You may be wondering what a deep cycle battery is.

Deep cycle batteries are built to be charged and recharged repeatedly. A deep cycle battery, as opposed to providing a burst of energy for tasks such as starting a vehicle, offers a constant trickle of power over a lengthy period of time.

These batteries, which are available in four basic forms, are notably useful in RV coaches, golf carts, and maritime applications.

Best Deep Cycle Batteries for RV

Universal Power Group 12V 100Ah Solar Wind AGM SLA DEEP Cycle VRLA Battery 12V 24V 48V
  • UPG #45978 UB121000 12V 100Ah
  • Dimensions: 12.17 inches x 6.61 inches x 9.16 inches. Weight: 63.93 Lbs
  • SLA/AGM maintenance free, spill proof battery
  • Rechargeable battery that can be mounted in any position, resists shocks and vibration
  • 1 Year Warranty
Sale
Weize 12V 100AH Deep Cycle AGM SLA VRLA Battery for Solar System RV Camping Trolling Motor, in Series 24V 36V 48V
  • Deep Cycle Battery 12V 100 Amp Hour Sealed Lead Acid Rechargeable ; Parcel: 1 x Battery (screws included, but no wire harness or mounting).
  • Dimensions: 12.09 x 6.65 x 9.17 inches (Replace UB121000, Renogy 100 AMP Hour). High Performance, Deep Cycle: Long Service Life and Deep Discharge Recover.
  • Used For Solar Panel Wind Off-Grid Applications, RV House Van Camping Trip, Travel Trailer, Mini Kota/Cobra/Sevylor Trolling Motor, Back-up Sump Pump, Electric Mobility Scooter Wheelchair.
  • Also For Electric Vehicles, Golf Carts, Hunting, Lawn and Garden Tools, Portable Tools, Toys and Hobby, UPS System, Industrial and Medical Equipment,Emergency Lighting, Leisure, Alarm Security and more.
  • TL12100 or LFP12100 You Will Receive, Send Randomly,They Are the Same Quality,But Different Production Batches, Pls Do Not Worry. Please Contact Us if Any Problem or Consuion!
Sale
Renogy Deep Cycle AGM Battery 12 Volt 100Ah for RV, Solar Marine and Off-grid Applications, Gray
  • Maintenance Free: Manufactured with thick absorbent glass mat (AGM) separators and advanced valve regulated technology, Renogy Deep Cycle AGM Batteries save you from acid leakage and frequent maintenance
  • Excellent Discharge Performance: Proprietary quinary alloy plates and specially treated plate grids enable low internal resistance and high discharge currents of up to 10 times the battery rated capacity
  • Long Shelf Life: Made of high purity materials, Renogy Deep Cycle AGM Batteries reduce the monthly self-discharge rate below 3% at 77℉ (25℃), which is 5 times lower than their flooded counterparts
  • Wide Operation Temperature Range: Improved electrolyte formula ensures stable battery capacity and outstanding discharge performance at low temperatures below 32℉ (0℃)
  • NOTE: We highly recommend installing the battery upright. It is allowed to install the battery on its side only if there are special reasons for doing so. DO NOT install the battery upside down.
Optima Batteries 8004-003 34/78 RedTop Starting Battery
  • 12-Volt, 800 Cold Cranking Amps, Size: 10" x 6 7/8" x 7 13/16" tall, Weight: 38.8 pounds, Dual SAE & GM Posts
  • Reserve capacity of 100 minutes for constant performance
  • Optimal starting power even in bad weather
  • This item is not for sale in Catalina Island. Battery Charger:13.8 to 15.0 volts, 10 amps maximum, approximately for six to twelve hours. Alternator:13.3 to 15 volts, no amperage limit
