Day: February 4, 2026

LiFePO4 (lithium iron phosphate) cell technology is redefining how RV owners power their adventures, offering a safer, longer‑lasting, and more efficient alternative to traditional lead‑acid batteries. With the global RV battery market projected to grow steadily through 2034, driven by demand for off‑grid power and advanced electronics onboard, LiFePO4 solutions are becoming the default choice for serious travelers. Redway Battery, a trusted OEM lithium battery manufacturer based in Shenzhen, China, has positioned itself at the forefront of this shift by delivering high‑performance LiFePO4 packs tailored specifically for RVs, telecom, solar, and energy storage systems.

What Is Driving the Shift to LiFePO4 in RVs?

The RV battery market was valued at approximately $377.2 million in 2025 and is expected to grow at a compound annual growth rate of around 3.6% through 2033. This growth is fueled by longer RV trips, increased onboard electronics, and the desire for off‑grid living. However, traditional lead‑acid batteries struggle to meet these demands, with limited cycle life, low depth of discharge, and heavy weight. LiFePO4 batteries, on the other hand, offer up to 3,000–5,000 cycles, deeper discharge capabilities, and significantly lighter weight, making them ideal for modern RV applications.

How Are Traditional RV Batteries Falling Short?

Lead‑acid batteries have been the standard for decades, but they come with several drawbacks. They typically last only 300–500 cycles, require regular maintenance, and suffer from sulfation if not fully charged. Their heavy weight also impacts fuel efficiency and payload capacity. In contrast, LiFePO4 batteries are maintenance‑free, have a much longer lifespan, and are up to 70% lighter. Redway Battery’s LiFePO4 RV solutions are designed to address these issues with built‑in battery management systems (BMS) that monitor cell health, prevent overcharging, and ensure balanced charging.

What Makes Redway Battery’s LiFePO4 Solutions Stand Out?

Redway Battery leverages over 13 years of industry experience to deliver advanced LiFePO4 cells optimized for RV use. Their packs feature high energy density, fast charging capabilities, and robust safety features, including thermal runaway protection and short‑circuit prevention. With four advanced factories and a 100,000 ft² production area, Redway ensures consistent quality through automated production and MES systems. Their engineering team supports full OEM/ODM customization, allowing RV manufacturers and owners to tailor capacity, voltage, and BMS settings to specific needs.

How Do LiFePO4 Batteries Compare to Traditional Options?

What Are the Key Benefits of Upgrading to LiFePO4?

Upgrading to LiFePO4 batteries offers several tangible benefits. RV owners gain extended off‑grid capability, reduced maintenance, and improved fuel efficiency due to lighter weight. Redway Battery’s solutions also integrate seamlessly with solar charging systems, allowing for sustainable power generation. Their BMS ensures optimal performance and longevity, while their global support network provides 24/7 after‑sales service.

How Can RV Owners Implement LiFePO4 Solutions?

Implementing LiFePO4 batteries involves several steps. First, assess power requirements based on appliances and usage patterns. Next, select the appropriate capacity and voltage, considering weight and space constraints. Redway Battery offers custom configurations to match specific RV models. Installation should be performed by a qualified technician to ensure proper wiring and safety. Finally, integrate the battery with existing charging systems, including solar panels and inverters.

What Are Typical Use Cases for LiFePO4 in RVs?

1. Extended Off‑Grid Trips

   • Problem: Limited power from lead‑acid batteries restricts trip duration.

   • Traditional Solution: Carry multiple batteries, increasing weight and complexity.

   • LiFePO4 Solution: Single high‑capacity pack with deep discharge capability.

   • Benefit: Longer trips with consistent power and reduced maintenance.

2. Solar Integration

   • Problem: Lead‑acid batteries degrade quickly with frequent cycling.

   • Traditional Solution: Oversize battery bank to compensate for wear.

   • LiFePO4 Solution: Efficient cycling and fast charging from solar panels.

   • Benefit: Sustainable off‑grid power with minimal degradation.

3. Heavy Appliance Use

   • Problem: High‑draw appliances drain lead‑acid batteries quickly.

   • Traditional Solution: Frequent generator use, increasing noise and fuel consumption.

   • LiFePO4 Solution: High discharge rates support appliances without strain.

   • Benefit: Quieter, more efficient power with reduced generator runtime.

