While looking through "List Your Setup" for some idea on what battery
capacity I would need to run a Scorpion 3020-890 kv motor running
an APC 11 x 5.5,I noticed that in Chris Rigotti / Resolve EP setup
it has a 4S 2P 20C 3400 mah battery,question does this mean two
batteries, 4 Cell's of 1700 mah capacity , wired up in parallel to give
3400mah?
If yes, do you buy these as a special order,and how do you manage
2 balance connections when charging?
Paul Allen 

I believe Crist's packs are made that way--so 2 cells each are wired internally in parallel, then the 4 sets at wired up serially. So there is only one balance connector--each parallel set balance automatically, since they are always at the same voltage.

You can actually hook up in parallel a 4s2100 pack to a 4s1000 pack to make an equivalent 4s3100 pack. As the combo pack discharges, the 2100 pack will provide, automatically, about 2/3 of the total current. I sometimes think of that option if I would be in the situation of lacking 10% or so of the needed capacity. Simply attach a small light pack (500maHr for example) in parallel. That would give me 2600 mAhr (assuming I am using my "standard" 2100 packs).

Not something I would plan on doing if I could avoid it by having a 2600 pack in the first place, but it would preserve my 2100 pack investment if the occasion arose.

Crist
        OK, I have just draw up your pack construction and
now I understand the balance connection.
Also the battery straps you use on your profile's where do
you buy them?

Alan
      Good idea with the booster pack,I ordered some more 2600 mah packs
to give me some buffer on the original 2200mah packs.

Thanks to both for info
Paul Allen
 

Also the battery straps you use on your profile's where do
you buy them?

Paul,  I can fix you up with all the velcro you need, I have a couple of rolls of the stuff.  ie Black, 1cm wide, double sided.

Is that what you are after?

Cheers
Warren

Hi Paul,
I get mine from the local DIY store, (Gardening section). They are the velcro straps used to attach plants etc to stakes. Available in a variety of colours to suit your paint scheme.

TTFN
John.