[Land-speed] Data Battery

[DougOdom]

My friend that runs a Super Modified roundy round car is going to put a 
Data recorder system on his car. He does not use a battery  and weight 
is of some importance. What is the best small 12 volt battery that 
anyone has come up with? I run 2 large 12 volt batteries in my car so 
I'm no help to him at all.
Doug Odom in big ditch  fussin with a really cool 56 Nomad ( not mine).