48V 100Ah LiFePO4 Battery with 20A Charger review

Looking for a reliable, lighter-weight upgrade for your golf cart, RV, or marine vessel battery system?

Product Overview: 48V 100Ah LiFePO4 Golf Cart Battery, 10.24kW Peak Power & 4000+ Cycles, Built-in 200A BMS | with 48V 20A Lithium Battery Charger, LCD Screen & APP Monitoring | for Golf Carts, RV, Marine

You’ll find this Mosasaur 48V 100Ah LiFePO4 battery designed to replace bulky lead-acid banks while offering modern features like a built‑in 200A BMS, LCD touch screen, and mobile app monitoring. It ships as a complete kit with a 48V 20A charger and a drop-in, lead-acid-style case so installation should feel familiar if you’re swapping from an older pack.

Quick description

The battery is a 48-volt, 100 amp-hour LiFePO4 pack with a reported peak power of 10.24 kW and more than 4,000 cycles. It weighs about 77 lbs and measures 20.55″ L x 10.55″ W x 8.74″ H, designed as a plug-and-play drop-in replacement for many 48V systems.

Key specifications

Below is a clear breakdown so you can see the numbers at a glance. This is helpful for system planning, charging, and load calculations.

What you get in the box

You’ll receive the Mosasaur battery, a 48V 20A charger, and likely some cabling and basic hardware for installation. The manufacturer includes instructional videos to guide the plug-and-play setup, which makes the swap smoother than a full custom retrofit.

Design and build

The battery uses a lead-acid style enclosure to ease installation into existing trays and mounts, but the internal chemistry is LiFePO4, which gives you a big longevity and weight advantage. At 77 lbs, it’s much lighter than many traditional lead-acid banks, so you’ll find lifting and handling easier.

Case and mechanical fit

Because the case mimics common lead-acid footprints, you won’t usually have to modify mounting points. You should still confirm terminal orientation and spacing before swapping to ensure a true drop-in fit.

Weight advantage

You’ll notice the weight reduction immediately if you’re used to older lead-acid setups. Lighter weight helps handling and can mildly improve vehicle efficiency, especially in small vehicles like golf carts and compact RVs.

Performance and power delivery

This battery provides a nominal 4.8 kWh of energy and a claimed peak output of 10.24 kW. The on-board 200A BMS provides protective functions and supports high-current demand seen during acceleration or climbing.

What that means in practical terms

If your vehicle draws 1 kW on average, you can expect roughly 4.8 hours of runtime from a fully charged battery (theoretical). Real-world usable energy depends on how much depth-of-discharge (DoD) you use; LiFePO4 chemistry usually allows higher usable DoD than lead-acid, but it’s sensible to plan for 80–90% usable capacity for longevity.

Example runtime calculations

These rounded examples help you estimate how long the battery will run under different loads:

• 1 kW continuous draw: ~4.8 hours theoretical, ~3.8–4.3 hours with conservative 80–90% usable capacity.
• 2 kW draw: ~2.4 hours theoretical, ~1.9–2.2 hours usable.
• 5 kW draw (short bursts like steep climbs): ~0.96 hours theoretical; high-power draws will be limited by the BMS and peak rating and will shorten usable runtime quickly.

Continuous vs peak power

The 200A BMS suggests a continuous capability of ~9.6 kW (48 V × 200 A). The 10.24 kW peak rating is intended for short bursts. You should avoid running at peak for extended durations to prevent thermal cutoffs or BMS intervention.

Charging: charger, time, and tips

The included 48V 20A charger is well matched to the battery size and gives you near-optimal charging times for daily use.

Charging time

The simple math: 100 Ah / 20 A = 5 hours from empty to full in ideal conditions. Accounting for charging inefficiencies and tapering at the end of charge, expect about 5–6 hours typical for a near-empty battery. If you charge from partial states of charge, multiply proportionately.

Charger benefits and safety

A 20A charger is gentle compared to high-current options, promoting cell longevity and aligning with the onboard BMS protections. The included charger is likely configured for LiFePO4 charging profiles, which is important because charging profiles for LiFePO4 differ from lead-acid.

Battery Management System (BMS)

The 200A smart BMS is one of the most important components. It monitors cell voltages, balances cells, and protects against common faults.

