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Group 24 Starting Battery Guide: 480CCA and 100 Min Reserve
Short answer: A Group 24 starting battery is a full-size 12V battery that pairs solid cranking power with extra reserve capacity, and the Pro-Guide 12V 480CCA Group 24 Flooded Starting Battery (PGD24GC) delivers 480 cold cranking amps and 100 minutes of reserve capacity in a 10 1/4 x 6 13/16 x 8 7/8 in case weighing 34 lb. That is the most reserve capacity of any Pro-Guide flooded starting battery, which makes it a strong pick for gas golf carts that run lights and accessories. It carries a 12-month free replacement warranty.
Group 24 is one of the most common 12V battery sizes, but not every Group 24 battery is built for the same job. This guide explains what a Group 24 starting battery is, what 480 CCA and 100 minutes of reserve capacity mean in practice, how to check fitment and terminal layout before you buy, how flooded compares with AGM and lithium, and how to charge and maintain a flooded battery for a long service life.
Key Takeaways
- Most reserve capacity in the line: 100 minutes at 25 amps, the highest of Pro-Guide's flooded starting batteries.
- Solid starting power: 480 cold cranking amps (CCA).
- Standard Group 24 case: 10 1/4 x 6 13/16 x 8 7/8 in (260.4 x 173 x 225.4 mm), 34 lb (15.4 kg).
- Familiar layout: round top posts with the positive on the left when you face the front label.
- Covered: 12-month free replacement warranty.
What Is a Group 24 Starting Battery?
"Group 24" is a case-size standard from the Battery Council International (BCI). It describes the outside dimensions and general terminal layout, not the chemistry or power rating. Group 24 is one of the most widely used 12V sizes, so trays, battery boxes and hold-downs for it are easy to find.
A Group 24 case can hold very different batteries. Deep cycle Group 24 batteries are built to be drained and recharged over and over, while a Group 24 starting battery is built to deliver a short, heavy burst of current to crank an engine and then be recharged by the charging system. The Pro-Guide PGD24GC is the starting kind.
It is a flooded lead-acid design, the traditional construction with plates immersed in liquid electrolyte. Compared with Pro-Guide's compact Group 26 and Group 70 starting batteries, the larger Group 24 case gives the PGD24GC more reserve capacity, at the cost of a longer, taller and heavier battery.
Pro-Guide PGD24GC Specifications
| Model / SKU | Pro-Guide 12V 480CCA Group 24 Flooded Starting Battery (PGD24GC) |
| Chemistry | Flooded lead-acid |
| Voltage | 12V |
| BCI group size | 24 |
| Cold cranking amps | 480 CCA |
| Reserve capacity | 100 minutes at 25 amps |
| Amp-hour rating | Not rated (starting battery) |
| Terminals | Round top posts, positive on the left facing the front label |
| Dimensions (L x W x H) | 10 1/4 x 6 13/16 x 8 7/8 in (260.4 x 173 x 225.4 mm) |
| Weight | 34 lb (15.4 kg) |
| Warranty | 12-month free replacement |
Want the full numbers? Download the PGD24GC data sheet (PDF).
The PGD24GC uses a standard Group 24 case with round top posts, so it drops into common Group 24 trays and boxes.
What Does 100 Minutes of Reserve Capacity Get You?
Reserve capacity explained
Reserve capacity (RC) is the number of minutes a fully charged battery can supply a steady 25 amps before its voltage drops to 10.5 volts. The PGD24GC is rated for 100 minutes, compared with 90 minutes for the Pro-Guide Group 70, 80 for the Group 26 and 70 for the Group 26G. More RC means a bigger cushion when the engine is off or the charging system can't keep up with your accessories.
| Load | Rough estimate on the PGD24GC |
| 25A accessory load, engine off | About 100 minutes to 10.5V |
| Light accessory load, such as LED lights or a radio | Longer than 100 minutes, depending on the draw |
| Engine start | Up to 480A at 0°F for a few seconds per start |
These are rough estimates. Temperature, battery age and state of charge all affect real results, and running a starting battery flat repeatedly shortens its life. Treat RC as a safety margin.