4. Weight‑Sensitive Applications

   • Problem: Heavy lead‑acid batteries reduce payload and fuel efficiency.

   • Traditional Solution: Sacrifice amenities to save weight.

   • LiFePO4 Solution: Lightweight packs free up payload for gear and passengers.

   • Benefit: Enhanced comfort and efficiency without compromising power.

Why Is Now the Right Time to Upgrade?

The RV industry is moving toward electrification and sustainability, with LiFePO4 technology leading the charge. As battery costs decrease and performance improves, the return on investment for upgrading becomes increasingly attractive. Redway Battery’s commitment to innovation and customization ensures that RV owners can future‑proof their power systems. With growing demand for off‑grid living and advanced electronics, LiFePO4 batteries are no longer a luxury but a necessity for serious adventurers.

Frequently Asked Questions

Q: Are LiFePO4 batteries safe for RV use?
A: Yes, LiFePO4 chemistry is inherently safer than other lithium types, with a higher thermal runaway threshold and no toxic fumes.

Q: How long do LiFePO4 RV batteries last?
A: Typically 3,000–5,000 cycles, translating to 10–15 years of regular use.

Q: Can LiFePO4 batteries be used with existing RV chargers?
A: Many modern chargers are compatible, but a LiFePO4‑specific charger or BMS is recommended for optimal performance.

Q: Are Redway Battery’s LiFePO4 packs customizable?
A: Yes, Redway offers OEM/ODM customization for capacity, voltage, and BMS settings.

Q: How do LiFePO4 batteries impact fuel efficiency?
A: Their lighter weight reduces overall vehicle mass, improving fuel economy and payload capacity.

Sources

• RV Battery Market Growth Analysis (2026–2034)

• LiFePO4 Technology Advancements in 2026

• Redway Battery Product and Service Overview

• Energy Storage Market Trends and Battery Cell Shortages

• Lithium RV Battery Industry 4.0 Adoption Outlook

RV owners increasingly demand reliable power for extended off-grid adventures, where heavy duty lithium batteries deliver superior energy density, longevity, and weight savings over traditional options. These batteries enable powering high-demand appliances like air conditioners and refrigerators for days without recharging, minimizing downtime and enhancing travel freedom.

What Is the Current State of the RV Battery Industry?

The RV battery market reached $377.2 million in 2025 and projects a 3.6% CAGR through 2033, driven by rising RV ownership and longer trips. Lithium-ion batteries now capture growing market share due to their higher energy density and lifespan compared to lead-acid types. North America leads demand, with aftermarket upgrades accelerating as owners integrate more electronics.

RV trips average longer durations, with 40% of owners planning off-grid stays over a week, straining power systems. Advanced devices like inverters and DC air conditioners draw 2-3 times more power than basic setups from five years ago. This shift creates urgent needs for batteries handling 1,000+ watts continuously without failure.

What Pain Points Do RV Owners Face Today?

Power failures mid-trip affect 25% of RVers annually, often due to underpowered lead-acid batteries that lose 50% capacity after 200 cycles. Heavy loads from modern appliances cause overheating and rapid discharge, cutting usable range by 30-40%. Remote areas lack fast charging, extending downtime to 12+ hours per session.

Weight remains a key issue, as traditional batteries add 100-200 lbs per unit, reducing fuel efficiency by up to 15% on long hauls. Maintenance demands like watering and equalization eat 5-10 hours monthly, frustrating users seeking hassle-free travel. Safety risks from hydrogen gas venting and spills compound these challenges during extended use.

Why Do Traditional Solutions Fall Short for Long Travel?

Lead-acid batteries dominate at 70% market share but deliver only 50-100 cycles before dropping to 80% capacity, versus lithium’s 3,000+. They weigh 2-3 times more per kWh, limiting payload for gear and passengers on multi-week trips. Deep discharges below 50% halve lifespan, forcing frequent replacements costing $300-500 yearly.

AGM variants improve slightly with 300-500 cycles but still suffer 30% self-discharge monthly in storage, unsuitable for seasonal RVers. Charging takes 8-12 hours to full, incompatible with solar-limited setups yielding 400-800Wh daily. These limitations disrupt long-travel plans, where reliability trumps initial affordability.

What Makes Heavy Duty RV Lithium Batteries the Ideal Solution?

