1-800-827-3232
Find Your Battery
10 YR WARRANTYBLUETOOTH
Cranking + Deep Cycle in One
Dual Purpose Lithium Batteries
One battery that both starts the engine and runs the house loads — for rigs and machines that do not have room for two banks.
Dual Purpose LiFePO4
Cranking amps and deep cycle capacity in a single Group 31 case.
- 10 YR WARRANTYBLUETOOTH
- 10 YR WARRANTY
- 10 YR WARRANTYBLUETOOTH
Two Banks, One Box
When There Is Only Room for One
A dual purpose battery carries enough cranking amps to turn the engine over and enough usable capacity to run electronics and accessories afterwards. On a boat with a single battery tray, or a machine with no space for a second bank, that is the difference between going out and staying home.
Lightweight & Long-Lasting
A fraction of the weight of lead-acid
36-Mo Free Replacement
Plus a 10-year limited warranty
45 Years of Expertise
Dependable battery solutions since day one
Trusted by Professionals
Anglers, courses, fleets and dealers alike
One Battery, Both Jobs
Talk to a battery expertWhere Dual Purpose Fits
Single-bank rigs, work boats and utility machines.
- 10 YR WARRANTYBLUETOOTH
- 10 YR WARRANTYBLUETOOTH
- 10 YR WARRANTY
- 10 YR WARRANTYBLUETOOTH
- 10 YR WARRANTYBLUETOOTH
- 10 YR WARRANTYBLUETOOTH
- 10 YR WARRANTY
- 10 YR WARRANTYBLUETOOTH
- 10 YR WARRANTYBLUETOOTH
- 10 YR WARRANTYBLUETOOTH
- 10 YR WARRANTYBLUETOOTH
- 10 YR WARRANTYBLUETOOTH
Lithium vs. Lead-Acid
Why Pro-Guide customers make the switch.
| Specification | Lead-Acid (standard) | Pro-Guide LiFePO4 |
|---|---|---|
| Weight | ~65–70 lbs per battery | ~24–28 lbs per battery |
| Lifespan | 1–2 years typical | 10+ years |
| Charge time | 8+ hours | 2–3 hours |
| Maintenance | Regular watering and terminal checks | None |
| Warranty | 90 days – 1 year | 10-year limited + 36-month free replacement |
Compare Dual Purpose Lithium
Because our customers shop by the numbers.
| Model | Voltage | Capacity | Group Size | Best For | Price |
|---|---|---|---|---|---|
| 12V 180AH Group 31 LiFePO4 Dual Purpose Battery | 12 | 180AH | 31 | Cranking and deep cycle in one Group 31 | $1,399.99 |
| 12V 235AH Group 31 (Tall) LiFePO4 Dual Purpose Battery | 12 | 235AH | 31 (Tall) | Maximum capacity in a tall Group 31 tray | $1,699.99 |
Frequently Asked Questions
Choosing the Right Battery
What is the difference between starting, deep cycle and dual purpose?
A starting battery delivers a short, very high burst to crank an engine. A deep cycle battery discharges slowly and steadily for electronics and motors. A dual purpose battery does a measure of both, which is what you want when there is only one battery on board.
What does LiFePO4 mean, and why does Pro-Guide use it?
LiFePO4 — lithium iron phosphate — is the most thermally stable lithium chemistry in common use. Compared with lead-acid it holds voltage under load far longer, weighs a fraction as much for the same usable capacity, and needs no watering or terminal maintenance.
How do I know which group size I need?
Group size describes the case dimensions and terminal layout, not the capacity. Match the group size stamped on your current battery — every product page lists the group size and dimensions so you can confirm it fits the tray you already have.
How many amp hours do I actually need?
Add up the amp draw of everything the battery has to run, multiply by the hours you want between charges, and leave some headroom. If you would rather not do the math, our team will size it with you over the phone.
Charging & Maintenance
Can I keep using my existing lead-acid charger?
A lead-acid charger can undercharge a lithium pack and shorten its life. Use a lithium-compatible charger — everything in our Lithium-Compatible collection is profiled for LiFePO4.
What maintenance do these batteries need?
None of the routine watering or terminal cleaning that flooded lead-acid requires. The built-in BMS manages charge and discharge protection automatically.
Warranty & Support
What warranty comes with these batteries?
Terms vary by product line — the term for each battery is listed on its product page, and the full details are on our Warranty Information page. Register your battery online after purchase to activate coverage.
What if I am still not sure which one to buy?
Call our US-based battery team on 1-800-827-3232 before you order. Tell us the machine, the tray you are working with and how long you need to run between charges, and we will point you at the right part number, or message us.
One Bank, Both Jobs
Match a dual purpose pack to your tray and your cranking requirement.