FLLYROWER 12V 100Ah LiFePO4 Battery review

?Are we looking for a reliable, long-lasting battery to power our trolling motor, RV adventures, golf cart, or solar setup?

Overview of the FLLYROWER 12V 100AH Lifepo4 Battery with 100A BMS 10-Year Lifespan for Trolling Motor RV Camping Golf Cart Solar Include a Charger

We’ve tested and considered many batteries, and this FLLYROWER 12V 100AH LiFePO4 unit stands out for its combination of cycle life, built-in protections, and versatility. It promises deep cycle capability with an exceptionally high cycle count, grade A cells, series/parallel expansion options, and a 100A battery management system (BMS). The seller also includes a charger, which makes initial setup simpler for many of us.

Key Specifications

Below we summarize the main specs in a table for quick reference. These are the manufacturer-provided highlights that matter most when choosing a battery for mobile and stationary applications.

Capacity and Chemistry

We appreciate that this is a 100Ah LiFePO4 battery. The LiFePO4 chemistry gives us stable voltage, relatively low self-discharge, and inherently better thermal and chemical stability than many other lithium chemistries. With 100Ah at nominal 12.8V, we get about 1280 Wh of usable energy per battery when fully charged, and because LiFePO4 tolerates deeper discharge, we can access a larger portion of that capacity safely compared with lead-acid options.

Cycle Life and Lifespan

The manufacturer claims about 18,500 cycles and a 10-year lifespan if maintained properly. Those are impressive numbers. In real-world terms, this means we can expect years of frequent use without needing replacement — far outpacing traditional lead-acid batteries that might only manage a few hundred cycles. Of course, actual cycle life depends on depth of discharge, temperature, charge rates, and storage conditions, but the potential longevity here is a major selling point.

BMS Features

The battery comes with a 100A BMS that offers a comprehensive set of protections. We like that it includes:

• Overcharge protection
• Overdischarge protection
• Overcurrent protection
• Short circuit protection
• High-temperature protection
• Low-temperature protection (automatic cut-off in cold conditions)
• Overheat protection

Low-temperature protection is especially useful for winter use, because it prevents charging when the battery is too cold — a condition that can harm LiFePO4 cells. The BMS also helps balance cells and prolong overall pack life.

Cells and Build Quality

This product uses Grade A cells, which is a good sign for consistency and durability. Grade A cells typically offer better capacity retention, lower internal resistance, and more consistent performance across the pack. The manufacturer also notes that these batteries can be connected in series and parallel, which implies consistent cell matching and a capable BMS design. If we want cell-level specifications or to learn about the factory production environment, the seller invites contact by email.

Series and Parallel Connections

One of the battery’s strengths is flexibility in system design. We can:

• Connect up to five of these batteries in series to reach higher voltages (for example, 5 × 12.8V ≈ 64V systems).
• Connect an unlimited number in parallel for increased capacity, practically without a stated limit from the manufacturer.

That flexibility makes it suitable for modular installations — from a single battery for a trolling motor to multi-battery banks for off-grid or RV power systems. When wiring multiple batteries, we emphasize using proper cabling, fusing, and BMS communication where necessary.

Included Charger and Accessories

The battery listing includes a charger, which simplifies the initial setup. While the charger is a welcome addition, we recommend verifying charger specifications (output voltage, current limits, and LiFePO4 compatibility) before relying on it as the long-term charging solution. For larger systems or solar integration, we may prefer a dedicated LiFePO4-compatible solar charge controller or DC charger with programmable settings.

Performance and Use Cases

This battery targets multiple uses. We’ll cover likely scenarios and how the battery fits into each.

Trolling Motor and Marine Use

For trolling motors, we value high cycle life and robust discharge capability. The 100A BMS provides a healthy discharge ceiling for many trolling motors, and LiFePO4’s stable voltage helps motors run more consistently. The resistance to deep discharge also means we can use more of the battery’s capacity without fear of shortening its life significantly. Remember to protect exposed terminals from corrosion in marine environments and mount the battery securely.

RV and Camping

In RV and camping scenarios, this battery shines. It provides reliable power for lights, refrigeration, fans, and charging electronics. Because LiFePO4 is lighter and more compact for the same usable capacity than flooded lead-acid, we reduce weight and gain usable energy. We should ensure our RV charging system, converter, or solar controller is LiFePO4-compatible or can be adjusted to support a LiFePO4 charging profile.

Golf Cart and Lawn Mower

For golf carts and motorized lawn equipment, the 100A continuous BMS rating helps with moderate to heavy loads. If our cart draws higher peak currents, we should confirm peaks against the BMS rating and consider paralleling batteries for higher sustained currents. The longer lifespan and lower maintenance compared to lead-acid battery banks will likely reduce total ownership cost.