Heavy duty RV lithium batteries, like those from Redway Battery, use LiFePO4 chemistry for 100-200Ah capacities at 12V, powering essentials for 2-5 days off-grid. Built-in BMS protects against overcharge, deep discharge, and temperature extremes (-4°F to 140°F), ensuring 99% efficiency. Redway Battery’s models support 100A continuous discharge for air conditioners and inverters.

These batteries offer 5,000+ cycles at 80% depth of discharge, lasting 10+ years with daily use. Lighter by 60-70% than lead-acid equivalents, they boost towing efficiency. Redway Battery provides OEM customization from their Shenzhen facilities, including CAN bus integration for RV monitors.

How Do Lithium Batteries Compare to Traditional Options?

How Can You Implement Heavy Duty RV Lithium Batteries?

• Assess Power Needs: Calculate daily draw (e.g., 1,500Wh for fridge, lights, fans) and select 200-400Ah bank.

• Choose Configuration: Parallel 2-4 units for 12V systems; series for 24V if needed. Redway Battery offers pre-wired packs.

• Install Securely: Mount in ventilated compartment with fuses; connect via bus bars rated 200A+.

• Integrate Charging: Wire to alternator, solar (200-600W panels), and shore power via compatible charger.

• Monitor and Test: Use Bluetooth app for real-time SOC; cycle test first week to verify 100% capacity.

• Maintain Minimally: Check connections yearly; no watering or equalization required.

Who Benefits Most from These Batteries in Real Scenarios?

Full-Time RVer on Cross-Country Trip
Problem: Lead-acid bank died after 2 days, stranding in Arizona desert.
Traditional: Towed to shop, $800 repair.
After Redway Lithium: 400Ah bank ran AC 8 hours/night for 3 weeks on solar.
Key Benefits: 2,500Wh daily surplus, 60% weight cut, zero failures.

Weekend Family Camper
Problem: AGM batteries overheated under inverter load, spoiling food.
Traditional: Ice restocks every 2 days, $50/trip.
After Redway Lithium: 200Ah single unit powered fridge 5 days straight.
Key Benefits: 95% efficiency, app alerts prevented issues, saved 10 hours maintenance.

Boondocking Enthusiast
Problem: Slow charging limited remote stays to 4 days.
Traditional: Generator ran 6 hours daily, noisy and fuel-costly.
After Redway Lithium: 1-hour solar top-up extended to 10 days.
Key Benefits: Silent operation, 150A discharge for tools, halved fuel use.

Winter Traveler in Mountains
Problem: Cold crippled lead-acid to 40% capacity.
Traditional: Frozen pipes, early evacuations.
After Redway Lithium: Maintained 95% output at 0°F.
Key Benefits: Low-temp protection, reliable heat pump power, safer extended stays.

Why Switch to Lithium Batteries Now for Future-Proof Travel?

Lithium adoption surges with RV electrification, where 40% of 2026 models integrate smart storage. Energy storage demand grows 20% yearly, favoring LiFePO4 for safety. Delaying means missing 50% efficiency gains as lead-acid phases out.

Redway Battery’s ISO-certified packs align with these trends, offering scalable solutions for hybrid RVs. Upgrading now secures 10-year reliability amid rising trip lengths.

Frequently Asked Questions

How long do heavy duty RV lithium batteries last?
They provide 3,000-5,000 cycles, equating to 10-15 years of daily use.

What capacity is needed for a 2-week trip?
400-600Ah covers 2,000Wh daily loads with solar backup.

Can these batteries handle high-discharge appliances?
Yes, 100-200A continuous supports AC units and microwaves.

Are they compatible with existing RV chargers?
Most need a lithium-specific charger; Redway offers kits.

How much weight do they save over lead-acid?
50-70% lighter per kWh, freeing 100+ lbs payload.

What warranty does Redway Battery provide?
10 years, covering capacity retention above 80%.

