RELiON RB80 12V 80Ah LiFePO4 Battery review

Table of Contents

Product overview

We’ll lay out what this battery is and why it stands out in the LiFePO4 category. The RELiON RB80 is a 12V, 80Ah LiFePO4 battery in a Group 27 footprint designed for marine, RV, solar, and other mobile/off-grid applications. It promises a long cycle life, IP67 waterproofing, and a 10-year warranty, which together make it compelling for those who want dependable, maintenance-light power.

What the name tells us

We like to break down product names for clarity. The full model name tells us the chemistry (LiFePO4), voltage and capacity (12V 80Ah), physical group size (Group 27), lifecycle range (3500–5000 cycles), ingress protection (IP67), and warranty length (10 years). That’s a lot packed into a single line, and it signals a battery aimed at demanding outdoor and mobile use.

Key selling points in plain terms

We trust straightforward claims, so we focus on the ones RELiON emphasizes: lightweight compared to lead-acid, far longer cycle life, full usable capacity (no 50% rule), waterproof to IP67, eco-friendly operation (no gassing), and a 10-year warranty. Those claims align with what we’d want from a modern LiFePO4 battery for boats, RVs, and solar systems.

Key specifications and quick reference

We’ll summarize the most important specs in an easy-to-read format. This helps us quickly compare and decide if the RB80 fits our needs.

Spec / Feature	Value / Note
Chemistry	LiFePO4 (Lithium Iron Phosphate)
Nominal Voltage	12V
Capacity	80Ah (960 Wh nominal)
Usable Capacity	~100% of rated capacity (about 960 Wh)
Cycle Life	3,500 to 5,000 cycles to ~80% capacity (manufacturer range)
Weight	Significantly lighter than comparable lead-acid (typically ~half the weight); check exact spec for model
Group Size	Group 27
Ingress Protection	IP67 (dust-tight, can resist 30 minutes submerged at 1 meter)
Warranty	10 years
Typical Uses	Boat, kayak, trolling motor, RV, solar, off-grid, backup
Safety/Environment	No gassing, low pollution, safer thermal profile than many other lithium chemistries

We find this table useful because it condenses the essentials and gives us a baseline for decisions about installation, pairing, and charging.

Performance and usable capacity

We’ll explain how this battery performs in real-world use and why usable capacity matters. One of the strongest points of LiFePO4 is that the rated capacity is largely usable; we don’t have to treat it like lead-acid where we only use half to preserve life.

Real usable energy

We appreciate that an 80Ah 12V battery provides roughly 960 watt-hours (Wh) of energy — 12V × 80Ah = 960Wh. Since LiFePO4 chemistry allows nearly 100% depth of discharge safely, we can expect to use most of that 960Wh without severely shortening the cycle life when managed properly. That makes system sizing easier and often lets us carry a smaller, lighter battery bank for the same usable energy compared with lead-acid.

Example runtimes for common loads

We like concrete examples to set expectations. The following table gives approximate runtimes using the full usable capacity (real-world results will vary with age, temperature, and efficiency losses):

Load	Power (W)	Approx. Runtime from 960Wh
LED cabin lights + small electronics	50 W	~19 hours
Small 12V refrigerator (compressor)	60–100 W	~9.6–16 hours
Fishfinder/GPS + livewell pump	40–80 W	~12–24 hours
200W trolling motor (moderate throttle)	200 W	~4.8 hours
500W inverter load (AC device)	500 W	~1.9 hours
1000W inverter load	1000 W	~0.9 hours

We include these to make system planning easier. If we’re using an inverter, we should account for conversion losses (~10–15%), which will reduce runtime a bit.

Cycle life and long-term value

We’ll examine longevity and what the 3,500–5,000 cycle claim means for us. Cycle life is where LiFePO4 really outshines lead-acid in total lifecycle cost.

What 3,500–5,000 cycles means

We’re impressed by the 3,500–5,000 cycle range as it suggests years of service even with daily use. If we cycled the battery once per day, 3,500 cycles would be roughly 9.5 years; 5,000 cycles would be over 13 years. Because RELiON offers a 10-year warranty, they’re effectively aligning their product expectations with long-term confidence in its performance.

Capacity retention over time

We like that RELiON states the battery still provides about 80% of rated capacity after 3,500 cycles. In practice, that means we’ll retain meaningful capacity deep into the battery’s lifespan, and the gradual degradation will be much slower than lead-acid where sulfation and plate wear reduce usable capacity much faster.

