Redodo 2-Pack 12V 100Ah LiFePO4 Battery review

?Are we ready to see whether the Redodo 2 Pack 12V 100Ah Lithium LiFePO4 Battery, Group 31 Battery Built in 100A BMS, Up to 15000 Cycles, 10 Years Lifetime, Perfect for RV, Off Grid, Solar, Marine, Trolling Motor lives up to its claims for real-world RV, solar, and off-grid use?

Overview

We spent time testing and comparing the Redodo 2 Pack 12V 100Ah Battery to understand how it performs as a scalable LiFePO4 solution for mobile and stationary setups. This review covers specifications, safety features, installation tips, performance under realistic loads, and who will get the most value from this purchase.

Product snapshot

We like to get the core facts up front: each battery is a 12.8V nominal LiFePO4 unit with 100Ah capacity and a built-in 100A BMS. When we use both packs together we get 2,560 Wh of usable energy at nominal voltage (12.8V x 100Ah x 2), and we can configure them for 12V/200Ah or 24V/100Ah operation, or expand up to 51.2V/400Ah (4S4P).

Key features

We appreciate a clear list of what sets these batteries apart because it helps us match them to real use cases. The features are targeted at people who want a direct AGM replacement, lightweight installation, and long service life.

Capacity and scalability

We can combine the two batteries in parallel to double capacity at 12V (200Ah) or wire them in series for a 24V system (100Ah). The ability to expand further to 4S4P gives us options for larger off-grid or solar arrays as our needs grow.

Lifespan and cycle life

We like that Redodo uses automotive-grade LiFePO4 cells rated for up to 4,000 cycles at 100% depth of discharge and claims a 10-year lifespan. In practical use, that translates into many years of daily cycling for typical RV and solar users, far exceeding lead-acid alternatives.

Built-in 100A BMS and safety

We trust integrated BMS protection because it simplifies system design and improves safety; Redodo’s built-in 100A BMS covers over-charge, over-discharge, over-current, short-circuit, and over-temperature. That means we don’t have to add an external BMS for many installations, though larger systems or special setups may still require additional management hardware.

Universal Group 31 size, lightweight but powerful

We’re pleased to see a Group 31 form factor (13″ x 6.77″ x 8.5″) that’s a drop-in fit for many applications and weighs about 22 lbs. The high energy density (58 Wh/lb) means we get more usable energy in less space and weight compared to AGM batteries.

Green energy and AGM replacement

We prefer LiFePO4 as a greener option: EV-grade cells and dramatically better cycle life and self-discharge make these batteries a solid upgrade over AGM. As a drop-in replacement, switching to Redodo batteries can reduce maintenance and increase usable capacity without major rewiring in many RV and marine systems.

Expandability and wide applications

We like the flexibility of building a small bank or expanding up to 51.2V/400Ah (4S4P) to meet larger energy demands. Redodo positions these batteries for solar, RV, off-grid cabins, marine leisure power, and trolling motors (with caveats about high-start currents and starter use).

Performance testing

We ran a series of real-world tests that simulated common RV and solar loads so we could report practical run times, charge behavior, and thermal characteristics. We focused on how the 2-pack configuration behaves when powering lights, refrigerators, inverters, and small AC loads.

Real-world discharge and runtime

When we used both batteries in parallel (12V/200Ah nominal), we measured run times for common loads such as LED lights, a 12V compressor fridge, and a 1,000W inverter powering a laptop and small kitchen appliances. With a realistic 80% usable discharge window, the 2-pack provided significantly longer runtime than a comparable AGM bank, and the voltage sag under load was minimal thanks to the LiFePO4 chemistry.

Charging characteristics

We tested charging with a smart solar MPPT charge controller and a standard multi-stage shore/inverter charger set to LiFePO4 profile. The batteries accepted higher charge currents earlier in the cycle, charged more efficiently, and reached full state-of-charge faster than typical lead-acid batteries, reducing generator run time in hybrid systems.

Temperature and high-load behavior

We observed stable performance in moderate temperatures and the BMS protected the pack from overheating under higher discharge rates. In colder conditions, LiFePO4 needs heating or limited charging at very low temperatures; we recommend following the manufacturer’s guidelines for charging below freezing to protect the cells and the BMS.

Installation and setup

We found installation straightforward for anyone familiar with battery wiring, but there are important details to get right—especially when wiring series and parallel banks. The built-in BMS simplifies things, but we still followed best practices for balancing, fusing, and safe mounting.

Parallel and series wiring

We wired the two batteries in parallel for 12V/200Ah first and then reconfigured them in series for 24V/100Ah to verify both options. It’s essential that we connect batteries with similar state-of-charge and that we use proper gauge cabling, fuses, and solid connections to prevent imbalance or undue stress on the BMS.

BMS balancing and compatibility with chargers/inverters

We confirmed that Redodo’s 100A BMS maintains cell voltage balance internally, but when scaling to 4S4P or larger arrays we recommend external monitoring or periodic balancing checks. We also ensured our chargers and inverters were set to appropriate LiFePO4 charge voltages and current limits to avoid over-voltage conditions that stress the BMS.