  • Fifteen times more resistant to vibration for durability. Mountable in virtually any position. May include convenient carrying handle for ease of placement in battery holder.
Sale
ODYSSEY PC680 Battery, red top
  • 170 CCA; Better warranty: Limited 2-year full replacement warranty, not pro rata; Longer service life: With 3-10 years of service life, ODYSSEY batteries save consumers time, money, and aggravation
  • Longer cycle life: 70 percentage longer cycle life compared to conventional deep cycle batteries, up to 400 cycles at 80 percentage depth of discharge- high stable voltage for longer periods of time
  • Faster recharge: The highest recharge efficiency of any sealed lead battery on the market, capable of 100 percentage recharge in 4 - 6 hours; Mounting flexibility: Non-spillable design
  • Vibration resistance- design protects against high impact shock and mechanical vibration; Extreme temperature tolerant
  • This item is not for sale in Catalina Island
Battle Born LiFePO4 Deep Cycle Battery - 100Ah 12v with Built-In BMS - 3000-5000 Deep Cycle Rechargeable Battery - Perfect for RV/Camper, Marine, Overland/Van, and Off Grid Applications
  • BUILT-IN BMS: BMS stands for "Battery Management System" - the brain of our deep cycle lithium batteries. Our BMS protects your battery from most common causes of battery failure, such as temperature volatility or ground faults. The BMS regulates the amount of power taken out of the battery and acts as a shut-off system to protect the li-ion cells (and you) from unsafe operating conditions.
  • LITHIUM ION TECHNOLOGY: Unlike Lead Acid batteries, Battle Born's deep cycle lithium ion batteries have unlimited mounting capability, exceptional longevity, and are more cost effective. When factoring time and cost into your purchase, our lithium ion battery banks come out ahead every time. Plus, Li-Ion batteries can be safer than Lead Acid batteries, which have no protection against ground faults.
  • GREEN ENERGY BATTERIES: Made from 100% safe, nontoxic, renewable energy, Battle Born Batteries last for more cycles and can be charged and discharged repeatedly (and charge faster than any other battery). We make our renewable, sustainable green energy batteries because they’re simply better than anything else out there, including other green batteries.
  • LIGHTWEIGHT AND VERSATILE: At a sleek 31 lbs, our 100Ah 12v battery weighs in at only 1/3 the weight of lead acid batteries! With no acid in the battery, you're able to safely mount in any position. This makes li-ion batteries perfect for marine, RV, campers, golf cart, off-road and off-grid applications!
  • BUY WITH CONFIDENCE: Proudly designed and assembled in the Reno, Nevada - the epicenter of the lithium ion battery world. We test (and re-test... and re-test again) literally every battery we ship and all of our batteries come with an industry-leading 10 year warranty. We believe you should be as confident in your battery as we are.
27" RV Battery Lock Box - Aluminum Diamond Plate- Gloss Black
  • Gloss Black Diamond Plate Aluminum
  • Laser cut for precision protection
  • Corrosion resistant
  • Three optional knock out holes for different trailer configurations
  • Pre-drilled holes with self tapping bolts for easy installation