Solar and Home Energy Storage

As part of a solar or home energy storage system, the ability to connect multiple batteries in series or parallel makes this a modular option. The long cycle life and 10-year expected lifespan make it attractive for small off-grid cabins, backup power, or grid-tied battery banks. We’ll want to pair the battery with a solar charge controller and inverter that support LiFePO4 charging parameters.

Off-grid Systems

In off-grid systems, reliability and longevity are critical. Since these batteries tolerate deep cycling and claim thousands of cycles, we can count on them for daily discharge/charge cycles without frequent replacements. The BMS protections, especially against over-discharge and temperature extremes, help prevent catastrophic failures.

Installation and Setup

We’ll cover practical steps and recommendations for safe, reliable installation.

Mounting and Ventilation

We should mount the battery on a flat, secure surface using non-conductive mounting brackets if possible. LiFePO4 batteries generate minimal off-gassing compared with lead-acid, but we still want adequate ventilation and protection from direct exposure to weather and excessive heat. Avoid placing the battery directly on bare metal that may corrode, and use suitable insulation if mounting in cold environments.

Wiring Series and Parallel

When wiring batteries in series or parallel, the following best practices will help protect the batteries and our system:

• Use cables sized for the maximum current with minimal voltage drop.
• Install appropriate fuses or circuit breakers near the battery positive terminal.
• Ensure all batteries are at similar state of charge before paralleling them.
• Prefer using the same model and age of batteries for large banks to ensure balance and even wear.
• For series connections, ensure the BMS or battery management strategy supports series balance.

We should be cautious: series connections increase voltage and require inverters and chargers rated for the higher voltage. Parallel connections increase capacity; ensure BMS and wiring can handle the increased current.

Charger Selection and Settings

Although a charger is included, we recommend verifying or using a dedicated LiFePO4 charger or a charger with a LiFePO4 setting. Key charging parameters to confirm:

• Float voltage: LiFePO4 typically doesn’t need float charging like lead-acid; some controllers allow a float near full charge but keep it low.
• Bulk/absorption voltage: around 14.2–14.6V for a 12V LiFePO4 pack is common — check manufacturer recommendations.
• Charging current: for a 100Ah battery, a 0.2C (20A) to 0.5C (50A) charge rate is reasonable for regular charging; higher currents are possible but check heat and BMS limits.
• Temperature compensation: LiFePO4 does not typically require temperature-compensated charging like lead-acid, but charging should be prevented below freezing if the battery or cells are cold.

Temperature Considerations

We like that the BMS includes low-temperature protection to prevent charging at low temps, which protects cell chemistry. For cold climates, heating solutions or insulated enclosures help maintain battery temperature. For hot climates, keep the battery shaded and ventilated to avoid prolonged exposure to high ambient temperatures that could accelerate aging.

Maintenance and Longevity

We want this battery to last its expected lifespan. Here’s how we keep it healthy.

Charging Best Practices

• Avoid leaving the battery at extremely low states of charge for long periods.
• Use a proper LiFePO4-compatible charger or charger settings.
• Avoid overcurrent charging beyond BMS limits.
• Periodically top off the battery if it sits unused to prevent prolonged deep discharge.

Storage Recommendations

• Store at around 40–60% state of charge for long-term storage.
• Keep in a cool, dry place — moderate temperatures prolong life.
• Check state of charge every few months and recharge if it has fallen significantly.
• Avoid storing at full charge at high temperatures, which can hasten capacity loss over time.

Winter Use and Low-Temperature Protection

Because the BMS prevents charging below a certain temperature, we must be mindful that the battery may not accept charge during cold spells. If we need to charge in cold weather, consider a battery heater or an insulated box with a small heater to bring the battery above the minimum charge temperature. Discharging at low temperatures is usually allowed but can reduce effective capacity temporarily until the battery warms.

Safety and Protections

Safety is a key reason to choose LiFePO4 chemistry. The battery’s BMS provides multiple protections that lower the risk of cell damage and unsafe conditions. We still follow standard battery safety:

• Use fuses or breakers on the positive lead.
• Secure terminals and use corrosion-resistant connections.
• Avoid short circuits and ensure wiring is properly insulated.
• Replace any battery that shows swelling, leak, or severe damage.
• Follow local regulations for disposal or recycling.

