Deep Cycle Batteries
When you’re searching for reliable power solutions, you need batteries that deliver when it matters most. At National Battery Supply, we specialize in energy systems built for dependability. Unlike starter batteries designed for quick bursts, our marine deep cycle batteries for sale excel at handling repeated charging and discharging cycles. They’re perfectly suited for solar systems, RVs, boats, golf carts, and reliable home backup power. From our Home Battery Backup System with Indoor LiFePO₄ Power and Hybrid Inverter for everyday peace of mind, to our 51.2V LiFePO₄ Battery 5kWh Energy Storage System for off-grid independence we deliver proven, long-lasting solutions you can count on.
Deep Cycle Batteries
What Makes Deep Cycle Batteries Different?
Deep cycle batteries use thicker lead plates and different chemistry than regular car batteries. This design lets them safely drain down to about 20% without getting damaged something your typical car battery can’t handle. We’ve tested these in boats, solar setups, and RVs for years, and they keep delivering consistent power even when used daily. What really stands out is their lifespan. While car batteries might give you 200-300 charge cycles before they start failing, a good deep cycle battery can hit 2,000 cycles or more with proper care. That’s because they’re built for the long haul, not quick power bursts.
Why Choose Our Marine Deep Cycle Batteries?
Investing in deep cycle power storage is really about peace of mind. You know your equipment won’t cut out unexpectedly, and you save money in the long run because the batteries are built for repeat use.
Durability – Many models are designed to last through thousands of cycles.
Stable Output – Consistent voltage, even with heavy use.
Flexibility – Works across solar setups, mobility devices, and backup systems.
Low Maintenance – AGM and Gel require little to no upkeep.
Smart Options – Large-scale solutions such as the 20–120kWh Scalable Battery Storage System provide advanced energy management for businesses or bigger properties.
51.2V LiFePo₄ Battery – 5 kWh Energy Storage System
The 51.2V LiFePo₄ Battery – 5 kWh Energy Storage System is a compact yet powerful option for small to medium energy needs. Its advanced lithium iron phosphate chemistry offers long cycle life, rapid charging, and safe, maintenance-free operation—ideal for home or small commercial setups.
20–120 kWh Scalable Battery Storage System for Energy Backup
The 20–120 kWh Scalable Battery Storage System for Energy Backup grows with your energy requirements. Its modular design lets you expand capacity as needed, making it an excellent choice for commercial facilities, micro-grids, and large residential projects seeking long-term reliability.
Home Battery Backup System – Indoor LiFePo₄ Power with Hybrid Inverter
The Home Battery Backup System – Indoor LiFePo₄ Power with Hybrid Inverter provides seamless energy storage for residential use. Its built-in hybrid inverter ensures stable power during outages while supporting efficient solar charging. Perfect for homes that need a reliable, eco-friendly backup solution.
51.2V 200Ah Battery – 10 kWh LiFePo₄ for Solar or Backup
The 51.2V 200Ah Battery – 10 kWh LiFePo₄ for Solar or Backup delivers high-capacity storage with robust LiFePo₄ technology. It supports heavy power loads for solar systems or emergency backup, ensuring safe, stable energy with exceptional cycle life.
Ready to Power Your Home or Business?
Smart Battery Solutions for Any Power Challenge
Our batteries handle different power needs across various applications. Homeowner’s can use the 5kWh LiFePO₄ battery to store solar energy during the day and power essentials at night. Small businesses often upgrade to the scalable 120kWh system after experiencing costly power outages that shut down operations.
These same batteries work well in recreational vehicles for weekend trips, marine applications for trolling motors and electronics, plus golf cart fleets at courses. Basically, anywhere consistent power matters, these units deliver reliable performance.
Easy Ways to Care for Deep Cycle RV Batteries
Your deep cycle RV batteries will last much longer if you follow a few basic rules. Never let them go completely dead recharge when they hit around 20%. Make sure you’re using the right charger because the wrong one can fry expensive batteries. Check stored batteries once a month and keep some charge in them. Heat kills batteries fast, so find a cool spot for storage. Grab a wire brush and clean those terminals every couple months corrosion causes tons of headaches. Whether you’ve got a small 5kWh solar battery or a big 10kWh house backup, these same tricks apply. We fix way too many batteries that just needed proper care.
Power Your Future with Long Lasting Marine Deep Cycle Batteries
What Our Clients Are Saying
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FAQ’s
How long do deep cycle batteries last?
Are all marine batteries deep cycle?
Not all marine batteries are deep cycle. Marine batteries come in two types: starting batteries and deep cycle batteries. Starting batteries are designed to provide a quick burst of power to start your boat’s engine, while deep cycle batteries are designed to provide a steady amount of power over a longer period for running accessories like lights, fish finders, or trolling motors. Some marine batteries, like hybrid or dual-purpose batteries, combine both features, but not all marine batteries are deep cycle.
How long can a deep cycle battery last without charging?
The lifespan of a deep cycle battery without charging depends on several factors, including the type of battery, its state of charge, and the temperature conditions. Generally, a fully charged deep cycle battery can last anywhere from 1 to 6 months without charging, depending on its age and condition. However, it’s always a good idea to recharge the battery if it has been unused for an extended period to avoid damaging the cells.
How to charge a marine deep cycle battery?
To charge a marine deep cycle battery, you’ll need a battery charger that matches the voltage and type of your battery (usually 12V). Follow these steps:
- Ensure the charger is unplugged before connecting it to the battery.
- Attach the positive (red) charger cable to the positive terminal of the battery and the negative (black) cable to the negative terminal.
- Set the charger to the appropriate voltage and current settings for your battery.
- Plug in the charger and allow the battery to charge fully (this could take several hours).
- Once charged, unplug the charger and disconnect the cables in reverse order (negative cable first).
- Always monitor the charging process to avoid overcharging, which can shorten the battery’s life.
How often should I charge my deep cycle battery?
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National Battery Supply delivers dependable energy storage solutions tailored to commercial, industrial, and government applications. Our catalog ranges from custom battery manufacturing and UPS systems, portable power stations, to high-capacity solutions like whole-home battery energy storage systems (BESS) and scalable containerized energy storage units- engineered for reliability, flexibility, and rapid deployment.
We support critical infrastructure, telecom, data centers, healthcare, and remote operations with power systems built for performance in demanding environments. Whether it’s deep cycle batteries, lithium forklift replacements, OEM portable power kits, solar backups, and large-scale energy storage systems. We provide tailored solutions with short lead times, custom branding, and bulk pricing.
Our team also specializes in helping integrators, resellers, and developers source complete battery systems for residential microgrids, off-grid power stations, and industrial container setups. Whether you need to back up a home, energize a remote site, or manage facility-wide loads, we have the scalable energy storage options to match.
Contact us today to learn how our advanced power systems can reduce downtime, extend operational capacity, and support your long-term energy goals.
National Battery Supply is a reputable manufacturer specializing in custom battery solutions. With over 20 years of experience, we can manage all your power needs.