The Different types of batteries

Ion Lithium

Electrons in a lithium battery flow back and forth from anode to cathode to generate a charge in a solution of lithium salts. This deep cycle battery can be nearly entirely depleted without consequence and has the fastest recharge rate of any battery type. They weigh almost half as much as lead-acid batteries. All of these features combine to make them some of the best RV batteries for boondocking.

Pros

  • Usable capacity ranges from 80% to 100%.
  • Charge rates that are extremely high
  • There is no need for maintenance because there is no battery memory.
  • It is light.
  • Charge cycles ranging from 2,000 to 5,000

Cons

  • The most costly deep cycle battery option
  • At low temperatures, charging is not possible (but still performs better at low temperatures based on Battle Born Batteries Whitepaper)
  • A battery maintenance system is required (usually internal)

Time to Charge

  • Time to charge a lithium battery: 2 to 3 hours

Lithium-ion batteries are not the same as lead-acid batteries, whether sealed or flooded. Lithium batteries still have a cathode and anode, but lithium ions travel between them, usually in a solution of lithium salts.

Lithium battery cells come in a variety of shapes and sizes, including big and tiny cylinders (such as the ubiquitous 18650, 26650, and 32650 cells), soft plastic pouch cells, and plastic rectangle prismatic cells.

Lithium batteries come in a variety of chemistries, with the lithium iron phosphate battery being one of the safest, most stable, and longest-lasting options for RV use.

In comparison to other commonly used lithium battery types (such as lithium cobalt oxide batteries used in cell phones and laptops), lithium iron phosphate has a slightly lower energy density but is much less prone to thermal runaway, has a very flat discharge curve, and has the longest life of any lithium chemistry if well-maintained with good charging practices and moderate temperature.

There is no off-gassing, and these batteries can be depleted almost fully without causing long-term damage. They are also half the weight and less than half the volume of flooded lead-acid batteries, and they can accept extremely high charge rates (for example, 100A for a 100Ah battery).

Lead Acid Flooded

These deep cycle batteries are made up of lead plates that form “cells.” Each cell is filled with distilled water, which serves as the transfer substance and must be replenished on a regular basis. Lead-acid batteries are charged in phases, which leaves possibility for complications such as overcharging or undercharging. They are usually the cheapest option for a house battery and can be recharged multiple times, although they have a shorter life than AGMs and lithium batteries.

Pros

  • the least expensive
  • dependable tolerator of overcharging
  • Can provide a high current
  • It’s sold all throughout the world and is very easy to find.
  • Shelf life is indefinite.

Cons

  • Usable capacity ranges from 30% to 50%.
  • Extremely heavy
  • Monthly upkeep is required.
  • Gases are discharged with a charge efficiency ranging from 70% to 85%.

Time to Charge

  • Time to charge a lead acid battery: 8 to 16 hours

Overcharging, regular charging, and undercharging all have the following consequences:

  • When a battery is overcharged at a high voltage, electrolysis occurs, which decomposes the water into its main components of hydrogen and oxygen gas (this is referred to as “off-gassing”). Overcharging with an equalization charge is sometimes used to recover undercharged flooded lead-acid batteries to a fully operational state.
  • To keep a lead-acid battery completely charged, it is best to charge it in stages, usually with a bulk charge, an absorption or “topping” charge, and then a float charge. Even during normal charging, some off-gassing occurs, which is why lead-acid batteries require regular top-ups with distilled water. If this maintenance is not carried out, electrolyte levels can fall low enough to expose the plates, resulting in irreversible damage.
  • Inadequate charging, on the other hand, has the temporary consequence of not getting the battery up to full charge, and sustained inadequate charging can also lead to acid stratification, which is characterized by a layer of thicker electrolyte and layers of highly diluted electrolyte.

Gel

These deep cycle batteries, like AGMs, require no maintenance. They move electrolytes via a gel material made of sulfuric acid and silicate. They don’t produce gases, thus no ventilation is required for the batteries, but their charging rate is quite slow. These batteries can be found in electric wheelchairs and scooters.

Pros

  • It does not leak.
  • There is no need for upkeep.
  • There is no off-gassing.
  • Heat tolerance Charge efficiency of 85 to 90 percent

Cons

  • More expensive than lead acid or AGM
  • Cannot stand fast charging
  • Overcharging has the potential to damage it.
  • It has its own profile and setting.

Time to Charge

  • Charge time for gel: 5 to 10 hours

Glass Mat Absorbent (AGM)

The electrolytes in these deep cycle batteries travel through fiberglass between the plates of their cells. It is a “dry” battery, which means it requires no maintenance because it does not require distilled water. Their recharge rate is substantially faster than that of a lead-acid battery, but it is not as fast or efficient as that of a lithium battery.

Pros

  • Usable capacity ranges from 60% to 80%.
  • Charges at significantly higher rates than lead acid or gel Does not spill
  • There is no off-gassing.
  • There is no need for upkeep.
  • 95 percent charge efficiency
  • Cold temperatures have no effect on it.

Cons

  • More expensive than lead acid
  • Overcharging has the potential to damage it.

Time to Charge

  • Time required to charge an AGM: 5 hours

Maintenance

With the exception of lead-acid batteries, all deep cycle battery types do not require any maintenance. To maintain the plates in each cell immersed, distilled water must be topped off in lead-acid batteries on a monthly basis. Failure to do so renders the plates worthless, and the battery must be replaced.

