
http://www.ebay.com/itm/7S-JST-XH-Conne ... 1e5dcef2fc

[cwah]

4.30USD + 2USD shipping cost just for a balance plug?
Isn't it a bit expensive?

[wesnewell]

4.30USD + 2USD shipping cost just for a balance plug?
Isn't it a bit expensive?

Yes. I found them in bulk for about $1 each about 6 months ago on ebay bulk section.

[wesnewell]

Under a buck each with free shipping. take your pick.
http://www.ebay.com/sch/i.html?_trksid= ... t&_sacat=0

[neptronix]

^-- pure win

Wouldn't be hard to convert these over to 7S, just a bit of a pain in the butt of soldering.

[keysersoze310]

^-- pure win

Wouldn't be hard to convert these over to 7S, just a bit of a pain in the butt of soldering.

Why do a lot of soldering? Couldn't you just pop the pins out of the 3S and 4S connectors and pop them directly into this bare 7S connector housing?
http://search.digikey.com/us/en/product ... -ND/923773

You would have to solder the first and last wires from the two connectors together, but even with that it is only a couple minute operation.

[neptronix]

....duh, i didn't think about that. You win

<-- ( just gone done soldering a bunch of parallel harnesses together, was still thinking in that mode. )

[migueralliart]

They still have 2 balance plugs. So not really handy to balance/charge.

U can convert both of the 4s balance connectors with some easy to do wiring to a single 8s. That is if you have a charger that can do 8S.


It actually works out even better because some of the cheap low volt alarms are actually 8S

[motomech]

^-- pure win

Wouldn't be hard to convert these over to 7S, just a bit of a pain in the butt of soldering.

Why do a lot of soldering? Couldn't you just pop the pins out of the 3S and 4S connectors and pop them directly into this bare 7S connector housing?
http://search.digikey.com/us/en/product ... -ND/923773

You would have to solder the first and last wires from the two connectors together, but even with that it is only a couple minute operation.

Blam! Problem solved.
I had a feeling this topic had lot's a life yet, that's why a bumped it.

Is there any reason, except for pure economy, to use anything else than these bricks in 14S and a Hyperion 1420i for a low-powered LIPO set-up?

[wesnewell]

Sure, if a cell fails, you're out the cost of a 7s pack. You can do the same using a 4s and 3s pack and if a cell fails you're only out the cost of a 4s or 3s pack. Sorry, I just can't find a reason to buy a 7s pack with 2 balance cables.

[mrdavies]

hey folks, some quick advice please....
i just got my 7s compacts in and i'm planning on combining the 3s and 4s balance plug on one JST plug.
yes, i understand that each cell will be set up in a series with the positive (red) on one side and the negative (black wire on the other side) on the JST balance plug. Does this mean that i just cut off the " extra" black wire? or does it need to be soldered to the other black wire?
im a bit confused here... thanks for your help
thanks guys !!

[ElectroSurf3r]

2 of the wires are redundant and go to the same tab connection. Where the two plugs meet, between the third and fourth cell.
Cut one of those 2 wires and you'll be good to go.

[ElectroSurf3r]

Actually, if that plug actually needs a positive and negative wire for EACH cell, then that is a PITA.
If that's the case, then DON'T clip the redundant wire; it will be useful. You will have to add in 5 more wires, soldering one to each of the other 5 wires BETWEEN cells, for a total of 14.

[Diamondback]

looking at the 7S plug, it looks like it just needs the 8 wires. not 14.

jason.

[mrdavies]

got it guys ... thanks !!