how much cca is necessary for a truck battery?

[Donald]

Also, in spite of the fact that there are a lot of maintenance-free batteries out there, there are still plenty of rectangular capped batteries that need water maintenance. One hot summer can take the electrolyte below the level of the plates.

I am not sure I believe that.

 

[ironman_gq]

I've got 2 900CCA batteries in a jeep with a v8 and I can promise you there have been times when I've needed every one of those precious cold cranking amps. -40 and no block heater sure makes you appreciate good batteries. The jeep is over 40 years old and the only vehicle I know will start in any conditions, I've had it start when the brand new truck wouldn't and I've used it to jump the new vehicles.