Protections included

You can expect protection against over-charge, over-discharge, over-current, short-circuit, and over-temperature. The cell balancing function helps maintain consistent cell health, which is a major reason the battery achieves 4000+ cycles.

What you should monitor

Keep an eye on state-of-charge (SOC), individual cell voltages (if available via the app), pack voltage, and temperature. The app and LCD provide these metrics so you can spot issues early and avoid abusive conditions.

Monitoring: LCD touch screen and mobile app

Dual monitoring gives you flexibility: a built-in LCD touch screen shows live data on the battery itself, while the mobile app gives you remote access to the same metrics.

On-unit monitoring

The LCD lets you view SOC, voltage, current, and fault indications at a glance. It’s useful when you’re physically near the battery and want immediate status without a phone.

App monitoring and remote control

The app provides remote monitoring and sometimes more detailed logs and settings. You’ll appreciate the ability to check battery status from your phone before heading out. Make sure your device is paired and that you’re running the latest version of the app for reliability.

Installation and setup

Installation is designed to be simple, but you should always follow safety precautions and ensure compatibility.

Pre-install checklist

• Verify the physical dimensions and terminal locations match your tray.
• Confirm your vehicle’s voltage system is 48V and components are compatible with LiFePO4.
• Inspect wiring, fuses, and connectors for wear; replace if needed.
• Read the provided documentation and watch the instructional videos included by the manufacturer.

Step-by-step installation (general guidance)

1. Disconnect and remove the old battery bank, observing proper safety for lead-acid batteries if present.
2. Inspect and clean battery tray and terminals.
3. Place the Mosasaur battery in the tray and secure it using the existing hold-downs or included hardware.
4. Connect positive and negative terminals, ensuring correct polarity and tight connections.
5. Connect the included charger and perform an initial charge if recommended in the manual.
6. Pair the battery with the mobile app and confirm the LCD shows normal status.
7. Test the vehicle under low-load conditions before normal use.

Safety notes

Always disconnect the negative terminal first when removing batteries and reconnect it last when installing. Use insulated tools and eye protection when working on batteries. If you’re unsure, consult a qualified technician.

Compatibility and applications

You can use this battery wherever a standard 48V LiFePO4 pack is appropriate: golf carts, RVs, camper vans, small marine vessels, and utility vehicles.

What to check for compatibility

• Voltage: system must be 48V nominal.
• Physical fit: dimensions should match your battery compartment.
• Wiring and connectors: ensure terminal type and spacing align or plan for minor adaptors.
• Charging system: newer onboard chargers and controllers will be fine; older lead-acid chargers should be replaced or bypassed if incompatible.

Longevity and lifecycle expectations

Manufacturer claims of 4000+ cycles reflect typical LiFePO4 performance under moderate DoD and proper use. That cycles number translates to many years of service if you don’t deeply cycle every single day.

Real-world expectations

If you cycle the battery daily at moderate DoD (e.g., 50–80%), you’re likely to get several years of reliable service — often a decade or more. The 5-year warranty provides additional peace of mind and indicates the manufacturer stands behind durability.

Maintenance and care

LiFePO4 batteries are low-maintenance compared with lead-acid, but you should still perform routine checks.

Routine maintenance checklist

• Keep terminals clean and free from corrosion.
• Check mounting hardware for tightness.
• Monitor SOC and charge regularly; avoid leaving in deeply discharged states.
• Store in a cool, dry place if not in use for long periods; partial state of charge (~40–60%) is recommended for long-term storage.

Seasonal storage tips

If you’ll store the battery for months, keep it charged to around 40–60% and top it up every few months to avoid prolonged low-voltage stress. Keep the battery within recommended temperature ranges.

Safety considerations

LiFePO4 chemistry is inherently safer than some other lithium types, but safety still matters.

Key safety points

• Avoid exposing the battery to extreme heat or sub-freezing temperatures during charging.
• Don’t bypass the BMS or attempt to charge with improper profiles.
• If you detect swelling, unusual smells, or persistent faults, stop using the battery and contact support.

Troubleshooting common issues

If you run into trouble, many issues are straightforward to diagnose and fix.

Typical problems and quick fixes

• Battery won’t charge: check charger connections, fuses, and confirm charger output. Verify BMS hasn’t triggered a protective cutoff.
• Rapid self-discharge: inspect for parasitic loads or a faulty BMS. Confirm no accessories are draining power while vehicle is off.
• App not pairing: ensure Bluetooth connectivity, app permissions, and that the battery’s Bluetooth module is active. Restart devices if needed.