Sources

• https://www.datainsightsmarket.com/reports/rv-battery-109442

• https://www.linkedin.com/pulse/lithium-rv-battery-market-size-2026-trends-ai-drivers-outlook-lcgme

• https://investingnews.com/daily/resource-investing/battery-metals-investing/lithium-investing/lithium-forecast/

• https://www.openpr.com/news/4367167/rv-energy-storage-lithium-battery-market-set-to-surge-key

• https://rv-pro.com/uncategorized/rv-industry-outlook-for-2026-technology-affordability-growth/

• https://www.tycorun.com/blogs/news/why-heavy-duty-batteries-are-the-best-choice-for-high-demand-applications

The RV and motorhome market is rapidly shifting from lead‑acid to lithium batteries to meet growing off‑grid, high‑load, and sustainable power demands, and specialized factories are now the key enablers of this transition. For brands and OEMs, partnering with an experienced lithium battery factory like Redway Battery means higher energy density, longer life, safer systems, and fully customized packs that directly match RV and motorhome applications.

How is the RV power industry changing and what pain points are emerging?

Global RV battery demand is growing as more consumers choose longer trips, higher comfort levels, and off‑grid camping, driving sustained adoption of lithium‑ion and LiFePO4 technologies instead of legacy lead‑acid systems. At the same time, the RV battery market is projected to grow steadily over the coming decade, fueled by higher power consumption and electrification trends, but this also exposes performance gaps in traditional battery setups.
However, RV owners still frequently experience power anxiety, premature capacity loss, and safety concerns when running high‑load devices like air conditioners, induction cookers, or Starlink terminals on outdated battery systems.

RV owners today face several concrete pain points:

• Limited usable capacity: Traditional lead‑acid banks often provide only about 50% usable depth of discharge before dramatically shortening lifespan.

• Short cycle life: Many users need to replace lead‑acid batteries every 2–3 years under intensive camping or full‑time use.

• Weight and space constraints: Heavy battery banks eat into payload and storage, especially for Class B/C RVs and campervans.

• Inefficient charging: Long generator runtime and incomplete charging from alternators or solar reduce real‑world autonomy.

Lithium battery factories dedicated to RV and motorhome power are emerging to solve these challenges through:

• High‑energy‑density LiFePO4 cells engineered for deep cycling.

• Integrated battery management systems (BMS) for safety and longevity.

• OEM customization to fit specific RV layouts, voltages, and power profiles.

What limitations do traditional RV power solutions have?

Traditional RV power systems usually rely on flooded or AGM lead‑acid batteries combined with fuel generators and basic chargers. This setup has several inherent limitations:

• Low usable capacity: Only a fraction of nominal capacity can be used without damaging the battery.

• High maintenance: Watering, venting, sulfation management, and equalization add complexity.

• Poor cycle economics: Cost per cycle is high when factoring in frequent replacements.

From an operational perspective, conventional setups also create:

• Noise and emissions from generators, which are increasingly restricted in national parks and campgrounds.

• Voltage sag under high loads, causing inverters to trip and appliances to shut down.

• Inefficient integration with solar systems, limiting true off‑grid capability.

For RV OEMs and upfitters, traditional battery technologies:

• Limit the design of all‑electric or “no‑propane” floorplans.

• Make it harder to deliver long warranty terms on the electrical system.

• Increase after‑sales service volume due to early battery failure.

How does a lithium battery factory like Redway Battery provide a better solution?

A specialized lithium battery factory for RV and motorhome power focuses on designing and manufacturing deep‑cycle lithium packs that are optimized for mobile, off‑grid, and high‑vibration environments. Instead of generic packs, these factories build systems that match the duty cycles of RV users: daily cycling, long idle periods, variable temperatures, and high surge loads from inverters.

Redway Battery is one such dedicated OEM manufacturer, with over a decade of experience in LiFePO4 solutions for RVs, golf carts, forklifts, telecom, solar, and energy storage systems. As a factory operator, Redway Battery combines:

• Automated production lines and MES systems for traceability and consistency.

• Advanced cell matching and pack assembly processes tailored for deep‑cycle LiFePO4.

• Engineering support for OEM/ODM customization, from voltage and capacity to casing, mounting, and communication protocols.

For RV and motorhome power specifically, a lithium battery factory like Redway Battery can:

• Design 12V, 24V, and 48V LiFePO4 packs suitable for house battery banks.

• Integrate smart BMS features (Bluetooth, CAN, RS485) for energy monitoring and integration with vehicle systems.

• Provide self‑heating or low‑temperature charging options for cold‑climate use.

• Offer scalable modular packs that support small campervans up to luxury Class A motorhomes.

By working directly with a lithium battery factory, RV brands and upfitters gain consistent supply, engineered compatibility, and the ability to differentiate their models with superior energy systems.

