SigmasTek ST5L-BS
SigmasTek ST5L-BS Motorcycle Battery User Manual
Comprehensive guide for installation, operation, and maintenance of your SigmasTek ST5L-BS Motorcycle Battery.
1. Product Overview
The SigmasTek ST5L-BS is a high-quality replacement battery designed for various motorcycles and powersports units. It is an AGM (Absorbent Glass Mat) Maintenance Free battery, delivered fully charged and ready for immediate installation. This battery is engineered to provide optimal cranking amps and superior performance, especially where high power output is required over short periods.

Figure 1.1: The SigmasTek ST5L-BS motorcycle battery, showcasing its compact design and terminal layout.
Key Features:
- Replacement Compatibility: Directly replaces YTX5L-BS, GTX5L-BS, GT5L-BS, UT5L, CYTX5L-BS, PTX5L-BS, PTX5LBS-FS, and WP5L-BS battery models.
- CCA Rating: Provides 80 Cold Cranking Amps for reliable starting power.
- AGM Maintenance Free: Sealed design eliminates the need for water refills and reduces self-discharge.
- Ready to Install: Shipped fully charged, allowing for immediate use upon receipt.
- Guaranteed Compatibility: Ensures seamless integration with OEM battery specifications.
- Long Service Life: Designed for durability and extended operational lifespan.
2. Specifications
Detailed technical specifications for the SigmasTek ST5L-BS battery are provided below to assist with compatibility and performance understanding.

Figure 2.1: Official specifications table for the SigmasTek ST5L-BS battery, including voltage, capacity, CCA, and operating temperatures.
| Attribute | Value |
|---|---|
| Model Number | ST5L-BS |
| Nominal Voltage | 12V |
| Nominal Capacity (10HR) | 4.5AH |
| Cold Cranking Amps (CCA) | 80 |
| Battery Type | Valve Regulated Lead-Acid Battery, AGM Design |
| Dimensions (Length x Width x Height) | 4.49 x 2.80 x 4.21 inches (114 x 71 x 107 mm) |
| Approximate Weight | 4.14 pounds (1.88 kg) |
| Operating Temperature Range (Discharge) | -20°C (-4°F) to 50°C (122°F) |
| Operating Temperature Range (Charge) | -20°C (-4°F) to 50°C (122°F) |
| Operating Temperature Range (Storage) | -20°C (-4°F) to 40°C (104°F) |
| UPC | 179676755511 |

Figure 2.2: Visual representation of the SigmasTek ST5L-BS battery with its key dimensions labeled for accurate fitment.
3. Setup and Installation
Before installing your new SigmasTek ST5L-BS battery, please read these instructions carefully. Always prioritize safety during installation.
Safety Precautions:
- Wear appropriate personal protective equipment (PPE), including safety glasses and gloves.
- Ensure the vehicle's ignition is off and the key is removed.
- Avoid contact with battery terminals and ensure no metal objects bridge the terminals.
- Do not smoke or allow open flames near the battery.
- Keep children and pets away from the battery and installation area.
Installation Steps:
- Locate the Battery Compartment: Refer to your vehicle's owner's manual to find the battery location.
- Disconnect Old Battery:
- First, disconnect the negative (-) terminal cable (usually black).
- Next, disconnect the positive (+) terminal cable (usually red).
- Carefully remove any battery hold-down straps or clamps.
- Remove Old Battery: Carefully lift the old battery out of the compartment. Be mindful of its weight.
- Clean Battery Tray and Cables: Inspect the battery tray for corrosion or debris and clean as necessary. Clean the battery cable terminals with a wire brush if corroded.
- Place New Battery: Carefully place the SigmasTek ST5L-BS battery into the battery compartment, ensuring it sits securely.
- Connect New Battery:
- First, connect the positive (+) terminal cable to the positive (+) terminal on the new battery. Tighten securely.
- Next, connect the negative (-) terminal cable to the negative (-) terminal on the new battery. Tighten securely.
- Secure Battery: Reinstall any battery hold-down straps or clamps to prevent movement during operation.
- Verify Connections: Double-check all connections to ensure they are tight and secure.
The SigmasTek ST5L-BS battery is maintenance-free and comes fully charged, so no initial charging or acid filling is required before installation.
4. Operation
Once installed, the SigmasTek ST5L-BS battery operates as a standard motorcycle battery, providing power for starting and running your vehicle's electrical systems. As an AGM battery, it offers reliable performance and is designed to withstand vibrations common in motorcycle applications.
Normal Operation:
- The battery will be charged by your vehicle's charging system during engine operation.
- Ensure your vehicle's charging system is functioning correctly to prevent overcharging or undercharging, which can affect battery lifespan.
- Avoid excessive discharge of the battery, such as leaving lights on when the engine is off, as this can shorten its life.
5. Maintenance
While the SigmasTek ST5L-BS is an AGM Maintenance Free battery, regular checks can help ensure its longevity and optimal performance.
Recommended Maintenance Practices:
- Terminal Inspection: Periodically check battery terminals for cleanliness and tightness. Corrosion can be cleaned with a mixture of baking soda and water, followed by rinsing with clean water and drying. Ensure terminals are securely fastened.
- Battery Case Inspection: Inspect the battery case for any signs of damage, cracks, or swelling. A damaged case can indicate internal issues or improper charging.
- Voltage Check (Optional): If you have a multimeter, you can periodically check the battery's voltage. A fully charged 12V AGM battery should read around 12.8V to 13.0V when resting.
- Storage: If the vehicle will be stored for an extended period (e.g., off-season), it is recommended to disconnect the battery or use a trickle charger/battery maintainer designed for AGM batteries to prevent deep discharge. Store the battery in a cool, dry place.
- Cleaning: Keep the top of the battery clean and dry to prevent current leakage and corrosion.
6. Troubleshooting
This section addresses common issues you might encounter with your motorcycle battery and provides potential solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Engine cranks slowly or not at all | Low battery charge; Loose or corroded battery terminals; Faulty starter motor; Issues with vehicle's charging system. | Charge the battery using an appropriate charger; Clean and tighten battery terminals; Have the starter motor and charging system (alternator/regulator) inspected by a professional. |
| Battery drains quickly | Parasitic drain (electrical components drawing power when vehicle is off); Faulty charging system; Old or defective battery. | Check for accessories left on; Inspect vehicle's electrical system for shorts or faulty components; Test charging system output; If battery is old, consider replacement. |
| Battery appears swollen or bulging | Overcharging; Internal damage. | Immediately disconnect the battery. This indicates a serious issue. Do not attempt to charge or use. Have the vehicle's charging system checked and replace the battery. Dispose of the old battery safely. |
| Corrosion on terminals | Normal chemical reaction; Loose connections; Overcharging. | Clean terminals with a wire brush and baking soda solution; Ensure connections are tight; Check charging system. |
If you are unable to resolve an issue after following these steps, it is recommended to consult a qualified motorcycle mechanic or contact SigmasTek customer support.
7. Warranty and Support
The SigmasTek ST5L-BS Motorcycle Battery comes with a 6-month warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use and service.
Warranty Claims:
For warranty claims or technical support, please retain your proof of purchase and contact the seller or SigmasTek directly. Do not attempt to repair the battery yourself, as this will void the warranty.
Further Assistance:
For additional information or to explore other SigmasTek products, you may visit the official SigmasTek Store on Amazon:
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