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- 10 Year Warranty 36-month free replacement
- Free and Fast Shipping Ships within 24 hours
- Installation Support US-based battery experts
12V 235AH Group 31 (Tall) LiFePO4 Dual Purpose Battery
SKU PGL31M235-DP
- Trusted by professionals
- Lightweight design
- Maintenance-free operation
Compact size. Lightweight lithium power.
235Ah capacity, just 52.91 lbs.
Dual-purpose power in a compact Group 31 (Tall) case.
Maintenance-free operation.
No watering or routine electrolyte checks.
Built-in battery protection.
Helps protect against overcharging, over-discharging and short circuits.
U.S.-based support.
Battery expertise since 1980, with a team you can call.
As low as$142/mo with
Complete your setup
Fits the PGL31M235-DP-
PGC-116 On-Board Charger · 12/16VOn-board charging with lithium and AGM profiles.
$179.99
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NOCO Battery Tray · Group 31Holds a Group 31 battery secure.
$9.99
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Bass Tank Power Harness · SingleClean power to your graphs, no voltage drop.
$199.99
The Pro-Guide PGL31M235-DP dual-purpose lithium battery provides outstanding performance, featuring a 235 amp-hour capacity (3008 watt-hours), a robust 200-amp BMS, and IP67-rated durability. Enhanced with Bluetooth connectivity for real-time monitoring and Pro-Boost technology that reserves 20% capacity, this battery is optimized for powerful starting and dependable deep-cycle use in marine, RV, and off-grid applications.
Will it fit your setup?
Three quick checks before you order: your tray size, your cable connections and your charger. Everything you need is below.
Dimensions
- Length
- 13.07in / 332mm
- Width
- 6.93in / 176mm
- Height
- 10.83in / 275mm
- Weight
- 52.91lbs / 24kg
- Group size
- 31 (Tall)
Measure your battery tray or the battery you are replacing. If your tray takes a Group 31 (Tall) battery this size, it drops in with no tray modification needed.
What you'll need to install
A Group 31 (Tall) tray or battery box
A matching tray or hold-down is in Complete your setup.
Your existing battery cables
Reuse them if the cable ends fit the battery's terminals (3 x Internal Thread (M8)).
A lithium-compatible charger
Lithium needs a LiFePO4 charging profile.
Basic hand tools
A wrench or socket for the terminal hardware.
Still not sure? Our US-based team will check it with you. 1-800-827-3232
- Weight: 52.91lbs / 24kg
- Built-in battery management system protects against over-charge, over-discharge and short circuit.
- Drop-in replacement when the group size and dimensions match your tray — no tray modification needed.
- Backed by 45 years of battery expertise and US-based support you can actually reach.
- 36 Month Free Replacement Warranty & 120 Month total Pro-Rata.
| Group Size | 31 (Tall) |
|---|---|
| Voltage | 12 |
| Cold Cranking Amps (CCA) | PbEq 1000 CCA |
| Marine Cranking Amps (MCA) | N/A |
| Amp Hours | 235AH |
| Watt Hours | 3008WH |
| Charge Current (Standard / Max) | 10-47A / 117.5A |
| Terminal Type | 3 x Internal Thread (M8) |
| Weight (lbs / kg) | 52.91lbs / 24kg |
| Length (in / mm) | 13.07in / 332mm |
| Width (in / mm) | 6.93in / 176mm |
| Height (in / mm) | 10.83in / 275mm |
| Bluetooth | Enabled |
| Heating | Enabled |
| NMEA 2000 | Compatible |
Shipping
Free ground shipping on this item, typically delivered within 24 to 48 hours. Oversized and freight items note any exception on the product page itself.
Warranty
36 Month Free Replacement Warranty & 120 Month total Pro-Rata.
Register your battery online to activate coverage. Full terms are on the warranty information page.
Downloadable Resources
Frequently Asked Questions
What does “dual purpose” mean?
A dual-purpose battery is designed to provide both the high-current output needed to start an engine and the sustained energy needed to power electronics and accessories.
Can I use this battery to start my outboard motor?
If the battery's starting specifications meet the requirements of your engine, yes. Check the engine manufacturer's minimum cranking requirements and compare them with the specifications of the Pro-Guide battery you are considering.
Can the same battery power my marine electronics?
Yes. Dual-purpose batteries are designed for applications where one battery may need to start the engine while also powering equipment such as fish finders, live sonar, pumps and other onboard electronics.
How is a dual-purpose lithium battery different from a starting lithium battery?
A starting battery prioritizes high cranking power. A dual-purpose battery balances starting power with additional usable capacity for electronics and accessory loads.
Do I need a lithium-compatible charger?
Use a charger with a charging profile compatible with the battery's LiFePO₄ chemistry and voltage. Always verify the charging requirements listed for the individual battery.