If you are not going to use the batteries for an extended period of time, a trickle charger can be used to keep them charged. It is not necessary to utilize it with lithium batteries because they have their own internal battery management system.

Installation

The installation of deep cycle lead-acid, gel, and AGM batteries is the same. Simply connect the positive terminal to the positive wire from your coach and the negative terminal to the negative or ground wire from your coach, or if you have two or more batteries, wire them in parallel or series, depending on battery size (12 volt or 6 volt).

Lithium batteries are connected in the same fashion (positive to positive, negative to negative, or ground), however your RV will require a lithium-specific converter (charger). If your equipment already has a converter, make sure it can work with lithium batteries. Due to the voltage required, most ordinary converters will not be able to charge the lithium battery completely to 100 percent, but will be able to charge to roughly 80 percent full.

How Long Do Deep Cycle Batteries Last?

A good deep cycle lithium battery should endure between 3,000 and 5,000 charging cycles. So, depending on how frequently you recharge them, they might last anywhere from 3 to 20 years! Lead-acid batteries can last up to 6 years if properly maintained, while AGM batteries can last up to 6 years as well. Gel batteries can last 10 to 20 years because they have their own charging profile.

Option for Solar Charging

Solar panels can be used to charge any sort of deep cycle battery. To regulate the charge, solar systems often include a solar charge controller between the panel and the batteries. Most systems also feature a solar monitor, which allows you to see how much electricity the solar panels are producing and how much is remaining in your batteries.

FAQs

Where should the RV battery bank be located?

We recommend that you install your RV home battery bank in a sealed battery box within your camper van, preferably vented to the outside (lithium batteries do not require a sealed or vented box). If you keep your batteries at room temperature, not cold or hot, they will last a long time. Having an inside battery bank will help reduce the lengths of your wiring lines, keeping voltage drop low and saving you money on materials.

How can I connect batteries together?

Batteries can be connected in series or parallel, depending on whether a specific voltage is required for the battery bank. Most RV battery banks are 12-volt banks, which means they have either two 6-volt batteries put in series or two 12-volt batteries wired in parallel. Many 6-volt deep-cycle lead-acid batteries feature thicker plates than 12-volt deep-cycle batteries, which allows them to live longer. Batteries should be physically connected using very thick battery cables that are sized appropriately, typically 2/0 or 4/0 battery cables.

Can I connect different batteries together?

No, all batteries connected together must have the same type, model, and capacity, as well as the same age. They should also be in the same place and connected to the charging source with identically sized wiring (both in wiring gauge and length). Your camper van engine starter battery can be connected to the home battery bank by a battery isolator, battery combiner, or charging relay, allowing the house bank to be charged via alternator or the engine battery to be charged via solar.

Is an AGM battery a deep cycle battery?

All of these batteries are deep cycle, and they all employ AGM technology. Because they require little maintenance, AGM batteries are the favored form of deep cycle battery for many people. There are alternative designs that do the same function but in a different way.

How many years does a deep cycle battery last?

This is determined by the battery and its type. Most AGM batteries have a lifespan of 4 to 7 years. Various materials and construction methods can help to extend this, but few will endure more than ten years.

The way you utilize your battery will also have an impact on its lifespan. Deep discharges put the battery under more strain than light use. You will get the most life out of your battery if you never discharge it below 80%. If you discharge it at less than 50% of its capacity on a regular basis, expect the lifespan to be two years or less.

Can a deep cycle battery be overcharged?

Yes, a deep cycle battery can be overcharged. Overcharging, on the other hand, reduces the total capacity and lifespan of the battery, so you should avoid it if you want to get the most out of your purchase.

Getting the appropriate charger is the best method to avoid overcharging your battery. The majority of AGM batteries can be charged to 2.4 volts per cell. Reduce this to 2.25 volts per cell if you’re using a float charger. If it’s hot outside, reduce the charging voltage slightly. Warm batteries charge more quickly.