Weight and portability

We’ll compare the RB80’s weight advantages and why that matters for boats and portable systems. One of the reasons to choose LiFePO4 is reduced weight without sacrificing energy.

How weight affects performance

We find weight important for marine craft and kayaks where every pound affects draft, speed, and handling. RELiON claims lithium batteries are typically half the weight of equivalent lead-acid units. That translates into better agility on the water, easier installation and transport, and often reduced stress on mounting systems.

Practical considerations

We recommend checking the exact weight in the product specification sheet before ordering, because “Group 27” form factor weights vary. In general, we expect the RB80 to be in a comfortable weight range for one to two people to carry, unlike many lead-acid batteries that require more manpower or rigging to move safely.

Waterproofing and ruggedness

We’ll cover the IP67 rating and what it means for marine and outdoor use. Rugged ingress protection is essential for batteries that live outside or near water.

Understanding IP67

IP67 means the battery is fully dust-tight and can resist immersion in up to 1 meter of water for 30 minutes. For us on boats and kayaks, that’s a strong protection level against splashes, rain, spray, and accidental submersion. It increases our confidence that the battery will survive harsh marine environments.

Real-world implications

IP67 doesn’t mean we should treat the battery like it’s indestructible — we still mount it securely to prevent banging and excessive vibration, avoid saltwater immersion over time without rinsing and care, and ensure terminals and connections are protected. But it does significantly reduce the chance that moisture will damage the internal cells or electronics.

Safety and environmental aspects

We’ll discuss safety features and how LiFePO4 chemistry compares to other batteries. Safety is crucial in confined spaces like cabins and enclosed compartments.

Why LiFePO4 is safer

We appreciate that LiFePO4 has a very stable chemistry compared with other lithium types. It is less prone to thermal runaway, produces no dangerous gassing under normal operation, and it’s non-toxic compared with lead-acid in terms of ongoing emissions. RELiON highlights no gassing and no fumes, which we value for cabins, enclosed battery compartments, and sheltered installations.

Built-in protections and recommended practices

RELiON batteries commonly include internal Battery Management Systems (BMS) that protect against overcharge, over-discharge, short circuits, and cell imbalance. We recommend confirming that the RB80 includes those protections in the official spec sheet, and we always pair batteries with appropriately rated fuses, proper wiring, and a charger designed for LiFePO4 chemistry. Good ventilation, secure mounting, and electrical fuse protection remain essential.

Charging behavior and tips

We’ll outline recommended charging practices and common pitfalls. Proper charging greatly affects performance and longevity.

Recommended charging approach

We find it best to use a charger that supports LiFePO4 charging profiles or a smart charger with a LiFePO4 setting. Typical bulk/absorption voltages for 12V LiFePO4 packs are often around 14.2–14.6V, with little need for a conventional float voltage. Many users rely on solar charge controllers (MPPT) set for LiFePO4, DC-DC chargers for alternator charging, or dedicated LiFePO4 shore power chargers.

Alternator charging and DC-DC converters

We often recommend using a DC-DC charger when charging from an alternator, especially in vehicles or boats where the alternator’s voltage regulation may not match LiFePO4 needs. DC-DC chargers ensure proper charge voltage and can provide isolation and battery-to-battery charging logic. This prevents undercharging or improper charge profiles that can limit life.

Cold temperature considerations

We know LiFePO4 batteries can be sensitive to charging below freezing. If we expect to charge in sub-freezing conditions, we should check whether the RB80 includes low-temperature charging protection in its BMS or install a charger with temperature compensation or a battery heater. Charging a LiFePO4 cell below 0°C without protection can damage the battery.

Installation and mounting

We’ll cover practical installation pointers for marine and mobile setups. Good mounting and wiring practices ensure safety and longevity.

Mounting basics

We advise securing the battery in a well-ventilated, dry location that still provides easy access for maintenance and inspection. The IP67 rating gives some confidence about moisture, but we still prefer dry compartments when possible. Use robust straps or brackets rated for marine use to prevent movement under load.

Wiring and fusing

We always place the appropriate fuse or circuit breaker close to the battery positive terminal to protect against accidental short circuits. Use copper marine-grade wiring sized to minimize voltage drop for high current draws, and ensure terminal connections are tight and corrosion-protected. For parallel installations, we prefer balanced cabling to ensure equal current sharing.

Parallel and series configurations

We’ll explain how the RB80 can be scaled and what to watch for when expanding capacity. Systems often require multiple batteries for greater energy or higher voltage.

