A BCI Group GC2 SLI battery is a 6-volt lead-acid battery standardized by the Battery Council International (BCI) for starting, lighting, and ignition (SLI) in vehicles. Measuring approximately 10″ x 7″ x 11″, it’s widely used in golf carts, RVs, and marine systems. With capacities around 200–220Ah, GC2 batteries are often wired in series (two 6V units) for 12V applications. Their rugged design supports high cyclic endurance but requires regular maintenance like water topping and terminal cleaning.
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What applications use GC2 SLI batteries?
GC2 SLI batteries power electric golf carts, solar storage systems, and marine equipment due to their 6V design and deep-cycle capability. With 200–220Ah capacity, they’re ideal for sustained low-current draws, unlike standard car batteries optimized for short bursts. Pro Tip: Pair two GC2s in series for 12V setups in RVs to balance weight distribution.
Golf carts rely on GC2 batteries due to their ability to handle 1,000+ charge cycles. Beyond mobility, marine systems use them for trolling motors, while off-grid solar setups leverage their deep-cycle resilience. For example, a golf cart using six GC2s (36V total) can run 30–50 miles per charge. Technical specs include post terminals for secure connections and vented lids to manage off-gassing. However, their weight (60–70 lbs each) complicates installation. Why choose GC2 over lithium? Cost and compatibility with legacy charging systems. Transitional phrase: While lithium batteries offer longer lifespans, GC2 remains a budget-friendly workhorse.
How does GC2 differ from other BCI group sizes?
GC2 batteries are 6V units with tall, narrow dimensions, while groups like GC8 (8V) and GC12 (12V) serve higher voltage needs. Key distinctions include terminal placement (top vs. side) and Ah ratings, which affect compatibility with battery trays and chargers.
The BCI group system categorizes batteries by physical size and electrical specs. GC2’s 10″ x 7″ x 11″ dimensions contrast with GC12’s 13″ length, making it unsuitable for tighter compartments. Voltage is another divider: GC8 and GC12 eliminate the need for series connections but cost 30–50% more. Technical specs reveal GC2’s 20–22Hr discharge rate, ideal for prolonged use, versus GC12’s focus on compact 12V power. Imagine needing to replace a flashlight battery: using two GC2s (6V each) in series is like stacking two D-cells for 3V. Transitional phrase: However, newer EVs increasingly favor lithium, squeezing out legacy lead-acid designs.
| Group | Voltage | Typical Use |
|---|---|---|
| GC2 | 6V | Golf carts, RVs |
| GC8 | 8V | Commercial EVs |
| GC12 | 12V | Boats, small EVs |
What are the voltage and capacity specs?
GC2 SLI batteries deliver 6V nominal voltage and 180–220Ah capacity at 20-hour discharge rates. Their 1,000+ cycle life (50% DoD) suits daily deep cycling, unlike standard SLI batteries optimized for shallow discharges.
A single GC2 provides 6V, but most applications require pairs (12V) or triples (18V). Capacity hinges on discharge rate: at 75Ah draw, runtime drops 40% versus 20A. Real-world example: A 36V golf cart with six GC2s (6x6V) offers ~7.2kWh energy, enabling 4–5 hours of continuous use. Technical specs include lead-calcium grids reducing water loss and 600–800 CCA (cold cranking amps) for reliable starts. But why prioritize Ah over CCA? Deep-cycle applications depend on sustained energy, not instant power. Transitional phrase: Still, CCA matters for marine engines in cold climates.
| Parameter | Spec | Impact |
|---|---|---|
| Voltage | 6V | Requires series wiring |
| Capacity | 220Ah | Longer runtime |
| CCA | 800A | Cold weather starts |
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FAQs
No—always replace all batteries in a series string. Mixing old and new units creates imbalances, reducing capacity and lifespan.
How often should I check water levels?
Inspect every 30 charging cycles. Use distilled water to refill, never tap water—minerals corrode lead plates.