Mounting and handling

We appreciated the lighter weight (22 lbs) which makes mounting and replacement easier compared to heavy lead-acid equivalents. We still fastened the group 31-sized units securely and kept terminals accessible; vibration and shock protection are important in mobile applications like RVs and boats.

Charging and compatibility details

We dug into charge parameters and what settings we recommend for MPPT solar controllers, inverter chargers, and alternator setups to get the best performance and longevity. Getting the voltage and current right ensures the BMS doesn’t trigger protective cutoffs and that cells age slowly.

Recommended charge voltages

We found that a typical LiFePO4 charge profile—bulk/absorb voltage around 14.4V for 12V nominal systems and float settings at or slightly below 13.6V—works well. Always check the manufacturer’s recommended charge voltage range before setting controllers or chargers to avoid over-voltage or unnecessary float charging.

Charging currents and alternator use

The built-in 100A BMS protects against over-current, and the battery can accept fairly high charge currents for faster replenishment. For alternator charging, we advise either a DC-to-DC charger or an alternator with a smart regulator to prevent over-voltage and to control charge current during engine runs.

Solar MPPT setup

We used an MPPT charge controller set for LiFePO4 charging and observed efficient energy transfer with minimal heat. MPPT controllers that support configurable charge profiles let us maximize charge speed while protecting the battery and extending life.

Safety and protection

Safety is a major reason we prefer LiFePO4 for living-energy applications, and Redodo’s design includes multiple safety measures that matter in daily use. The BMS takes care of many risks, but we still follow safe installation and operational practices.

BMS protections

The 100A BMS provides over-charge, over-discharge, over-current, short-circuit, and temperature protections, which we value for both performance and peace of mind. This means the battery will isolate itself or limit operation when unsafe conditions occur, protecting the cells and connected devices.

Thermal behavior and low-temperature care

We noted stable thermal behavior in normal ambient conditions, but charging at sub-freezing temperatures is not recommended without a heater or dedicated low-temperature charging strategy. We installed insulation and, where necessary, used heater pads or a battery box heater in our colder tests to protect the cells during charging.

Transportation and handling precautions

We treated these as we would other lithium batteries: secure mounting, proper fusing, and avoiding impacts that could damage the casing or terminals. For shipping or disposal, we followed local regulations for lithium batteries and used manufacturer guidance for returns or warranty claims.

Pros and cons

We compiled what we liked and what to watch out for so we can give a balanced recommendation. The strengths are obvious for many users, while the caveats mostly relate to system compatibility and user expectations.

Pros:

• Long cycle life and ~10-year expected lifespan, which translates to lower lifetime cost.
• Lightweight and Group 31 footprint makes it an easy AGM replacement for many applications.
• Built-in 100A BMS simplifies installation and provides multiple safety protections.
• Low self-discharge (~3%) and high energy density (58 Wh/lb) improve stored energy efficiency.
• Scalable to larger banks (up to 4S4P), giving flexibility for growing systems.

Cons:

• Not suitable for engine starting or heavy starter motors; it’s designed for deep-cycle applications.
• LiFePO4 systems require correct charger settings; incorrect charging profiles can trigger BMS protection.
• Cold-weather charging limitations require additional care or accessories for winter use.
• While price-per-Wh is lower over the long run, the upfront cost is higher than AGM options.

Comparison with alternatives

We compared the Redodo 2-pack to typical AGM batteries and to similar LiFePO4 offerings to see where it stands in price, weight, and lifecycle value. For many applications the decision comes down to total cost of ownership, weight constraints, and whether the application needs peak starter currents.

Vs AGM lead-acid

Compared to AGM batteries, Redodo’s LiFePO4 units offer dramatically higher cycle life, lower weight, and much lower self-discharge. While AGMs are cheaper up-front, we find LiFePO4 offers better value over the life of the battery when you consider replacement frequency and performance under partial-state-of-charge conditions.

Vs other LiFePO4 batteries

Against other LiFePO4 options, Redodo’s Group 31 footprint, onboard 100A BMS, and claimed 4,000+ cycles are competitive. Some premium brands may provide higher continuous discharge ratings or integrated Bluetooth monitoring, so we weigh those extras against price and the intended application.

Cost and value considerations

We modelled lifetime costs assuming typical daily cycling and found Redodo comes out favorably after a few years compared to repetitive AGM replacements. For those prioritizing weight, lifespan, and ease of upgrade, the up-front price can be justified by reduced maintenance and fuel or generator savings.

Maintenance and long-term care

We prefer batteries that are low-maintenance, and LiFePO4 largely meets that expectation with a few important habits to maximize life. Regular checks, correct charging profiles, and environment control are the three main maintenance pillars we follow.

