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- Installation Support US-based battery experts
12V 390CCA Group U1 LiFePO4 Starting Battery
SKU PGLU1X
- Trusted by professionals
- Lightweight design
- Maintenance-free operation
Compact size. Lightweight lithium power.
390 CCA starting power, just 2.76 lbs.
Starting power in a compact Group U1 case. CCA shown as the lead-acid equivalent.
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 PGLU1X-
PGC-116 On-Board Charger · 12/16VOn-board charging with lithium and AGM profiles.
$179.99
-
NOCO Battery Box · Group U1Sized to a Group U1 battery.
$19.99
-
NOCO Jump Starter · 12V 500APortable backup start if a battery runs flat.
$89.99
The Pro-Guide Lithium U1X is a high-performance starting battery designed for Lawn & Garden equipment and other small engine applications, delivering 390 Cold Cranking Amps for reliable starts in any season. It features convenient Quad Terminals, a built-in State of Charge gauge, and Pro-Boost technology for enhanced starting power. Backed by a 3-year warranty, the U1X is built to start strong and last long.
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
- 6.85in / 166mm
- Width
- 4.84in / 123mm
- Height
- 6.42in / 163mm
- Weight
- 2.76lbs / 1.25kg
- Group size
- U1
Measure your battery tray or the battery you are replacing. If your tray takes a Group U1 battery this size, it drops in with no tray modification needed.
What you'll need to install
A Group U1 tray or battery box
A matching box is in Complete your setup.
Your existing battery cables
Reuse them if the cable ends fit the battery's terminals (2 x Internal Thread (M6)).
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: 2.76lbs / 1.25kg
- 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.
| Group Size | U1 |
|---|---|
| Voltage | 12 |
| Cold Cranking Amps (CCA) | PbEq 390 CCA |
| Cranking Amps (CA) | N/A |
| Amp Hours | 3AH |
| Watt Hours | 36WH |
| Charge Current (Standard / Max) | 1.5A / 15A |
| Terminal Type | 2 x Internal Thread (M6) |
| Weight (lbs / kg) | 2.76lbs / 1.25kg |
| Length (in / mm) | 6.85in / 166mm |
| Width (in / mm) | 4.84in / 123mm |
| Height (in / mm) | 6.42in / 163mm |
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.
Register your battery online to activate coverage. Full terms are on the warranty information page.
Downloadable Resources
Frequently Asked Questions
What is a lithium starting battery designed to do?
A lithium starting battery is designed to deliver the high burst of current required to start an engine or motor. It is optimized differently from a battery designed primarily for long-duration deep cycling.
How do I know if this battery will start my engine?
Compare the battery's cranking specifications with the minimum requirements provided by your engine manufacturer. Voltage, cranking output, physical dimensions and terminal orientation should all be confirmed before purchase.
Can I use a starting lithium battery as a deep-cycle battery?
Starting batteries are primarily designed for engine starting. If you also need significant capacity for electronics, trolling motors or other continuous loads, a dual-purpose or deep-cycle model may be more appropriate.
Can it power my fish finders and electronics?
Some starting batteries can support auxiliary electronics, but the amount of available runtime depends on the battery's capacity and the combined load of your equipment. For high electronics demand, consider a dual-purpose battery.
Can I use my existing charger?
Possibly, depending on the charger. Confirm that its charging voltage and profile are compatible with the requirements of your Pro-Guide lithium battery.