Parallel use for capacity

Because the RB80 is a 12V battery, we can connect multiple units in parallel to increase capacity (Ah). When paralleling, it’s crucial to use identical batteries (same model, age, and state of charge) and connect them with equal-length cables to encourage even current sharing. We also recommend using a battery balancer for large parallel banks and monitoring their states with a battery monitor.

Series for higher voltage

If we need higher system voltage (24V or 48V), we can connect batteries in series; however, connecting LiFePO4 in series requires close attention to matching and sometimes an external battery management or balance system for extended reliability. For series connections, we again insist on using identical batteries and the manufacturer’s guidelines.

Comparison: RELiON RB80 vs lead-acid

We’ll provide a direct comparison to show the practical differences. Many buyers will be deciding between traditional lead-acid and modern LiFePO4.

Key differences

Usable capacity: LiFePO4 gives nearly 100% usable capacity; lead-acid is commonly limited to 50% recommended depth of discharge. That means an 80Ah LiFePO4 essentially replaces a 160Ah lead-acid in usable terms.
Weight: RB80 is significantly lighter, improving handling and performance for marine craft.
Cycle life: RB80 offers thousands of cycles; lead-acid commonly offers a few hundred to early thousands depending on type and maintenance.
Maintenance: LiFePO4 is maintenance-free with no watering required and no gassing; lead-acid may require topping up (flooded types) and careful charging to avoid sulfation.
Cost over life: Upfront cost for LiFePO4 is higher, but total cost of ownership can be lower due to the extended lifetime and higher usable capacity.

When lead-acid might still be chosen

We recognize that lead-acid may be selected for lower upfront cost or existing system compatibility. If weight and deep-cycle life aren’t priorities, or if the system is only used sporadically, lead-acid can be serviceable. For our use cases where weight, space, and cycle life matter, RB80 becomes a clearer choice.

Comparison: RELiON RB80 vs other LiFePO4 brands

We’ll lay out what differentiates RELiON from competitors. Not all LiFePO4 packs are created equal, and brand reputation and support matter.

RELiON strengths

We find RELiON to be a reputable brand with a good track record in the marine and RV markets. The 10-year warranty, IP67 rating, and stated cycle life place RB80 among the better options for those who want longevity and field reliability. RELiON’s support resources and documentation are often cited as beneficial for installers and DIYers.

Things to consider with comparisons

When comparing brands, we look at cell source, BMS capabilities, warranty terms, real-world user reports, and availability for service. Some brands may offer lower price but shorter warranties or less robust BMS protections. We usually prefer to invest a bit more in a battery with strong warranty and support.

Maintenance and storage

We’ll provide practical maintenance and storage tips to maximize battery life. LiFePO4 is low maintenance, but correct practice still matters.

Regular checks

We recommend periodic inspection of terminals for corrosion, ensuring mounting straps remain secure, and verifying that charging sources are functioning correctly. A battery monitor helps us understand state of charge and detect issues early.

Long-term storage

For long-term storage, we like storing LiFePO4 at a partial state of charge (roughly 30–60%) in a cool, dry place. Avoid leaving the battery fully discharged for long periods and avoid charging in sub-freezing temperatures if the battery lacks low-temperature charging protection.

Warranty and support

We’ll explain the practical meaning of the 10-year warranty and how it affects our buying decision. A long warranty adds confidence if the company stands behind the product.

What the 10-year warranty implies

A 10-year warranty from RELiON indicates they expect the product to remain functional for a decade under normal use. We should read the warranty fine print for terms like cycle counts, allowable usage patterns, and exclusions (abuse, improper charging, physical damage). In general, a decade-long warranty is a strong positive when choosing a battery for critical applications.

Support and documentation

We appreciate manufacturers who provide clear installation guides, charge profiles, and technical support. RELiON typically offers documentation and customer support channels; we recommend verifying availability in our region before purchase for faster troubleshooting and claims.

Use cases: marine, trolling motors, kayaks, RV, solar, off-grid

We’ll discuss specific applications and how the RB80 fits each.

Boat and kayak use

For small boats and kayaks with electric trolling motors or electronics, RB80 offers a compelling mix of power and weight savings. Its IP67 rating and lightweight construction make it easier to mount and move. For kayaks, pairing one RB80 with lightweight mounting systems makes multi-day trips more feasible without excessive weight penalty.

Trolling motors

We value the RB80 for trolling motor setups where continuous current draw and weight are critical. The high usable capacity and ability to sustain higher discharge rates (compared with lead-acid) mean more run time at higher throttle levels. Always check the trolling motor’s current draw to match battery amp-hour needs and consider carrying a second battery or charging plan for extended trips.