Cold cranking amps explained
Cold cranking amps (CCA) measure starting power. In the BCI test, CCA is the current a fully charged 12V battery can deliver for 30 seconds at 0°F while holding at least 7.2 volts. The PGD24GC's 480 CCA is plenty for many small gas engines. Always check that it meets or exceeds the CCA your owner's manual or old battery label calls for; if you need more, the Pro-Guide Group 70 offers 550 CCA in a smaller side-terminal case.
How to Check Group 24 Fitment and Terminals
- Measure length, width and height. The PGD24GC is 10 1/4 in long, 6 13/16 in wide and 8 7/8 in tall. Check height clearance under seats, lids and hold-down bars.
- Match the terminal layout. Facing the front label, the positive post is on the left and the negative on the right. Make sure your cables reach without stretching.
- Match the terminal style. Round top posts take standard clamp-style cable ends.
- Check the CCA requirement. Confirm 480 CCA meets or exceeds your engine's requirement.
- Plan the mounting. The case has a molded ledge at the base for a hold-down clamp. If you need a tray or box, the NOCO Group 24 Battery Tray and NOCO Group 24 Snap-Top Battery Box are sized for Group 24.
Group 24 Flooded vs. AGM vs. Lithium
Group 24 comes in every chemistry. Here is how they typically compare for starting duty.
| Factor | Flooded (Pro-Guide PGD24GC) | Typical Group 24 AGM starting | Typical Group 24 lithium starting |
| Up-front cost | Lowest | Higher | Highest |
| Maintenance | Periodic checks; keep vent caps tight and level | Sealed | Sealed |
| Orientation | Upright only; do not tip | Spill-resistant | Spill-proof |
| Weight | 34 lb for this model | Often similar or heavier | Usually much lighter |
| Charging | Standard 12V lead-acid charger | AGM setting recommended | Lithium profile required |
| Best fit | Cost-effective starting with accessory reserve | Vibration, less upkeep | Weight savings, long life, premium budget |
For a gas cart or small engine that just needs dependable starting and a good accessory cushion, flooded Group 24 is the value choice. If weight or zero maintenance matters more, compare Pro-Guide cranking and starting batteries and starting lithium batteries. Looking for deep cycle power instead? Read our Group 24 lithium battery guide.
What Is the PGD24GC Best For?
- Gas golf carts with a Group 24 tray: Pro-Guide designed this battery for gas-powered golf carts, and its 100 minutes of reserve capacity help carts that run lights, radios and other 12V accessories.
- Accessory-heavy setups: the most reserve capacity of any Pro-Guide flooded starting battery gives you the biggest buffer when the engine is off.
- Replacing a Group 24 starting battery: a direct swap when your old battery is a Group 24 with top posts and the positive on the left.
- Other Group 24 starting jobs: engines whose manual calls for a 12V Group 24 starting battery at or below 480 CCA.
It is not a deep cycle battery, so it is not meant for electric golf carts or trolling motors. For electric carts, see our golf cart batteries.
The top label confirms the 24GC model, 480 CCA and 100-minute reserve capacity. The vent caps sit between the positive (left) and negative (right) posts.
How to Charge a Group 24 Flooded Battery
In normal use, the engine's charging system keeps the battery charged. Use a charger when the cart sits for long periods, after a run-down battery, or before storage.
- Use a 12V lead-acid charger. The Pro-Guide 12V 10A 1-Bank Battery Charger handles charging stages automatically and can maintain the battery in storage.
- Select the flooded or standard mode if your charger offers one. Do not use a lithium-only profile.
- Ventilate. The label warns that explosive gases can cause blindness or injury. Charge away from sparks, flames and smoking.
- Connect positive first, negative second, and disconnect in reverse.
- Check resting voltage. A fully charged 12V flooded battery typically rests around 12.6 to 12.7 volts a few hours after charging. About 12.4 volts or lower generally means it needs charging.
