Some Deep-Cycle Battery Info
Some data about minutes of RC per pound and cost per minute of RC. I chose to do only the larger batteries in Groups 30,29 and 31 which are essentially the same size.
This is information about deep-cycle performance, but most of these batteries can be used as cranking batteries if they meet your outboard CCA requirements. You can use this data when comparing cranking batteries if you compare CCA first.
Most of these batteries are marketed under multiple labels, so I noted that in the footnotes. Cost calculations were done with the cheapest version I could find at regular retail. Sale prices aren't reflected in the numbers even for batteries that are commonly on sale. Also be aware that warranty on the same battery may vary significantly under each label. For example, the JCI 29 battery is warranted for 3 years free replacement as a Diehard but only 18 months as an Interstate.
Also note that battery specs and labelling can change without notice, so pay attention to labels when you buy.
AGMS in order from highest cost per minute of RC to lowest:
| Battery |
Price |
Reserve Capacity(RC) |
Weight |
Minutes/Pound |
Cost per Minute of Capacity |
| Diehard PM-11 |
$295 |
205 minutes |
75lbs |
2.73min/lb |
$1.44 per minute of RC |
| Optima D31M |
$220 |
155 minutes |
59.8lbs |
2.6min/lb |
$1.42 per minute of RC |
| Trojan 31 AGM |
$239 |
177 minutes |
69lbs |
2.6min/lb |
$1.35 per minute of RC |
| Cabela's AGM 302 |
$240 |
190minutes |
62.8lbs |
3.02min/lb |
$1.26 per minute of RC |
| Duracell 31 AGM3 |
$180 |
200 minutes |
69lbs |
2.9min/lb |
$0.90 per minute of RC |
Conventional Batteries in order from highest cost per minute of RC to lowest:
| Battery |
Price |
Reserve Capacity(RC) |
Weight |
Minutes/Pound |
Cost per Minute of Capacity |
| Trojan SCS225 |
$230 |
225 minutes |
66lbs |
3.4min/lb |
$1.02 per minute of RC |
| Exide Nautilus NG-314 |
$148 |
205 minutes |
62lbs |
3.31min/lb |
$0.72 per minute of RC |
| Duracell 315 |
$95 |
185 minutes |
59lbs |
3.14min/lb |
$0.51 per minute of RC |
| Everstart Maxx 296 |
$100 |
205 minutes |
61.7lbs |
3.32min/lb |
$0.49 per minute of RC |
Notes:
1. Also sold as the Odyssey 31M-PC2150
2. Also sold as the Universal Power Technologies UB12110
3. Also sold as the Deka Intimidator 8A31DTM
4. Also sold as the Delco Voyager Pro 31
5. Also sold as the Deka Marine Master DC31DT
6. Also sold as the Interstate SRM-29, Duralast 29DP-DL, Diehard 29HM and ACDelco Voyager M29MF
