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12V 300AH Group 8D LiFePO4 Deep Cycle Battery
SKU PGL8D300
- Trusted by professionals
- Lightweight design
- Maintenance-free operation
Compact size. Lightweight lithium power.
300Ah capacity, just 72.75 lbs.
Deep-cycle power in a compact Group 8D 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$125/mo with
Complete your setup
Fits the PGL8D300
Pro-Guide Lithium // 8D300
With A Cycle Life Rated Up To 3000 Cycles @ 80% DOD, The Pro-Guide Lithium 8D300 Battery Is Your New Favorite Choice For Powering Your Boating & RV Adventures, Solar Storage, And More
- When you need power that’ll last, the Pro-Guide Lithium 8D300 Battery is there to support you. Get more out of your RV and other trolling motors, boating, solar energy storage, and deep cycle battery applications
- With cycle lives rated beyond 3000 cycles @ 80% DOD and a capacity of 300Ah, you get a battery that performs at a high level over its whole lifespan
- For the strongest connection possible for your deep cycle applications, the 8D300 comes with M8 Internal threaded terminals.
- A built in ABS Honeycomb Frame to keep the 8D300's cells protected of vibrations and improves the life span of the battery, sheltering it from the wear and tear that can cause other batteries to break down faster
- Built in 7 day sleep timer to keep the battery from self discharging over time, and the battery is tuned to wake up with a 50mah inrush or draw of amperage. Meaning that your charger or trolling motor will wake up the battery for use!
At Just 72.75 Pounds, The Pro-Guide Lithium 8D300 Battery Is One Of The Lightest And Longest-Lasting Deep Cycle Batteries Available
When you’re ready to hit the road in your RV, nothing should slow you down.
When you’re ready to take the boat out, nothing should get in the way of a smooth ride.
And when you want a battery that will support you on all your adventures, big and small, nothing performs quite as well as the Pro-Guide Lithium 8D300 Battery.
This deep cycle battery features an ideal mix of performance (certified up to 3000 cycles) and capacity (300 Ah) to go along with a lightweight (just 72.75 pounds!), stable design.
And even if you’re discharging it 80% every single time, you can still get 3000 cycles out of your Pro-Guide Lithium 8D300 Battery. That’s like 7 years of non-stop use. Crank the tunes, roll down the window, and enjoy the open road, because there’s no stopping you!
For a safer, stable battery that will let you enjoy the most out of your activities, trust in the Pro-Guide Lithium 8D300 Battery. Order yours today.
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
- 20.5in / 521mm
- Width
- 10.5in / 267mm
- Height
- 8.6in / 220mm
- Weight
- 72.75lbs / 33kg
- Group size
- 8D
Measure your battery tray or the battery you are replacing. If your tray takes a Group 8D battery this size, it drops in with no tray modification needed.
What you'll need to install
A Group 8D tray or battery box
Secure the battery so it can't shift in use.
Your existing battery cables
Reuse them if the cable ends fit the battery's terminals (Internal Thread (M8)).
A lithium-compatible charger
Lithium needs a LiFePO4 charging profile. The 12V 30A Lithium Battery Charger in Complete your setup has it.
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: 72.75lbs / 33kg
- 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.
- 60 Month Free Replacement Warranty & 120 Month total Pro-Rata.
| Group Size | 8D |
|---|---|
| Voltage | 12 |
| Amp Hours | 300AH |
| Watt Hours | 3840WH |
| Charge Current (Standard / Max) | 10A / 150A |
| Terminal Type | Internal Thread (M8) |
| Weight (lbs / kg) | 72.75lbs / 33kg |
| Length (in / mm) | 20.5in / 521mm |
| Width (in / mm) | 10.5in / 267mm |
| Height (in / mm) | 8.6in / 220mm |
| Bluetooth | Enabled |
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
60 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 is a deep-cycle lithium battery designed for?
Deep-cycle lithium batteries are designed to provide steady power over long periods and handle repeated charge and discharge cycles. They are ideal for trolling motors, marine electronics, RVs, solar systems, fishing electronics and other applications that require sustained power.
Can this battery replace my lead-acid or AGM battery?
In many applications, yes. A LiFePO₄ battery can replace a similarly sized lead-acid or AGM battery while offering more usable capacity and less weight. Always verify voltage, physical dimensions, terminal configuration and charging compatibility before replacing your existing battery.
What charger should I use with this lithium battery?
Use a charger with a LiFePO₄-compatible charging profile that matches the voltage of your battery. Some existing chargers may be compatible, but the charging specifications should always be checked before use.
Can I connect multiple lithium batteries together?
Certain Pro-Guide lithium batteries can be connected in series or parallel depending on the model. Batteries used together should be the same model, capacity, age and state of charge. Always check the specifications for the individual battery before building a battery bank.
Can a Pro-Guide lithium battery be mounted in different positions?
Because LiFePO₄ batteries do not contain free-flowing liquid like flooded lead-acid batteries, they offer significantly more installation flexibility. Follow the mounting recommendations provided for your specific battery.