OK, but every connection you add you are raising resistance.
Maybe your local hobby shop can help you with the soldering for the same $3 and leave you with a better setup.

Better yet, don't add joints...
Smc and other quality non price gouging companies have direct wired packs for the same price as nano's. No solder no nothing, plug it in. Can't cross polarity, less resistance.

Some examples, more battery, poke around for a 5000 pack if that's what you want.
http://www.promatchracing.com/prodde...prod=2s650070c ($5 more than the nano and way more battery
http://www.smc-racing.net/index.php?...&product_id=70 (same as above)

Heard this is a good company too, need to change plug though
http://thebarnfloor.com/catalog/prod...oducts_id=3641
http://thebarnfloor.com/catalog/prod...oducts_id=4859