If you get stuck with a dead battery, a NOCO 1,000 Amp UltraSafe Lithium Jump Starter can start the engine without a second vehicle. Fully recharge the battery afterward.
Install and Maintenance Tips
Keep it upright with the vent caps tight
The PGD24GC has vent caps across the top. The label says do not tip and keep vent caps tight and level. Install it upright and secure it so it can't shift.
Check electrolyte if your caps are removable
Flooded batteries can lose some water over time, especially in hot weather or with heavy charging. If the caps on your battery are removable, check that the plates stay covered and top up with distilled water only, after charging, while wearing eye protection.
Clean and protect the terminals
Corrosion on the posts can cause slow cranking. Clean posts and clamps with a wire brush, tighten the clamps snugly, and apply battery corrosion preventative spray.
Charge before storage
Lead-acid batteries self-discharge, and sitting partly charged leads to sulfation. Charge fully before storing, then keep a smart maintainer connected or recharge about monthly.
Lift carefully
At 34 lb, the PGD24GC is the heaviest of Pro-Guide's flooded starting batteries. Lift with your legs and keep it level.
Group 24 vs. Group 26: Which Should You Choose?
Both are Pro-Guide flooded starting batteries with round top posts and a 12-month warranty. The trade-off is size versus reserve capacity:
| Spec | PGD24GC (Group 24) | PGD26GC (Group 26) |
| Cold cranking amps | 480 CCA | 500 CCA |
| Reserve capacity | 100 min | 80 min |
| Dimensions | 10 1/4 x 6 13/16 x 8 7/8 in | 8 3/16 x 6 13/16 x 7 3/4 in |
| Weight | 34 lb | 27 lb |
Choose the Group 24 if your tray takes the longer case and you want the most reserve capacity for accessories. Choose the Group 26 if space is tight or you want slightly more cranking power in a smaller, lighter battery. Side-terminal cables? Look at the Group 70 550CCA.
Frequently Asked Questions
What size is a Group 24 starting battery?
The Pro-Guide PGD24GC measures 10 1/4 x 6 13/16 x 8 7/8 in (260.4 x 173 x 225.4 mm) and weighs 34 lb (15.4 kg). Confirm height clearance in your tray.
How many CCA does a Group 24 starting battery have?
It varies by brand and model. The Pro-Guide PGD24GC is rated at 480 cold cranking amps and 100 minutes of reserve capacity.
What is the difference between a Group 24 starting battery and a Group 24 deep cycle battery?
They share a case size but do different jobs. A starting battery like the PGD24GC delivers short bursts of high current to crank an engine; a deep cycle battery delivers steady power over hours and handles repeated deep discharges.
Can I use the PGD24GC in an electric golf cart?
No. The PGD24GC is a starting battery designed for gas golf carts. Electric carts need deep cycle batteries.
Which side is the positive terminal on the PGD24GC?
With the front label facing you, the positive post is on the left and the negative post is on the right.
How do I charge a flooded Group 24 battery?
Use a 12V lead-acid charger on its flooded or standard setting in a ventilated area. A fully charged flooded battery typically rests around 12.6 to 12.7 volts.
What warranty comes with the Pro-Guide Group 24 starting battery?
The PGD24GC comes with a 12-month free replacement warranty.
Get a Dependable Group 24 Starting Battery
If your gas golf cart or engine takes a Group 24, the Pro-Guide PGD24GC gives you 480 cold cranking amps and the most reserve capacity in Pro-Guide's flooded starting line, 100 minutes, in a standard top-post case. It is backed by a 12-month free replacement warranty and a team that can help you confirm fitment before you order. The Pro-Guide PGD24GC is sold through our dealer network, so call us at 1-800-827-3232 and we will point you to the closest dealer.
VIEW THE PRO-GUIDE GROUP 24 480CCA
Need help choosing? Call our team at 1-800-827-3232 or browse all lead-acid batteries and golf cart batteries.
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