Costco Deep Cycle Batteries Top 5 List

Deep cycle batteries are an absolutely essential element for providing electrical storage in a variety of renewable energy systems.


It is an absolute necessity if you ever want to use your electricity at a time when the system itself isn’t actually producing it.

A deep cycle battery bank can help to access your electricity if you are on a solar array system when a sunny day turns to night.

The batteries you decide to use will never be 100 percent effective or efficient when compared to a photovoltaic system, though they can help in producing sustainable, long-term energy alternative.

We’re here to tell you which Costco deep cycle batteries will work best for your system!

The 5 Best Bets

Vmax Tanks - Vmaxslr125 AGM Deep Cycle 12v 125ah SLA rechargeable Battery

The Vmax Tanks AGM Deep Cycle 12v rechargeable battery is an excellent choice for use with Pv solar panels, smart chargers, wind turbines, or inverters.

These ultra high quality batteries with military grade plates guarantee a lifespan of 8-10 years.

If you need something that is durable and safe without any dangerous fumes or gases, it will definitely meet your needs!

The 75-pound battery comes with an attached nylon handle to make it easy to carry and it is designed for 99 percent of recombination abilities.

This is a perfect battery for an array of uses from small to large.

Universal - UB121000-45978 12v 100AH Deep Cycle AGM Battery

The Universal 12v 100AH Deep Cycle AGM Battery is another excellent choice when you need a versatile battery as it can be mounted in any position and can be transported by air or ground without any sort of handling regulations.

 It also requires absolutely no maintenance whatsoever!

This battery is a leak and spill proof battery and also valve regulated, making it a safe and hazard-free battery to work with.

As a 60lb battery, it is a bit lighter than the Vmax Tanks, and luckily, just as reliable for extreme use applications.

ExpertPower 12v 33ah Rechargeable Deep Cycle Battery

The ExpertPower 12v 33ah Rechargeable Deep Cycle Battery at only 27 pounds is easily one of the best and most trustworthy lead acid batteries on the market for anything from home application to machine mobility to personal use.

This battery is extremely versatile and provides as an excellent power source with its’ rugged construction and strong resistance to shock, vibration, chemicals, and heat.

It is an incredible 10-hour deep cycle battery that allows for a quick and easy installation that is maintenance free!

Built to last, this battery will get your system and applications up and running quickly and painlessly!

Mighty Max Battery - ML35-12 - 12V 35AH U1 Deep Cycle

If you’re looking for an even lighter battery to deliver power to your applications, look no further than the 23 pound Mighty Max ML35 12V Deep Cycle Battery.

With a state of the art, heavy duty, calcium alloy grid, it is designed for a long life and exceptional performance!

You will never have to worry about safety risks, as this battery is spill proof and resistant to shock and vibration in a very wide range of temperatures.

This Mighty Max Battery even has a high discharge rate and deep discharge recover rate, providing a relevant amount of power in any situation.

At a fair price with a full 1-year warranty, this maintenance free battery is well worth the purchase!

Mighty Max Battery - ML18-12 - 12V 18AH CB19-12 SLA AGM Rechargeable Deep Cycle

The Mighty Max ML18-12 12V Deep Cycle Battery is a rechargeable model that allows you discharge deeper than other batteries in the same tier, allowing you to push more power without the fear of needing to charge it very often.

This battery is suitable for boats, motorcycles, tools, toys, and anything else with a mid-size quality.

With the highly absorbent polyester design that holds the cells under pressure, as well as the valve regulated design that prevents leaks that are so common in lead acid batteries, you’ll never have to worry about a spill!

This extremely high quality 12v battery, at only 12 pounds, will ensure a fun and stress free time when using it to power up.


What are some of the most important factors in considering what Deep Cycle Battery I should purchase? 

A battery with a higher Reserve Capacity (RC) or Ampere Hours (AH) are more likely to have a longer life because of their thicker plates. Check the RC on a battery label before purchasing.

The Manufacture Date is very important as well. Buying a lead acid battery older than 3 months can puts the battery at risk for sulfate and buying an AGM battery older than 12 months will put you at risk for buying a battery with a lower state-of-charge.

What is the difference between a flooded battery and a Valve Regulated Battery?

Flooded batteries are either low maintenance more commonly, or maintenance free (sealed). While the maintenance free don’t require any preventative maintenance, have far less water loss, and have a faster charge compared to low maintenance, these batteries are typically more prone to deep discharge, or failure, because of their construct. Maintenance free batteries are typically more expensive as well. In terms of Valve Regulated batteries, they are spill proof, completely maintenance free, and have a far longer shelf life. The main con is the initial high cost.

Any tips on how to properly store my batteries?

Your best bet is to store in a cold, dry place, as anywhere with heat will speed up the discharging process and eventually kill your battery if steps are not taken to recharge.

Is there anyway to test a Deep Cycle Battery?

 Inspect the battery first for any problems. This can include corrosion, loose cables, wet battery top, etc. Make sure the battery is recharged to a 100% state of charge and that you are completely rid of the surface charge, as that can be a deceiving factor in determining the life and quality of the battery. Finally, measure the state of charge by using a BCI state of charge chart.