Most of the companies still post the long-term draw specs - but if it's for stuff with wheels or tracks - you've got to search for it. If you are buying batteries for solar-electic - they always list the amp-hour ratings because that's about all that counts (for solar application).
For the type 31 batteries - the long-term draw specs are given in "reserve capacity" instead of "amp hours" - both are valid. The "reserve capacity" is the time the battery can deliver 25 amps and maintain a minimum terminal voltage of 10.5 volts at 80° F. A amp-hour rating is a little more ambiguous and is based on one amp draw per hour - but the amp hour ratings used for batteries have to be accompanied by an extra number or they don't mean much.
One example is a Deka 900 cold-cranking-amp battery. It has a reserve capacity of 180 and a 20 Amp Hour rating of 95, a 10 Amp Hour rating of 80, and a 1 Amp Hour rating of 50.
The battery Dodge calls for OEM for the first-gen. Cummins diesel has a reserve capacity of 170 minutes - so I suspect around a 20 Amphour rating of around 90.
I think I'm going to put in two group 27 automotive batteries. At least they come with a long warranty. Walmart has them for $69 each - 750 CCA and 180 reserve capacity. So, for $138, plus $20 in extra cables - I get 1500 CCA and 360 minutes reserve capacity. Seems to make sense. I realize, that in most cases - not that much battery is needed. But, when the rare case comes up - it's nice to have the extra cranking power.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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