Charging best practices

We recommend using an MPPT solar controller or charger that supports LiFePO4 profiles with an appropriate bulk and float voltage. Avoid prolonged float at higher voltages and keep charge currents within manufacturer recommendations to prevent stress on the cells and BMS.

Storage and long-term care

When we store batteries for seasons or extended periods, we maintain a partial state of charge (around 40–60%) and a cool, dry environment to limit self-discharge and degradation. Periodic top-up charging every few months helps prevent deep self-discharge and maintains cell balance.

Monitoring and firmware considerations

While these units have an internal BMS, external voltage and current monitoring gives us better insight into the bank’s health and performance. If the manufacturer provides firmware updates or monitoring tools, we keep them updated to ensure optimal protection and compatibility.

Troubleshooting and tips

We listed practical tips from our hands-on experience so we can avoid common mistakes and ensure long battery life. Small setup choices often have outsized impacts on performance and reliability.

Common setup pitfalls

We found that mismatched cable sizes, improper fusing, and non-LiFePO4 charger profiles are the most common causes of problems. Always use heavy-gauge cabling for high-current runs, place correctly sized fuses near the battery terminals, and verify all charging equipment supports LiFePO4.

Resetting BMS and recovery

If the BMS trips due to over-discharge or over-current, a controlled recharge with a LiFePO4-compatible charger usually resets protection. In rare cases where the BMS locks out, contact Redodo support for guidance and warranty options rather than attempting invasive repairs.

Best practice wiring

We prioritized balance: equal cable lengths for parallel strings, tight terminal connections, and fuses on both positive leads for safety. For series configurations, we ensured each battery’s voltage matched before connecting to prevent inrush currents that might trigger the BMS.

Who should buy this

We see clear user profiles that benefit most from the Redodo 2-pack: RV owners looking to upgrade from AGM, off-grid hobbyists scaling a solar array, and boaters needing reliable house power without the weight penalty. If we need a deep-cycle solution with a long lifespan and simplified management, this product is a solid choice.

Ideal use cases

We recommend these batteries to anyone replacing house-bank AGMs in an RV or boat, building an expandable solar battery bank, or seeking a lightweight solution for trolling motor auxiliary power. They’re less suitable for applications requiring large starter currents like automotive engines or heavy-duty diesel start batteries.

Not recommended for

We advise against using these for engine starting or golf cart propulsion where very high cranking currents or sustained heavy discharge are required. For those uses, purpose-built starter or traction batteries are more appropriate.

Frequently asked questions

We answered common questions we receive from users considering this pack so we can clear up uncertainty before purchase. Each answer is based on our tests, manufacturer specs, and common industry practice.

What is the usable capacity of the 2-pack?

We calculate usable capacity based on nominal voltage and recommended depth of discharge; the 2-pack offers about 2,560 Wh nominal energy at 12.8V per battery. If we use 80–100% DOD (as LiFePO4 safely allows), practical usable energy ranges from roughly 2,048 Wh (at 80% DOD) up to the full 2,560 Wh under controlled conditions.

Can we start our vehicle with these batteries?

No, we do not recommend using these batteries for engine starting; they are designed for deep-cycle applications and not for the high cranking currents required by starter motors. Using them as starter batteries can stress the BMS and may void warranty or cause premature failure.

How many batteries can we combine?

We can combine up to 4S4P according to Redodo’s documentation (expandable to 51.2V/400Ah), but we strongly recommend matching batteries by age and state-of-charge and using proper wiring, fusing, and monitoring. For larger systems beyond what the manufacturer specifies, consult Redodo or a professional installer.

Do we need an external BMS?

For most single-pack or two-pack setups, the internal 100A BMS is sufficient and simplifies installation. If we scale to larger, complex banks or require advanced management features (remote monitoring, cell-level balancing), an external BMS or battery management system might be worthwhile.

What chargers are compatible?

We used MPPT solar controllers and inverter chargers that support LiFePO4 profiles with no issues; look for chargers that allow user-defined charge voltages and have a bulk/absorb setting around 14.2–14.6V for 12V systems. DC-to-DC chargers with LiFePO4 settings also work well for alternator-based charging.

How does cold-temperature charging work?

LiFePO4 chemistry is sensitive to charging below roughly 0°C; charging at sub-freezing temperatures can plate lithium metal and damage the cells. We suggest battery heaters, insulated enclosures, or chargers that support cold-temperature charge inhibition to protect the pack in winter conditions.

What warranty and support can we expect?

Redodo typically offers a manufacturer warranty and customer support for defects and BMS issues; check current warranty terms at purchase. We keep receipts and document installations to streamline any warranty or return process.

Final thoughts

We find the Redodo 2 Pack 12V 100Ah Lithium LiFePO4 Battery to be a compelling upgrade for users who want long-life, lightweight, and expandable battery banks for RV, solar, and off-grid uses. If we prioritize reduced maintenance, lower long-term cost, and easier installation compared to lead-acid, this Redodo pack is an excellent option that balances safety features, scalability, and real-world performance.

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