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- Installation Support US-based battery experts
24V 90AH Group 31 LiFePO4 Deep Cycle Battery
SKU PGL24VM90
- Trusted by professionals
- Lightweight design
- Maintenance-free operation
Compact size. Lightweight lithium power.
90Ah capacity, just 41.89 lbs.
Deep-cycle power in a compact Group 31 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.
Complete your setup
Fits the PGL24VM90-
24V 20A Lithium ChargerLiFePO4 charging profile matched to 24V.
$299.99
-
Connect-Ease 24V Single Lithium KitTrolling-motor hookup for one 24V battery.
$109.99
-
Battery Box · Group 31Sized to a Group 31 battery.
$19.99
-
NOCO Battery Tray · Group 31Holds a Group 31 battery secure.
$9.99
The PGL24VM90 from Pro-Guide Batteries delivers deep-cycle reliability with 90 amp-hours at 24 volts, totaling 2304 watt-hours. This rugged battery features IP67 water and dust resistance, Bluetooth connectivity for monitoring, and a 100-amp BMS. Pro-Boost mode provides a 10% capacity reserve, making it ideal for marine, RV, and off-grid deep-cycle 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
- 8.9in / 226mm
- Weight
- 41.89lbs / 19kg
- Group size
- 31
Measure your battery tray or the battery you are replacing. If your tray takes a Group 31 battery this size, it drops in with no tray modification needed.
What you'll need to install
A Group 31 tray or battery box
The matching box and tray are 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: 41.89lbs / 19kg
- 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 | 31 |
|---|---|
| Voltage | 24 |
| Cold Cranking Amps (CCA) | N/A |
| Marine Cranking Amps (MCA) | N/A |
| Amp Hours | 90AH |
| Watt Hours | 2304WH |
| Charge Current (Standard / Max) | 10-18A / 45A |
| Terminal Type | 3 x Internal Thread (M8) |
| Weight (lbs / kg) | 41.89lbs / 19kg |
| Length (in / mm) | 13.07in / 332mm |
| Width (in / mm) | 6.93in / 176mm |
| Height (in / mm) | 8.9in / 226mm |
| 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
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.