Well I can give you the exact weight for the larger ones I have:</p>

Rhino 6S 3700mAh 25C with 6mm bullet connectors: actual 597g, advertised 600g</p>

Turnigy 6S 3600mAh 30C with 4mm bullet connectors: actual 580g, advertised 577g,</p>

Rhino 4S 2250mAh 40C with 6mm bullet connectors: actual 248g, advertised 263g</p>

As you can see they are correct!</p>

Also I have just realized that Xoar is offering 18x9 3 blade E prop, and that might just do the trick with Scorpion 4035-250 on 10S.</p>

http://www.xoarintl.com/props/model-airplane/PJI-E.html</p>