When to contact support

Use the 5-year US-based warranty and support if you encounter unexplained faults, error codes that persist, or suspected hardware defects. Keep purchase and serial details handy for faster assistance.

Pros and cons

You’ll want to weigh strengths and limitations to see if this battery matches your needs.

Pros

• Significant weight reduction compared to typical lead-acid banks.
• LiFePO4 chemistry gives long cycle life (4000+ cycles claimed).
• Built-in 200A BMS and 10.24 kW peak power support high loads for short bursts.
• Dual monitoring with LCD and app gives great visibility.
• Drop-in lead-acid case eases replacement.
• Charger included for a complete kit.
• 5-year warranty and US-based support.

Cons

• Peak power is for short bursts; sustained high-power use approaches BMS limits.
• Charger is 20A, which is ideal for longevity but slower than high-power fast chargers.
• Physical fit and terminal orientation still need confirmation before purchase.
• Upfront cost is higher than a single lead-acid battery, though total lifecycle cost is often lower.

How it compares to lead-acid and other lithium options

If you’re coming from lead-acid, expect major improvements in weight, usable capacity, and long-term cost. Compared to other lithium chemistries, LiFePO4 trades slightly lower energy density for better thermal stability and cycle life.

Practical comparison points

• Weight: You’ll likely reduce pack weight by a large margin.
• Usable capacity: LiFePO4 lets you use more of the rated capacity without damaging the pack.
• Maintenance: Far less topping up and maintenance than flooded lead-acid batteries.
• Safety: LiFePO4 is among the safer lithium chemistries for vehicle use.

Who should buy this battery?

You should consider this battery if you want a drop-in upgrade to reduce weight, increase runtime, and simplify maintenance in golf carts, RVs, boats, or utility vehicles. It’s ideal for users who value long cycle life, built-in protection, and remote monitoring.

Use-case examples

• You run a golf cart business and want to reduce downtime and battery replacement frequency.
• You own an RV and want lighter batteries to free payload and improve range.
• You have a small boat where space and weight matter but high safety is essential.
• You’re upgrading a utility vehicle for daily use and want more reliable, modern battery tech.

Cost of ownership considerations

While LiFePO4 packs have higher initial cost versus lead-acid, the longer cycle life and reduced maintenance typically lower total cost over the battery’s usable lifetime. Factor in the 5-year warranty for additional value.

Lifecycle math (simple view)

• If lead-acid lasts 300–800 cycles vs LiFePO4’s 4000+ cycles, you may replace lead-acid multiple times over the life of one LiFePO4 pack.
• Reduced charging time and efficiency gains from lower weight can also produce savings in fuel or energy costs.

Frequently Asked Questions

You’ll probably have a few typical questions — here are clear answers to the most common ones.

Can you charge this with a solar array or other chargers?

Yes, you can charge via a solar charge controller sized for a 48V LiFePO4 system. Use a charge controller that supports LiFePO4 charging profiles and limit charge current to the battery’s acceptable input (20A included charger is conservative; higher current chargers may be used only if compatible with the BMS and wiring).

Will it fit my golf cart?

Often yes, because of the lead-acid case design, but you must measure your battery tray and confirm terminal locations before purchase.

How many years will it last?

Cycle life of 4000+ translates into many years of life depending on how frequently you cycle the battery. With moderate use, a decade or more is possible.

Is the app mandatory?

No. The LCD provides on-site details. The app gives convenience and remote visibility, which many users find valuable.

Final thoughts and recommendation

If you want a modern, lower-weight replacement for lead-acid battery banks with strong cycle life, comprehensive BMS protections, and convenient monitoring via both an LCD screen and app, the Mosasaur 48V 100Ah LiFePO4 battery is a compelling option. The included 20A charger, drop-in form factor, and 5-year US-backed warranty make this package practical for a wide range of 48V systems. You’ll benefit from easier installation, better long-term value, and a safer lithium chemistry suited to vehicle use.

If you’re planning high continuous power draws for extended periods, double-check the continuous current needs for your application and consider whether additional packs or different sizing would better match sustained power requirements. Otherwise, this battery delivers a strong mix of safety, convenience, and performance for golf carts, RVs, marine applications, and similar platforms.

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