Not sure who you are asking but there are some very light batteries out there, some being VERY expensive. Here is the info on the batteries my son and I have been using in our cars with lots of good luck. It says it is 60 pounds.
http://www.sears.com/diehard-platinum-automotive-battery-group-size-65-price/p-02850065000P


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time