Odyssey 31M-PC2150 Marine Dual Purpose Battery
Odyssey 31M-PC2150 Marine Dual Purpose Battery is BCI Group Size 31 battery which combines good starting power and deep cycling capabilities. Odyssey 31M-PC2150 Marine Dual Purpose Battery is very similar to Odyssey 31-PC2150 Heavy Duty Commercial Battery, and they are both suitable for various roles, including trolling motor battery, cranking battery and similar.
Odyssey 31M-PC2150 Marine Dual Purpose Battery and Odyssey 31-PC2150 Heavy Duty Commercial Battery differ in terminals and sometimes in type of casing. If required, Odyssey 31-PC2150 Heavy Duty Commercial Battery can be ordered from manufacturer with metal casing for higher maximum operating temperature.
For marine, RV and similar applications, go for 31M-PC2150 model - just be sure that terminals fits, since 31M-PC2150 and 31-PC2150 are electrically the same batteries.
Technical specifications of the Odyssey 31M-PC2150 and Odyssey 31-PC2150S batteries are given in the following table:
| Battery | Nominal Voltage | CCA | HCA | MCA | Max. 5s Current | 20h Capacity | 10h Capacity | RC | Dimensions (LxWxH) | Weight | Terminals |
Odyssey 31M-PC2150 |
12 V | 1150 A | 1545 A | 1370 A | 2150 A | 100 Ah | 92 Ah | 205 min | 13 x 6.8 x 9.41 inches 330.2 x 172.7 x 239.0 mm |
77.8 lbs 35.3 kg |
SAE and 3/8” Stud (Pos.); 5/16” Stud (Neg.) |
Odyssey 31-PC2150S |
12 V | 1150 A | 1545 A | 1370 A | 2150 A | 100 Ah | 92 Ah | 205 min | 13 x 6.8 x 9.41 inches 330.2 x 172.7 x 239.0 mm |
77.8 lbs 35.3 kg |
3/8” Stud (SAE version also available) |
Note: Link in the table is Amazon affiliate link (opens in the new window).
Odyssey 31M-PC2150 is Absorbed Glass Mat (AGM) battery - it has non-spillable electrolyte and it can operate in any position. Its thin plates are made using 99.99% pure lead, are densely packed providing good starting power and they can handle 400 charge-discharge cycles up to 80% of maximum discharge.
Due to the shape of the plates, Odyssey 31M-PC2150 battery is heavier than similar Size 31 batteries with spiral wound plates.
Case and internal battery design and used materials increase vibration and high impact shocks resistance, when combined with common, flooded lead-acid cells.
Odyssey 31M-PC2150 battery is very temperature tolerant. Its operating temperature ranges from -40°F (-40°C) to 176°F (80°C) - if one places hand onto the -40°F or 176°F battery casing, some severe frostbite/burns might occur.
Odyssey 31M-PC2150 vs. Exide XMC-31 vs. Optima D31M BlueTop
Comparison of these BCI Group Size 31 batteries is given in the following table:
| Battery | Odyssey 31M-PC2150 | Exide XMC-31 | Optima D31M BlueTop |
| BCI Group Size | 31 | 31 | 31 |
| Battery Type | AGM | AGM | AGM |
| Dimensions | 13 x 6.8 x 9.41 inches | 13 x 6.6 x 9.4 inches | 12.81 x 6.56 x 9.38 inches |
| Weight | 77.8 lbs | 71 lbs | 59.8 lbs |
| Capacity (20h) | 100 Ah | 100 Ah | 75 Ah |
| CCA | 1150 | 925 A | 900 A |
| MCA | 1370 | 1110 A | 1125 A |
| RC | 205 | 200 min | 155 min |
| Price on Amazon | Odyssey 31M-PC2150 |
Exide XMC-31 |
Optima D31M BlueTop |
Note: Amazon links in the table are affiliate links.
As one can see, physical dimensions are very similar, after all they are all BCI Group Size 31.
However, Optima D31M BlueTop (photo on the right) is some 11 pounds lighter than Exide XMC-31 and some 18 pounds lighter than Odyssey 31M-PC2150 battery.
Also, Optima D31M BlueTop has the lowest 20h capacity - 75Ah, compared with 100 Ah of Exide XMC-31 and Odyssey 31M-PC2150.
Although lighter and having smaller capacity, Optima D31M BlueTop has CCA and CA rating very similar to Exide XMC-31, while Odyssey 31M-PC2150 outperforms both of them regarding starting power - its CCA rating is slightly better than Optima D31M BlueTop and Exide XMC-31 MCA rating.
Odyssey 31M-PC2150 has slightly larger Reserve Capacity than Exide XMC-31 - 205 minutes vs. 200 minutes, while Optima D31M BlueTop has RC value of 155 minutes.
Price comparison - Although price of the marine batteries varies, Optima D31M BlueTop is slightly cheaper than Exide XMC-31, but often can be found at the same price, or even Exide XMC-31 can be found cheaper. Odyssey 31M-PC2150 usually costs more than these two batteries. Price difference is not so large, so choose the battery according to your needs:
- dual purpose marine battery with good starting power, but taking into account weights and costs - go for Optima D31M BlueTop (perhaps Exide XMC-31, if weight is not issue, and deep cycle performace is important),
- dual purpose marine battery with good starting power, but not taking into account weights and costs - go for Odyssey 31M-PC2150,
- dual purpose marine battery with good deep cycle performance, but taking into account weights and costs - Exide XMC-31,
- dual purpose marine battery with good deep cycle performance, but not taking into account weights and costs - Odyssey 31M-PC2150.
Long story short - Optima D31M BlueTop is dual purpose battery with excellent starting power, Odyssey 31M-PC2150 is dual purpose marine battery with excellent starting power, while Exide XMC-31 with its starting characteristics is similar to Optima D31M BlueTop and with its deep cycle characteristics is similar to Odyssey 31M-PC2150.
For more info about Optima D31M BlueTop and Exide XMC-31, please check our articles:
- Optima D34M, D27M, D31M BlueTop Dual Purpose Marine Batteries
- Optima RedTop, YellowTop, BlueTop Batteries - Comparison and Recommendation
- Exide MC-31 and XMC-31 MEGACYCLE AGM-200 Sealed Maintenance Free (AGM) Marine Batteries
Long Story Short: Odyssey 31M-PC2150 and Odyssey 31-PC2150S are two premium AGM non-spillable, maintenance-free batteries.
They don't come cheap, but they are high power, high capacity, very reliable batteries that will provide plenty of power even in the worse conditions and most demanding situations.
For more reviews and recommendations, feel free to check Odyssey 31M-PC2150