Comparison: LiFePO4 vs Lead-Acid

We often get customers asking why they should switch from lead-acid. Summarizing:

• Cycle Life: LiFePO4 vastly outlives lead-acid (thousands vs hundreds of cycles).
• Depth of Discharge: LiFePO4 can typically discharge deeper without harm, giving more usable energy.
• Weight: LiFePO4 batteries are lighter for the same usable capacity.
• Maintenance: LiFePO4 requires little to no maintenance (no watering).
• Cost: Upfront cost is higher for LiFePO4, but total cost of ownership can be lower due to longevity and performance.
• Safety: LiFePO4 is thermally stable and safer than some other lithium chemistries; still, lead-acid has its own failure modes and requires ventilation to manage hydrogen in flooded types.

Pros and Cons

Here are our key takeaways in terms of strengths and potential limitations.

Pros:

• Very high cycle life and long expected lifespan.
• Grade A cells for consistent performance.
• Comprehensive BMS offering many protective features.
• Flexible series and parallel connection options.
• Included charger simplifies initial setup.
• Wide application suitability (marine, RV, solar, carts).
• Lower maintenance and lighter weight compared with lead-acid.

Cons:

• Upfront cost will be higher than comparable lead-acid batteries.
• Charger included may not meet all advanced system needs; a dedicated LiFePO4 charger or controller may be preferred.
• Charging at low temperatures is prevented by the BMS; we may need heating solutions for very cold environments.
• For very high-current applications, paralleling may be necessary and requires attention to wiring and balancing.

Troubleshooting Common Issues

We’ve compiled common scenarios and practical steps to address them.

Problem: Battery won’t charge in cold weather.

• Likely cause: BMS low-temperature cut-off.
• Solution: Move the battery to a warmer place or use a heater/enclosure to raise temperature above BMS threshold before charging.

Problem: Charger not compatible (won’t reach correct voltage).

• Likely cause: Charger designed for lead-acid with different voltage targets.
• Solution: Use or program a charger/solar controller for LiFePO4 charging profile (bulk/absorption around 14.2–14.6V for 12V packs).

Problem: Unexpected early shutdown or reduced runtime.

• Likely cause: BMS overcurrent or overdischarge protection engaging; or battery not fully charged.
• Solution: Check loads, measure voltage under load, ensure the battery is charged, and confirm cable connections and fuses are sized properly.

Problem: Paralleled batteries not sharing load equally.

• Likely cause: Batteries at different states of charge or differing internal resistances/ages.
• Solution: Equalize state of charge before connecting, use same model/age batteries, and consider using busbars and matched wiring lengths to balance currents.

Frequently Asked Questions (FAQ)

We anticipate several common questions and answer them succinctly.

Q: Can we replace multiple lead-acid batteries with this single LiFePO4 unit? A: Yes, in many cases a single 100Ah LiFePO4 battery can replace larger lead-acid banks because of deeper usable capacity and lower recommended depth-of-discharge. Compare usable watt-hours rather than amp-hours alone when converting.

Q: Is the included charger sufficient for all uses? A: The included charger is useful for initial setup, but for long-term use, especially in solar or RV systems, we recommend using a LiFePO4-compatible charger or programmable charge controller to optimize performance and lifespan.

Q: Can we connect five batteries in series to make a higher-voltage bank? A: The manufacturer states up to five in series is supported. That gives higher system voltages, but we must ensure all system components (inverter, charger, BMS architecture) are rated for the higher voltage and that cell balancing is adequate.

Q: Is the battery safe to use indoors? A: Yes, LiFePO4 produces minimal off-gassing and is safer than flooded lead-acid in many indoor settings. Still, adhere to standard electrical and fire safety practices and local codes.

Q: What happens if we exceed the 100A BMS limit? A: The BMS is designed to protect the battery. If current exceeds the BMS rating, it may cut output or trigger protection. For consistently higher currents, parallel batteries or batteries with higher-rated BMS are recommended.

Final Verdict

We find the FLLYROWER 12V 100AH LiFePO4 Battery with 100A BMS and an included charger to be a compelling option for anyone seeking long-term, low-maintenance power for mobile and stationary applications. The combination of Grade A cells, extensive BMS protections, and a very high cycle life makes it an efficient, durable replacement for lead-acid systems. Its flexibility for series and parallel configurations broadens its usefulness across marine, RV, golf cart, solar, and off-grid use cases.

If we prioritize longevity, lighter weight, and greater usable capacity — and if we’re prepared to match charging equipment and installation to LiFePO4 best practices — this battery is a solid choice. For very high current draws or extremely cold environments, we’d plan system design accordingly (parallel batteries or heating/enclosures) to get the best performance and lifespan.

If you’d like, we can help plan a wiring diagram for a specific application (trolling motor, RV house bank, or a small solar array), recommend chargers or inverters compatible with LiFePO4 chemistry, or walk through steps to wire batteries in series/parallel safely.

Disclosure: As an Amazon Associate, I earn from qualifying purchases.