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12V 8.5AH Battery YTX9-BS - Maintenance Free Dry

  • $47.99

12 Volt 8.5 Amp YTX9-BS Battery - Maintenance Free Dry AGM w/Acid Pack. Fits full-size scooters, mopeds, ATVs, dirt bikes, motorcycles, off-road vehicles and much more.

Replaces the Following Models: 26012-1261, 31500-156-001, 31500-HN1-003, 6MF8, CTX9-BS, ES9BS, GTX9-BS, M329BS, M429BS, PTX9-BS, XTAX9-BS, LTX9-BS

**Note: This product is a ORM-D (Other Regulated Item, Domestic) regulated item and ships via FedEx Ground to the lower 48 states only.

  • Length: 5.94 inches (151mm)
  • Width: 3.40 inches (88mm)
  • Height: 4.20 inches (107mm)
  • Includes Acid Pack
  • CCA (cold cranking amps): 120

Set-Up Instructions

All AGM battery electrolyte containers are not the same. Each contains the proper amount of electrolyte for its specific battery. Before filling, read the electrolyte handling instructions and precautions on the label. Do not smoke when activating a battery or handling battery acid. Always wear plastic gloves and protective eye wear and be sure to read the Battery Safety section in this manual. The following seven steps should be used to activate an AGM battery: 

 1. The battery must be out of the vehicle and placed on a level surface. 

 2. Remove electrolyte container from the plastic storage bag. Remove the strip of caps. Put the strip aside as you will use it later to seal the battery cells. For battery filling use only the dedicated acid container that comes with the battery as it contains the proper amount of electrolyte for that specific battery. This is important to service life and battery performance. Do not pierce, or otherwise open the foil seals on the electrolyte container. Do not attempt to separate the individual electrolyte containers. 

 3. Place the electrolyte container with the foil seals facing down into the cell filler ports on the battery. Hold the container level and push down to break the foil seals. Electrolyte will start to flow into the battery and air bubbles will be seen inside the container. Do not tilt the electrolyte container. 

 4. Check the electrolyte flow. Keep the container in place until it empties completely. If no air bubbles are coming up from the filler ports, or if container cells haven’t emptied completely after 20 minutes, tap the container and/or battery case a few times to cause the electrolyte to flow into the battery. Do not remove the acid container from the battery until it is completely empty. The battery requires all of the electrolyte from the container for proper operation. Bubbles will appear as the electrolyte container fills the battery indicating the flow of battery acid. Tap the container periodically to keep the electrolyte flowing until the container is completely empty. Never puncture the top of the acid container to speed up the filling process. 

 5. Remove the empty electrolyte container from the battery. Fully insert the strip of sealing caps (previously removed from the electrolyte container) into the battery filling ports. Make sure the strip of caps is fully inserted and flush with the top of the battery. Insert the caps by hand, do not use a hammer or excessive force. Never remove the strip of caps or add water or electrolyte to the battery during its service life. 

 6. For batteries with ratings of less than 18 AH, let the battery stand for 20 to 60 minutes. For batteries with higher AH ratings allow the battery to stand for 1 to 2 hours. Universal Parts AGM batteries have the amp hour (AH) printed on the front of the battery case. The stand, or rest period, allows the electrolyte to permeate into the plates for optimum performance. 

 7. Newly activated AGM batteries require an initial charge. After adding electrolyte, a new battery is approximately 75-80% charged. After the “stand” period (step 6), charge the battery to bring it to a full state-of charge. The battery charger used for initial charging should be able to charge at 12.8+-volts for an AGM battery.

FAQ Accordion with Animation

Frequently Asked Questions

When will my order be shipped and how long does delivery take?
Orders containing in-stock items typically ship within 3–5 business days. Orders that include assembly will require 7–10 business days to prepare. Please note that during the holiday season (Thanksgiving through Christmas), processing times may be longer due to high order volume. Once your order has shipped, you’ll receive an email with tracking information. Most orders are shipped via Less Than Truckload (LTL) freight and generally arrive within 3–7 business days. Deliveries to remote areas (such as mountains, forests, valleys, or islands) may take longer. You can check the estimated delivery date on the carrier’s website using the tracking number we provide.
How your vehicle is shipped?
Unless otherwise noted, the vehicles we offer are shipped crated or on a pallet and do not come assembled unless you’ve selected our assembly service. Assembly typically requires a few basic tools and mechanical knowledge. If you're not confident in your ability to safely assemble a high-speed off-road vehicle, we strongly recommend selecting professional assembly or having it assembled by a local mechanic.

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Do you offer financing?
Yes. Buy-now-pay-later financing is available with our preferred partner, BreadPay® (please see their icon under product pricing for details).

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How can I get assistance if I have question on products?
Please call 888-886-5846 and talk to one of our knowledgeable sales representatives between 9am-3pm PST. Or send us email at orders@gokartsusa.biz.
What warranty is included with my purchase?
You're covered with confidence at GoKarts USA®. Your satisfaction is our top priority. Every purchase comes with manufacturer-backed warranty protection—including up to 12 months of engine coverage—to keep your ride running strong. TrailMaster products also include a 6-month parts warranty for added peace of mind.

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What does 95% or 98% Assembly Mean? What do I need to assemble if shipped in crate?

For shipping safety, most vehicles cannot be fully assembled prior to delivery.

Minor assembly is required—this typically includes installing mirrors, connecting the battery, adjusting handlebars, and other small components. Before operation, please ensure all screws and fasteners are tightened, engine fluids are at proper levels, and the battery is fully charged. Your factory warranty remains valid right out of the box.

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