Battery Finder: Search by Part Number
Search by part number
Match your old battery by part number or group size
Type the model or BCI group printed on the label (Interstate, Trojan, Optima, Odyssey and more). We show the exact battery or same-size replacements, plus lithium upgrades.
Results for “Group 31”
Group 31 size 12V · Group 31
Compatible replacements (5)
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Compatible size Interstate 31M-AGM 12V Group 31M AGM Dual Purpose Marine Battery – 925 CCA
Same 12V Group 31 size
12V · Group 31 · ~100 Ah · AGM · Cranking, Dual purpose · SKU 31M-AGM
$459.95In stock -
Compatible size Interstate 31M-AGM-A 12V Group 31M AGM Dual Purpose Marine Battery – 825 CCA
Same 12V Group 31 size
12V · Group 31 · ~100 Ah · AGM · Cranking, Dual purpose · SKU 31M-AGM-A
$289.95In stock -
Compatible size Interstate SRM-31 12V Group 31M Deep Cycle Marine Battery – 675 CCA
Same 12V Group 31 size
12V · Group 31 · ~98 Ah · flooded · Trolling motor, Dual purpose, House bank · SKU SRM-31
$194.95In stock -
Compatible size Trojan 31-AES 12V AES AGM Deep Cycle Battery, Group 31
Same 12V Group 31 size
12V · Group 31 · ~104 Ah · AGM · Trolling motor, House bank · SKU 31-AES
$402.57In stock -
Compatible size Trojan AES-31 12V AES AGM Deep Cycle Battery, Group 29/31
Same 12V Group 31 size
12V · Group 29/31 · ~104 Ah · AGM · Trolling motor, House bank · SKU AES-31
$395.00In stock
Lithium upgrades (4)
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Lithium upgrade Battle Born 100Ah 12V LiFePO4 Deep Cycle Batteries
Same Group 31 size, lighter and longer-lasting
12V · Group 27/31 · ~100 Ah · lithium · Trolling motor, House bank · SKU BB10012-SERIES
Price range: $799.00 through $1,049.00In stock -
Lithium upgrade EPOCH 12V 172Ah Cranking & Deep Cycle (Dual Purpose) LiFePO4 Battery
Same Group 31 size, lighter and longer-lasting
12V · Group 31 · ~172 Ah · lithium · Trolling motor, Cranking, Dual purpose, House bank · SKU 12172A-DP
$899.00In stock -
Lithium upgrade EPOCH 12V 300Ah Essential Series LiFePO4 Battery (3.84kWh)
Same Group 31 size, lighter and longer-lasting
12V · Group 31 · ~300 Ah · lithium · House bank · SKU 12300A-H
$1,249.00In stock -
Lithium upgrade EPOCH 12V 314Ah Eco Series LiFePO4 Battery (4.02kWh)
Same Group 31 size, lighter and longer-lasting
12V · Group 31 · ~314 Ah · lithium · House bank · SKU 12314-ECO
$849.00In stock
Not sure it fits? Text us a photo of your battery label and we'll confirm before you order.
Where to find your battery’s part number
Look at the top or side label of your old battery. Marine batteries usually show the brand and model (for example Interstate SRM-27, Trojan 27TMX or Optima D34M) and the BCI group size, such as 24, 27, 31, 4D or 8D. An “M” after the group (27M) is the marine version of the same case size. Dashes, spaces and brand names don’t matter when you search.
How we match
- Exact match: we carry that same battery model.
- Compatible size: a battery we carry with the same voltage and BCI group (case size). Check the use too: cranking (starting), deep cycle (trolling motor, house bank) or dual purpose.
- Lithium upgrade: a 12V lithium battery in the same group size, lighter and longer-lasting. Use a lithium-compatible charger.
Common marine battery sizes
- Group 24: smaller boats, trolling motors and starting.
- Group 27: the most common trolling motor and dual-purpose size.
- Group 31: higher-capacity trolling, house and starting batteries.
- 4D and 8D: large house banks and big inboard engines.
- 6V GC2 and L16: house banks wired in pairs (Trojan T-105, L16).
Can’t find yours? Text a photo of the label to (954) 743-0000 or contact us and we’ll match it for you.