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No, not every AGM battery is a deep cycle battery. AGM describes how the battery holds its electrolyte in glass mat, while deep cycle describes how the battery is built to discharge and recharge over and over. The listings in this guide show both sides, with the sections below walking through how to tell them apart.
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The quick answer: are all agm batteries deep cycle
Are all AGM batteries deep cycle? No. AGM stands for Absorbed Glass Mat, a construction type in which the electrolyte sits in glass mat, and deep cycle is a duty type built for repeated discharge and recharge. Some AGM batteries are deep cycle batteries, some are starting batteries, and some are dual purpose. The Renogy listing calls its battery a deep cycle battery in the title, while the ACDelco listing calls its battery a marine AGM battery with deep cycle performance. Read the title, the discharge current and the cycling claims before you decide.
What AGM means
AGM means the electrolyte is absorbed in glass mat rather than loose liquid, and the listings state what that gives you. The ACDelco listing states AGM technology with no water required, no spills, no leaks, and a pressurized valve system that prevents dry-out and acid damage to the terminals. The Renogy listing states a sealed design with an integrated internal structure, which spares you from intricate internal troubleshooting. The ACDelco listing also states high density plate oxide for maximum power-per-pound and dependable high cycling service, with heavy top lead and large through-partition connections for power output, durability and vibration resistance. None of that makes a battery deep cycle on its own; it describes how the battery is built.
What deep cycle means
Deep cycle means the battery is built to discharge deeply and recharge again and again, and the Renogy listing states the figures for it. It is a 12V 100Ah AGM battery with a 1100A max discharge current for 5 seconds, a self-discharge rate below 3% at 77°F (25°C), and a discharge temperature range of -4 to 140°F / -20 to 60°C. It supports series connections with no limitation and parallel connections up to 4P, and the maker states over 230,000 units sold worldwide in the past six years. The listing states a 2-year prorated material and workmanship warranty, a weight of 63.8 pounds, and dimensions of 13.9 by 6.9 by 8.6 inches. Those figures describe a battery built for steady discharge in RVs, campers, cabins, homes, marine use and off-grid systems, not a battery built only for a short burst of starting power.
| Feature | Renogy 12V 100Ah AGM | ACDelco M24AGM |
|---|---|---|
| Capacity | 100Ah | Not stated |
| Max discharge | 1100A for 5 seconds | Not stated |
| Self-discharge | Below 3% at 77°F | Not stated |
| Temp range | -4 to 140°F / -20 to 60°C | Not stated |
| Parallel | Up to 4P | Not stated |
| Warranty | 2-year prorated | 24-month |
| Weight | 63.8 pounds | 45.67 pounds |
| Size | 13.9 by 6.9 by 8.6 inches | 10.2 by 8.7 by 6.9 inches |
How to tell from the listing
Start with the title. The Renogy title reads Deep Cycle Battery, which states the duty plainly. The ACDelco title reads Marine AGM BCI Group 24 Battery, which states the group size and the marine use, and its bullets claim deep cycle performance rather than naming the battery a deep cycle battery. Next, read the cycling claims: the ACDelco listing states dependable high cycling service, and the Renogy listing states deep cycle use for solar, RV, camper, cabin, home, marine and off-grid systems. Then read the discharge current: the Renogy states 1100A max discharge for 5 seconds, which the listing presents as power for most appliances, including a fridge, microwave, CPAP, coffee maker, laptop and more. A starting battery states a high cranking current instead, and a deep cycle battery states capacity and cycling. Finally, read the warranty and the group size: the ACDelco states a 24-month warranty and BCI Group 24 sizing, and the Renogy states a 2-year prorated warranty.
Ways to check before you buy
- Read the title for Deep Cycle wording, as in the Renogy listing.
- Read the discharge current: 1100A for 5 seconds on the Renogy.
- Read the cycling claim: high cycling service on the ACDelco, deep cycle use on the Renogy.
- Read the self-discharge rate: below 3% at 77°F on the Renogy.
- Read the warranty: 24-month on the ACDelco, 2-year prorated on the Renogy.
- Read the group size: BCI Group 24 on the ACDelco.
FAQ: power away from the grid
Are all AGM batteries deep cycle?
No. AGM describes the glass mat construction, and deep cycle describes the duty. The Renogy listing calls its battery a deep cycle battery, while the ACDelco listing calls its battery a marine AGM battery with deep cycle performance.
What is the difference between AGM and deep cycle?
AGM is a construction type with the electrolyte held in glass mat, and deep cycle is a duty type built for repeated discharge and recharge. A battery can be AGM without being deep cycle, and a deep cycle battery can use another construction.
Can a deep cycle AGM battery power home appliances?
The Renogy listing states a 1100A max discharge current for 5 seconds and presents the battery as power for most appliances, including a fridge, microwave, CPAP, coffee maker, laptop and more.
How do I know if an AGM battery is deep cycle?
Look for Deep Cycle wording in the title, a cycling claim such as high cycling service, and a stated discharge current, as in the Renogy listing.
Related solar guides
See all Batteries and Charging guides and every Deep Cycle and RV Batteries guide.
