Battery Equivalents and Replacements

Group GC2 and Group GC2H - 6 Volt Golf Cart Batteries

BCI Group GC2 and Group GC2H batteries are heavy-duty, deep cycle batteries commonly used in golf carts and other automotive applications.

Also, they are often used as deep cycle batteries in marine applications, off-the-grid applications, for powering medical and security systems, and similar.

Although they are by definition 3-cell 6V batteries, GC2 and GC2H batteries are sometimes offered as 12V batteries (mostly lithium 4-cell batteries) for building 24V, 36V, and 48V battery packs with fewer batteries.

Published: May 10, 2021.

gc2 battery m

BCI Group GC2 and Group GC2H Batteries Features and Specifications

BCI Group GC2 and Group GC2H batteries are very similar batteries, differing practically only in dimensions (L x W x H):

- Group GC2: 10 3/8 x 7 3/16 x 10 7/8 inches (10.375 x 7.1875 x 10.875 inches, 264 x 183 x 277 mm),

- Group GC2H: 10 3/8 x 7 3/16 x 11 5/8 inches (10.375 x 7.1875 x 11.625 inches, 264 x 183 x 295 mm).

Note: Groups GC2 and GC2H feature very similar physical dimensions as Groups GC8 and GC8H respectively, except that GC2 and GC2H batteries feature nominal voltage of 6V and GC8 and GC8H feature nominal voltage of 8V.

As one can see, GC2 and GC2H batteries feature the same length and width, but the GC2H group is 1 inch (25.4 mm) taller than the GC2 group.

However, in real life, many manufacturers label their batteries as 'GC2' batteries, although they are as tall as GC2H batteries - golf cart battery compartments and other similar battery compartments are "almost always" tall enough in order to accommodate GC2H batteries with some room left. And because of this "almost always", it is recommended to always check the actual size of the battery compartment and the size of batteries before ordering a new set of batteries.

GC2 and GC2H Battery Types and Chemistries

vmax xtr6 235 gc2

Most GC2 batteries are 3-cell 6-volt lead-acid batteries, although Lithium Iron Phosphate (LiFePO4) batteries are also being offered as 4-cell 12-volt batteries.

Traditionally, lead-acid GC2 batteries are heavy-duty, deep-cycle wet/flooded batteries - since they are required to cycle a lot during use, they are build using heavy, thick plates which can often withstand 1000+ cycles down to 50% DoD, which is an excellent result for lead-acid batteries.

But, wet/flooded lead-acid batteries are not maintenance-free batteries and are being replaced by spill-proof, maintenance-free AGM and Gel-Cell lead-acid batteries, although wet/flooded are still being used very often.

AGM and Gel-Cell batteries are often designed to allow recombination of up to, sometimes even more than 99% of generated oxygen and hydrogen into water, and as such don't require periodical checks.

However, wet/flooded GC2 batteries generally still hold the edge regarding the number of supported charging/discharging cycles.

battle born bbgc2

Lithium Iron Phosphate (LiFePO4) GC2 batteries support 3000-4000 cycles down to 90-100% DoD and offer other benefits, including:

- much lighter battery pack (30-50% by weight, when compared with similar lead-acid battery packs), leading to weight savings and less strain on motors and batteries in general,

- faster recharging than lead-acid batteries,

- more stable output voltage,

- they are maintenance-free batteries that can be mounted in any position,

- they don't release any gasses,

- very low self-discharge rate, etc.

However, lithium batteries are initially more expensive, but they save money and effort in the long run.

Number of Required Batteries

The number of required batteries depends on the required voltage:

- 12V systems: 2 (two) 6V batteries or 1 (one) 12V battery,

- 24V systems: 4 (four) 6V batteries or 2 (two) 12V batteries,

- 36V systems: 6 (six) 6V batteries or 3 (three) 12V batteries,

- 48V systems: 8 (eight) 6V batteries or 4 (four) 12V batteries.

Note: when connecting the lead-acid batteries in series or parallel, it is highly recommended to connect the very same batteries from the same manufacturer, preferably from the same batch.

Similarly, when connecting lithium batteries in parallel and/or series, always use the very same batteries from the same manufacturer, preferably from the same batch, IF and only IF such connections are allowed and explicitly written by the manufacturer of those lithium batteries!

