Deep cycle batteries are designed for sustained power delivery over long periods. Understanding each type helps you choose the right battery. Jetray Battery manufactures LiFePO4 deep cycle batteries for demanding applications.
What Is a Deep Cycle Battery?
A deep cycle battery is designed to be regularly discharged by 50-80% of its capacity. Unlike starter batteries which deliver short high-current bursts, deep cycle batteries have thicker plates to withstand repeated discharge and recharge. The Wikipedia article on deep cycle batteries explains the design differences. Choosing the right type directly impacts system performance and cost.
Flooded Lead-Acid
Flooded is the oldest and cheapest deep cycle battery type: Requires regular maintenance including checking electrolyte levels. Must remain upright. Needs ventilation due to hydrogen gas. Cycle life: 300-500 cycles at 50% DoD. Best for budget applications where maintenance access is available. Uses: solar backup, industrial equipment, off-grid systems.
AGM
AGM batteries use fiberglass mat to absorb electrolyte, making them spill-proof and maintenance-free. Can be mounted in any orientation. Lower internal resistance allows faster charging. Cycle life: 400-600 cycles at 50% DoD. Popular for RVs, marine, motorcycles, and UPS. Good cold temperature performance and vibration resistance.
Gel Cell
Gel batteries use silica to turn electrolyte into gel. Leak-proof and maintenance-free. Best deep discharge recovery among lead-acid types. Sensitive to charging voltage. Cycle life: 500-800 cycles at 50% DoD. Excels in golf carts, floor scrubbers, and renewable energy. The Wikipedia lead-acid article covers gel battery technology.
LiFePO4
LiFePO4 offers 2,000-5,000 cycles at 80% DoD, weighs 60-70% less than lead-acid, and requires zero maintenance. Built-in BMS protects against all electrical faults. Usable capacity is nearly 100%. Jetray’s LiFePO4 batteries range from 12V to 72V. Best for long-term value and demanding applications.
Cycle Life Comparison
| Type | Cycles (50% DoD) | Service Life |
|---|---|---|
| Flooded | 300-500 | 3-5 years |
| AGM | 400-600 | 4-6 years |
| Gel | 500-800 | 4-7 years |
| LiFePO4 | 3,000-7,000 | 8-15 years |
Cost Comparison
Initial cost per Ah: Flooded $0.50-1, AGM $1-2, Gel $1.50-2.50, LiFePO4 $2.50-5. Cost per cycle over lifetime strongly favors LiFePO4. Over 10 years, LiFePO4 costs 40-60% less than any lead-acid type. Jetray provides custom battery solutions for optimized value.
Maintenance Requirements
Flooded: High — monthly water checks and equalization. AGM: Low — terminal cleaning only. Gel: Low — requires correct charger. LiFePO4: Zero — BMS handles everything. For remote installations, LiFePO4’s zero-maintenance is a major advantage.
Application Recommendations
Solar storage: LiFePO4 or Gel. RV and marine: LiFePO4 or AGM. Golf cart: LiFePO4 or Gel. UPS: LiFePO4 or AGM. Off-grid: LiFePO4 or Flooded. Jetray provides application-specific recommendations for all types.
Comparison Table
| Factor | Flooded | AGM | Gel | LiFePO4 |
|---|---|---|---|---|
| Maintenance | High | Low | Low | None |
| Cycle life | 300-500 | 400-600 | 500-800 | 2,000-5,000 |
| Weight (100Ah) | 28 kg | 26 kg | 27 kg | 12 kg |
| Usable capacity | 50% | 50% | 50-60% | 80-100% |
| Cost per cycle | $$$ | $$ | $$ | $ |
FAQ
What is the best deep cycle battery type?
LiFePO4 is best overall for most applications due to longest life, lowest weight, zero maintenance, and lowest lifetime cost.
Can I use AGM as deep cycle?
Yes, AGM is suitable for deep cycle applications with maintenance-free operation and good performance at moderate cost.
How long do deep cycle batteries last?
Flooded: 3-5 years. AGM: 4-6 years. Gel: 4-7 years. LiFePO4: 8-15 years.
What is the difference between deep cycle and starter?
Deep cycle batteries have thicker plates for sustained discharge. Starter batteries deliver short high-current bursts for engine starting.
Find Your Perfect Deep Cycle Battery
Jetray offers all deep cycle types with expert support. Explore our range or contact us for a free consultation.
