48V 2X EAGLE 2 KIT
LiFePO4 - 64Ah - 3.26kWh
Starting at $1,645
or $69/mo
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12-Year Battery Warranty 12-Year Battery Warranty
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ISO 9001 Certified ISO 9001 Certified
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CEC Listed Systems CEC Listed Systems
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Designed & Engineered in TX Engineered In TX
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Shop By Application
What Are You Powering?
Home Solar & Backup
BigBattery solar LiFePO4 batteries deliver premium, high-performance energy storage for residential grid-tied systems engineered for reliability, longevity, and clean, efficient power for your home.
Off-Grid Power
BigBattery LiFePO4 batteries for off-grid solar deliver reliable and long-lasting energy storage for true energy independence.
Golf Carts & Utility
BigBattery golf cart batteries are engineered to increase performance, run times, faster charging, and reliable power with top American brands like Club Car, E-Z-GO, Yamaha & more.
RV, Van & Camper
BigBattery lithium RV batteries are lightweight, fast-charging, and built for homes that roam.
Marine & Boats
BigBattery lithium batteries deliver deep-cycle performance and high energy density, ideal for trolling motors and onboard electronics.
Industrial & Commercial
BigBattery lithium batteries for industrial equipment deliver long-lasting power ideal for scissor lift fleets, floor sweepers and C&I.
FREE SOLAR BATTERY CALCULATOR
See How Much Battery You Need
Use our free solar and battery calculator to find the right battery storage, solar array size, and system configuration for your home, cabin, or backup power setup.
Why Americans Choose BigBattery
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Best $/kWh In the USA
Premium LiFePO4 at prices that make green energy accessible. We cut out middlemen so you don't overpay.
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Universal Compatibility
Open-communication BMS integrates with virtually any setup. No proprietary lockouts by design.
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Real Experts, Texas Based
U.S. based support with fast response time. We answer the phone when you need help.
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12-Year Warranty
The longest warranty in the battery industry. 4,000+ charge cycles. We stand behind every product.
Best Sellers
1x Nexus + 1x APEX 6.5K
Starting at $4,535
or $189/mo
1x FlexBOSS18 + 2x ETHOS
Starting at $6,055
or $252/mo
Customer reviews
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My first warranty interaction with BigBattery was unexpectedly positive. I have had awful experiences in the past getting solar equipment warranty replacements from other companies. My inverter failed and I was worried about warranty replacement of an extremely heavy(165lb) inverter. Dylan at BB helped me through the entire process, description, diagnosis and replacement procedures. I was very disappointed to find out my inverter was no longer available. Dylan made me aware of this and got approval for what may be the most cost effective and modular inverters(EG4 6000xp’s). I am grateful that Dylan helped get me back off grid. Thank You Dylan and the BigBattery team for making a bad situation into positive encounter!
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I called and asked questions they had great tech help and customer service. I ended up ordering a 48 volt battery pack for my golf cart and water resistant charger kit. Was an awesome price and even better product. I have been super happy with the battery pack and not having to constantly add water to the old lead acid batteries.
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I recently installed a new system using 16 of the new BigBattery ETHOS modules and it has been working PERFECTLY... Installing the modules and controller was a breeze as everything is plug and play.
More Value. Better Performance.
| Feature | BigBattery | Typical Battery Brands |
|---|---|---|
| Warranty | 10–12 years | 1–5 years |
| Manufacturing | Designed & engineered in the USA (Texas) | Often overseas, private-labeled |
| Battery Chemistry | LiFePO4 (thermally stable) | Mix of LiFePO4 and less stable NMC lithium-ion |
| Compatibility | Open-communication BMS, works with most inverters | Often proprietary, locked to one ecosystem |
| Pricing Model | Direct-to-consumer, no dealer markup | Often sold through dealer networks |
| Support | U.S.-based team, phone/chat/email | Varies — often overseas or ticket-only |
We're here to help
Not Sure What You Need?
Whether you prefer to explore on your own or talk to a real expert — we've got you covered.
Two ways to find the right system:
Self-guided
System sizing tool
Solar Battery Sizing Calculator
- Takes under 3 minutes
- Instant recommendations
- Compare options side by side
US-based customer support
Speak to our US based experts
Speak with an Expert
- Free consultation
- No obligation quote
- Mon–Fri 8am–6pm PT
No spam, no pressure. Trusted by 50,000+ Americans since 2011.
Frequently Asked Questions
What does BigBattery sell, and who is it for?
BigBattery designs and manufactures lithium batteries, including LiFePO4 battery packs, solar batteries, and complete off grid solar systems; for homeowners, RV and van owners, boaters, golf cart owners, and industrial or commercial fleets. Whether you need a solar battery backup for your house, a full off-grid setup for a cabin, or a deep cycle lithium battery for your boat or golf cart, you'll find it in our Home Solar & Backup, Off-Grid, RV, Marine, or Golf Cart lineups.
Is BigBattery compatible with my existing solar system, inverter, or charge controller?
Yes, most BigBattery batteries use an open-communication BMS built for universal compatibility, so they work with major inverters and charge controllers like Victron, Growatt, and Schneider with no proprietary lockouts. UL-certified, grid-tied systems like NEXUS are designed to integrate directly with select hybrid inverters. If you would like more information on your specific setup, call (818) 280-3091.
What certifications does BigBattery meet?
BigBattery products are ISO 9001 certified, CEC-listed for grid-tied solar systems, and designed, and engineered in the USA. These certifications confirm manufacturing quality standards and, for CEC-listed systems, can help qualify you for state and utility solar incentive programs.
Why does BigBattery use LiFePO4 instead of other lithium chemistries?
BigBattery builds nearly every lithium battery on LiFePO4 (lithium iron phosphate) chemistry because it's the most thermally stable lithium ion battery option available, with a significantly lower risk of overheating than NMC lithium-ion. LiFePO4 also delivers 4,000+ charge cycles and a decade or more of daily use, which is why we can back every LiFePO4 battery with a 10–12 year warranty. Learn more in Battery 101.
How do I know which BigBattery system is right for me?
Start with the free Solar Battery Sizing Calculator, it takes under 3 minutes and gives you a custom lithium battery or off grid solar system recommendation based on your daily energy usage. Prefer to talk it through? Call (818) 280-3091 to speak with a U.S.-based expert, no obligation.
What warranty and support does BigBattery provide?
Every BigBattery lithium battery comes with a 10–12 year warranty — the longest in the battery industry — plus U.S.-based support by phone, live chat, and email. Full terms are on our Policies page.
Does BigBattery ship nationwide, and how fast?
Yes, BigBattery ships nationwide from our Texas manufacturing facility. Most in-stock lithium batteries and solar batteries ship within 1–3 business days. Larger systems, like a full off grid solar system kit or inverter, may ship via freight with a longer window shown at checkout.
Do I need a professional to install a BigBattery system?
It depends on the system. Drop-in batteries for golf carts, RVs, and boats are plug-and-play and don't require an electrician. Larger grid-tied or off grid solar systems involving inverters and panel wiring should be installed by a licensed electrician or solar installer. If you're not sure what your setup requires, call (818) 280-3091 and our team can walk you through it.
Have more questions? Contact us