battery weight
 

please compare different lipo battery brands same voltage and amps vs weight. these max amps 14.8 V 6000"s are boat anchors LOL!

Those batteries are 590 grams going by their site

what about other brand lipos? any with same specs that are lighter?

Try some neuenergy or flightpower lipos. Specs will not be the same, but the performace will be better. I would say that a flightpower 4900 lipo will easily out perform that 6000 lipo. Not sure about the weight but the mfg website will have that info. Google is your friend...

EVO 20 5000mAh 14.8V 4S2P is 511 grams
save 80 grams over maxamps.

Have you weighed your MA packs directly?

I think the 4900 packs have been discontinued, Tower no longer has them on thier site, when I was ready to order a new 6s pack I had to settle for a 5000