RV and cabin use

In RVs and small cabins, the RB80 is an ideal house battery for lights, refrigerators, and electronics. The lack of gassing makes it suitable for enclosed compartments, and its long cycle life reduces replacement frequency. For larger RV systems we’d parallel additional RB80s to meet energy demands.

Solar and off-grid

We like combining RB80 batteries with solar arrays because the higher usable capacity reduces the number of batteries needed, saving weight and space. LiFePO4 works well with MPPT charge controllers and provides predictable performance for daily cycling. For off-grid cabins or weekend systems, a two- or three-battery bank gives comfortable autonomy.

Pros and cons

We’ll summarize the biggest advantages and the potential limitations to help us decide.

Pros

High usable capacity (virtually 100%).
Long cycle life (3,500–5,000 cycles).
Lightweight vs lead-acid — easier handling and better system efficiency.
IP67 rating — strong protection for marine and outdoor use.
Eco-friendly: no gassing and fewer pollutants.
10-year warranty provides long-term confidence.

Cons

Higher upfront cost compared with lead-acid.
Charging below freezing requires caution or additional systems.
Need to verify specific BMS features and confirm compatibility with alternators and chargers.
Parallel/series expansion requires careful planning and matched batteries.

Practical recommendations for buyers

We’ll give actionable advice for selecting and using the RB80 in real life.

Confirm exact weight and dimensions to ensure fitment in your battery compartment.
Use a charger or controller with a LiFePO4 profile, and consider a DC-DC charger if charging from an alternator.
Install an appropriately rated fuse or breaker near the battery positive terminal.
If deploying multiple batteries, buy them at the same time and from the same batch for best long-term balance.
Monitor battery state-of-charge with a quality battery monitor to avoid unexpected depletion and to track performance over time.
Keep batteries in a moderate temperature environment when possible; avoid repeated exposure to extreme heat.

Troubleshooting and common questions

We’ll cover brief solutions to common issues we might encounter.

Battery won’t charge from alternator

We often find alternators may not provide the correct voltage profile for LiFePO4 charging. Use a DC-DC charger or adjust the alternator/charging system to provide appropriate bulk/absorption voltage, or confirm the BMS hasn’t disabled charge due to low temperature or a fault.

Battery shows lower capacity than expected

Capacity will gradually fall with age; however, if we see sudden drops, check the state of health via a battery monitor, confirm the charger is configured correctly, and verify connections. Corroded or loose terminals can create apparent capacity loss.

Can we parallel RB80s?

Yes, but only with identical batteries and proper cabling. We recommend connecting equal-length cables and considering a battery balancer or battery management/monitoring system for larger banks.

Final verdict

We’ll summarize our overall view and whether we’d choose this battery. After evaluating specs, real-world implications, and use-case fit, we find the RELiON RB80 to be an excellent choice for users who want lightweight, reliable, long-lasting power in marine, RV, and off-grid applications. The combination of 80Ah usable capacity, IP67 protection, and a 10-year warranty makes it a strong contender for anyone upgrading from lead-acid or building a modern mobile power system.

We’d recommend this battery if:

We need a compact, lightweight, and durable 12V solution.
We value long cycle life and low maintenance.
We operate in marine or outdoor environments where waterproofing and reliability matter.

We’d be cautious if:

Upfront budget is extremely constrained and the short-term cost is the only consideration.
We can’t properly manage charging conditions (e.g., alternator limitations or extreme cold without mitigation).

Frequently asked questions (brief)

We’ll finish with concise answers to questions we often get.

Q: How much usable energy does the RB80 provide? A: About 960Wh nominal, and since LiFePO4 allows near-full depth of discharge, most of that energy is usable.

Q: Is the RB80 safe for enclosed spaces like cabins? A: Yes — LiFePO4 produces no gassing during normal operation, and the IP67 rating adds protection, but proper installation and ventilation are still recommended.

Q: Do we need a special charger? A: A charger or controller with a LiFePO4 profile is recommended. Using a DC-DC charger for alternator charging is advisable for reliable charging performance.

Q: Can we connect RB80s in parallel for more capacity? A: Yes, but use identical batteries, equal cable lengths, and follow best practices for paralleling lithium batteries.

Q: What does the 10-year warranty cover? A: Warranty coverage specifics vary, so we should read the warranty terms for cycle thresholds, usage limits, and exclusions. Generally, it signals manufacturer confidence for long-term performance.

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