GC2 Batteries Comparison Chart

The following comparison chart lists some of the most popular GC2 batteries, with their most important features and specifications:

Model Battery Chemistry Voltage (V) / Capacity (Ah)
RC (min)
Amstron GC2 AGM 6V, 210Ah
475 min @25A; 124 min @75A
68 lbs; 30.8 kg
Battle Born BBGC2 LiFePO4 12V, 100Ah
240 min @25A
31 lbs; 14.1 kg
Fullriver DC224-6 GC2 AGM 6V, 224Ah
441 min @25A; 113 min @75A
70 lbs; 31.7 kg
Mighty Max ML200-6 AGM 6V, 200Ah
63.5 lbs; 28.8 kg
NPP NP6-225Ah AGM 6V, 225Ah
68.2 lbs; 30.9 kg
PowerStar Crown CR220 Flooded/Wet 6V, 220Ah
~60 lbs; ~27.2 kg
Trojan T-105 Flooded/Wet 6V, 225Ah
447 min @25A; 115 min @75A
64 lbs; 29.0 kg
Trojan T-125 Flooded/Wet 6V, 240Ah
488 min @25A; 132 min @75A
66 lbs; 29.9 kg
62.4 lbs; 28.3 kg
U.S. GC2 US2200XC2 Flooded/Wet 6V, 232Ah
474 min @25A; 122 min @75A
61.8 lbs; 28.0 kg
VMAX LFPGC2-12175XTR LiFePO4 12V, 175Ah
420 min @25A
38.5 lbs; 17.5 kg
VMAX V6-225 GC-2 AGM 6V, 225Ah
500 min @25A; 125 min @75A
72 lbs; 32.6 kg
VMAX XTR6-235 GC-2 AGM 6V, 235Ah
500 min @25A; 130 min @75A
78 lbs; 35.3 kg

Note: Amazon links in the chart ('Model' column) open in the new windows, feel free to check them for the most up-to-date prices and offers.

As one can see, lead-acid GC2 batteries feature a nominal voltage of 6 volts and 20h capacity in the 200-260 Ah range. Also, they are able to provide 25 Amps for up to 500 minutes and 75 Amps for up to 130 minutes.

Lithium GC2 batteries are offered as 12V batteries that feature 100-175 Ah capacity, but with new models emerging on the market rather quickly, one can expect these numbers to change very soon.

Lead-Acid vs Lithium GC2 Batteries

trojan t 105 gc2 batteryWe have already mentioned several advantages and disadvantages of the lead-acid and lithium GC2 batteries, but we have to write one example to further explain the similarities and differences of these battery types.

In this example, we will compare 'classic' Trojan T-105 flooded lead-acid batteries with VMAX LFPGC-12175XTR lithium battery - both batteries connected in series to create 48 volts golf cart battery pack:

- number of batteries: 8 (eight) Trojan T-105, 4 (four) VMAX LFPGC-12175XTR batteries,

- weight of the battery pack: 512 lbs (~232 kg) Trojan T-105, 154 lbs (~70 kg) - weight saving 358 pounds (~162 kg),

- rated capacity @25A: ~186 Ah Trojan T-105, ~175 Ah VMAX LFPGC-12175XTR. When the current draw is increased, the actual capacity of Trojan T-105 is decreased much faster.

- rated capacity @75A: Trojan T-105 battery pack can provide 75A for 115 minutes (almost two hours) with an average power of 3.4-3.7 kW. VMAX LFPGC-12175XTR battery pack can provide 75 Amps slightly more than 2+ hours - the exact number is not provided by the VMAXTANKS.

Note: VMAX LFPGC-12175XTR can provide continuously 100A and 350A for 3 seconds, setting the maximum output power of such battery pack to ~5 kW continuously, and ~17 kW for 3 seconds.

- number of charging/discharging cycles: VMAX LFPGC2-12175XTR battery supports up to 4000 cycles down to 90% DoD (@35A, 25°C) and 6000 cycles down to 80% DoD (@35A, 25°C), while Trojan T-105 can withstand 1200 cycles down to 50% DoD and "premium line" Trojan T-105 RE can withstand 1600 cycles down to 50% DoD and 1000 cycles down to 80% DoD which are both exceptional values for the lead-acid battery.

- charging: Trojan T-105 battery pack can be recharged using any suitable lead-acid battery charger, although an intelligent battery charger with temperature compensation and wet/flooded battery charging mode is highly recommended. VMAX LFPGC2-12175XTR battery pack requires a dedicated lithium CC/CV (Constant Current/Constant Voltage) battery charger or a lead-acid battery charger with the dedicated charging mode for lithium batteries.

Note: If You are considering switching your golf cart from lead-acid to lithium batteries, check the battery charger You already have - maybe You will have to replace it as well.

As one can see, switching from lead-acid to lithium batteries can lead to some serious weight savings, extended golf cart range, and offers the battery pack that can withstand much more charging/discharging cycles. But, the price is initially higher ...

vmax lfpgc2 12175xtr

Long Story Short: GC2 and GC2H batteries are commonly used as heavy-duty, deep cycle batteries in marine, automotive, and light industrial applications where a strong and reliable power source is required.

Thanks to the advancements in technology, lithium GC2 batteries are slowly replacing lead-acid batteries in light vehicle applications, but lead-acid batteries are still being used thanks to their lower price (at least initially) and simplicity.

For heavy-duty applications, if the lithium batteries are too expensive, consider wet lead-acid batteries with heavy and thick plates, if their maintenance is not of an issue.

For the maintenance-free lead-acid batteries, consider AGM GC2 batteries, just be sure not to discharge them below 80% DoD, preferably not below 50% DoD.