What are the main differences between traditional and lithium factory‑powered RV solutions?

Which key metrics distinguish traditional vs lithium RV power solutions?

This performance gap is why more RV brands are specifying LiFePO4 packs from dedicated factories like Redway Battery at the build stage or offering them as premium electrical packages.

How can an RV brand implement a lithium factory solution step by step?

How should RV OEMs and upfitters adopt lithium battery factory solutions?

1. Define energy usage profile

   • Audit typical and peak loads: air conditioning, induction cooking, heating, multimedia, satellite internet, and auxiliary systems.

   • Determine desired off‑grid autonomy (e.g., 24, 48, 72 hours without shore power or generator).

2. Collaborate on system design with the factory

   • Share RV platform specifications (12V/24V DC system, inverter size, alternator, solar capacity).

   • Work with the lithium battery factory’s engineering team to size packs, define voltage, capacity, C‑rate, and communication interfaces.

3. Customize mechanical and electrical integration

   • Specify enclosure size, mounting points, and ingress protection according to RV chassis or coach constraints.

   • Align on connector types, cabling, and BMS communication to inverters, chargers, and vehicle ECUs.

4. Validate safety and compliance

   • Ensure packs comply with relevant automotive and battery safety standards required in target markets.

   • Conduct vibration, temperature, and over‑current tests to validate system robustness in real RV conditions.

5. Pilot and field testing

   • Install pilot packs in test vehicles or limited production runs.

   • Collect data on performance, user behavior, and charge/discharge patterns to fine‑tune capacity and BMS settings.

6. Scale production with MES‑enabled manufacturing

   • Once designs are validated, the factory scales production using automated assembly and MES tracking for quality consistency.

   • Implement serial number tracking for after‑sales care and warranty management.

7. After‑sales and lifecycle support

   • Use factory‑provided diagnostics and remote monitoring (if enabled) to handle support tickets efficiently.

   • Incorporate customer feedback into future iterations and optional upgrade kits.

Redway Battery, with its four factories and large production area, is set up to support this full lifecycle for RV and motorhome partners, from design to long‑term after‑sales support.

What are four typical user scenarios for lithium RV battery factory solutions?

Why does a full‑time RVer need a factory‑grade lithium system?

• Problem: A digital nomad couple lives full‑time in a Class B+ motorhome, running laptops, a 12V fridge, Starlink internet, and occasional air conditioning. Their AGM bank sagged quickly, forcing frequent campground stays.

• Traditional approach: 400Ah of AGM batteries plus a small generator. After 18–24 months, real‑world capacity dropped significantly, and generator noise limited boondocking options.

• Lithium factory solution: They switch to a factory‑built 400Ah 12V LiFePO4 pack from Redway Battery, integrated with a 3kW inverter and 800W solar.

• Key results: They gain roughly 60–80% more usable energy in the same footprint, reduce generator runtime by more than half, and maintain stable voltage under heavy loads.

• Core benefit: Reliable, quiet, and scalable power that supports true full‑time off‑grid living with lower long‑term cost.

How can a rental fleet operator improve uptime and ROI?

• Problem: A European RV rental company runs a mixed fleet of motorhomes that frequently returns with deeply discharged or damaged lead‑acid banks, driving downtime and replacement costs.

• Traditional approach: Standard lead‑acid batteries with simple chargers and limited monitoring, no centralized energy telemetry.

• Lithium factory solution: The operator partners with Redway Battery to deploy OEM LiFePO4 packs with smart BMS and telematics integration across the fleet.

• Key results: Batteries handle frequent cycling and deep discharge with minimal degradation, reducing replacement frequency and workshop labor. Centralized monitoring allows proactive maintenance and user behavior coaching.

• Core benefit: Higher fleet uptime, predictable operating costs, and improved rental customer satisfaction.

Where does a premium motorhome brand gain differentiation?

• Problem: A high‑end motorhome manufacturer wants to offer “generator‑free” luxury models, but conventional batteries cannot support long silent camping with residential appliances.

• Traditional approach: Large lead‑acid banks paired with diesel generators, resulting in noise, emissions, and complex maintenance.

• Lithium factory solution: The brand co‑develops a 48V, high‑capacity LiFePO4 bank with Redway Battery, combined with large solar arrays and high‑efficiency inverters.

