Sometime ago I read a thread where posters explained the better and the worst of taking a lot of stuff to the field, in my very personal appreciation I like to go very "light" which means to go to the field with only the very necessary stuff. Then I stopped from taking to the field a very big tool box that I used to carry, instead of it I only use my oldie hobbico wood box which has been with me for about 20 years or so, in its drawer there are a couple of screwdrivers, two sets of Allen wrenches, a tach, a heat measurer device, my glow igniter, a wrench to tight or remove the prop nut, some clevises, bolts and nuts and that is it.
I have a heavy duty starter with a Hobbico battery:

http://www3.towerhobbies.com/cgi-bin...?&I=LW8234&P=E

I still have an old 7 amp. Battery which is inside the tool box and powers the panel which in turn powers the fuel pump. ( I occasionally use a wired glow igniter)
I transport my transmitter in a JR transmitter's case and I like to go to the field with a cooler with different kind of drinks.
When ever I have crashed a plane I have never done any repair at the field, so there is no reason (for me) to take any glue (even that it know that it is very needed for others in many occasions) or additional tool.
So if I were to buy a new battery I would go for the lightest one.

Regards.