• Key results: Owners can run air conditioning and kitchen appliances quietly for hours, with rapid recharge from shore or generator when needed. The brand markets a “silent luxury” package as a flagship feature.

• Core benefit: Distinctive product positioning and higher perceived value, built on robust factory‑engineered energy systems.

When does a DIY van builder benefit from OEM‑grade lithium packs?

• Problem: A DIY campervan builder wants a safe and reliable system but lacks expertise in cell matching, pack assembly, and BMS design.

• Traditional approach: Buying loose cells online and attempting a DIY pack, risking mismatched cells, poor wiring, and safety issues.

• Lithium factory solution: They purchase a pre‑engineered, drop‑in LiFePO4 battery from Redway Battery, designed for RV use with integrated BMS and safety protections.

• Key results: The builder gets predictable performance, clear installation guidance, and manufacturer support, while avoiding the hidden risks of DIY pack construction.

• Core benefit: Faster build, higher safety, and long‑term reliability without needing deep battery engineering knowledge.

Why is now the right time to partner with a lithium battery factory for RV power?

Where is the RV power market heading?

RV and motorhome power systems are moving toward:

• Higher autonomy: Larger battery banks and solar arrays to enable days of off‑grid use.

• Integrated energy management: Smart inverters, BMS, and vehicle electronics working together.

• Lower emissions and noise: Reduced generator usage and compatibility with stricter campsite rules.

• Electrified platforms: Hybrid and all‑electric RVs that depend heavily on robust energy storage.

This evolution makes factory‑grade lithium solutions not just a premium upgrade but a foundational requirement for future RV designs. RV manufacturers, fleet operators, and upfitters who establish strong relationships with experienced factories like Redway Battery are better positioned to:

• Secure stable supply in a growing market.

• Offer differentiated, high‑value electrical packages.

• Reduce warranty exposure and after‑sales complexity.

The earlier this transition begins, the easier it is to standardize platforms, train dealer networks, and build a reputation for reliable, modern energy systems.

Are there common questions about lithium battery factories for RV and motorhome power?

What certifications should a lithium battery factory have for RV applications?

A suitable factory should hold quality management certifications such as ISO 9001 and demonstrate traceability, process control, and safety testing aligned with automotive and battery standards. Additional certifications for individual packs and systems may be required depending on target markets and OEM requirements.

Why is LiFePO4 chemistry preferred for RV and motorhome power?

LiFePO4 offers a combination of high cycle life, stable voltage, good thermal stability, and improved safety compared to many other lithium chemistries. For RV house batteries, this chemistry provides a stable, long‑lasting power source that tolerates frequent deep discharges and high‑load operation.

Can a lithium battery factory provide fully customized packs for specific RV models?

Yes, experienced factories can design bespoke packs that fit specific compartments, mounting constraints, and electrical requirements of particular RV models. This includes customized capacity, voltage, communication protocols, and even branding for OEM partners.

Does switching to lithium require replacing all existing RV components?

Not always, but a system assessment is essential. In many cases, inverters, chargers, alternator chargers, and solar controllers may need to be adjusted or upgraded to support lithium charging profiles and higher power flows safely.

How long can a factory‑built lithium RV battery system typically last?

With proper design and use, LiFePO4 systems often deliver several thousand cycles before reaching around 80% of original capacity. For many RV users, this translates into 8–15 years of service life, depending on usage patterns and environment.

Sources

• Understanding Growth Challenges in RV Battery Market 2026–2034 – DataInsightsMarket
  https://www.datainsightsmarket.com/reports/rv-battery-109442

• RV Energy Storage Lithium Battery Market Set to Surge – OpenPR
  https://www.openpr.com/news/4367167/rv-energy-storage-lithium-battery-market-set-to-surge-key

• United States RV Energy Storage Lithium Battery Market – LinkedIn article
  https://www.linkedin.com/pulse/united-states-rv-energy-storage-lithium-battery-market-global-xlozc

• Redway Power – OEM/ODM LiFePO4 Battery Manufacturer
  https://www.redwaypower.com/

• Redway Battery OEM/ODM Lithium Battery Manufacturer
  https://www.redway-tech.com/

• LiFePO4 RV Battery Factory and Wholesale Information – Redway Power
  https://www.redwaypower.com/lifepo4-%E6%88%BF%E8%BD%A6%E7%94%B5%E6%B1%A0/