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SigmasTek  |  SKU: BW-9261

Merits Pioneer 3 S135 High Performance Wheelchair Replacement Battery

Sale price $227.99 USD Regular price $348.84
Shipping calculated at checkout.

➤ Factory fresh Merits Pioneer 3 S135 batteries for reliable performance

➤ 100% compatible with your Merits Pioneer 3 S135 wheelchair model

➤ AGM technology and valve regulated spill-proof design for safety

➤ Designed for deep cycle use ensuring long-lasting power and durability

➤ Includes 1-year warranty and certified for quality and performance


📦🚀 FAST SHIPPING: Usually ships same day if ordered before 2 PM EST

⚠️ Quick Reminder

🔹 Please ensure the original battery model number is listed in our product description and that your device model number matches for compatibility.
🔹 We only supply the batteries shown in the images. Device images are provided for reference only.

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Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.
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Battery Care Guide

Battery Usage and Maintenance Guidelines 🔋

Please read the following instructions carefully before using your new battery. Proper adherence will help ensure optimal performance and extended service life.

1. Cordless Phones, PDAs, and Power Tools (NiMH, NiCd, Lithium-Ion) 📱

Initial Charge

  • Fully charge the battery overnight prior to first use.

Conditioning (First 2–6 Charge Cycles)

  • Operate the device until the battery reaches approximately 20% capacity.
  • Avoid premature recharging.
  • Do not allow the battery to fully discharge during the initial cycles.

Post-Conditioning

  • Recharge the battery only when necessary.
  • These batteries are capable of approximately 500 charge cycles:
  • Once daily → ~500 days
    Twice daily → ~250 days
    Note: Even a partial recharge is considered a full cycle.

2. Sealed Lead Acid (SLA) Batteries 💡

  • No conditioning required.
  • Maintain the battery in a fully charged state; avoid complete discharge.
  • Capable of 300–400 charge cycles.
  • Expected service life: 2–3 years, depending on usage conditions.

3. Laptop Batteries (Lithium-Ion) 💻

Initial Charge

  • Fully charge the battery overnight prior to first use.

Conditioning (First 2–6 Charge Cycles)

  • Charge fully, then discharge to approximately 20% capacity.
  • Avoid complete discharge, as some devices may not detect a fully drained battery.

Post-Conditioning

  • Minimize frequent plugging and unplugging.
  • Allow the battery to discharge moderately at least once per month to maintain optimal performance.
  • Occasional cycling is recommended to sustain battery health.

Professional Recommendation

Adhering to these guidelines will enhance battery longevity and ensure reliable performance.

For further assistance regarding your battery or order, our customer support team is available to provide guidance.

Delivery and Shipping

Everything You Need to Know About Shipping with BatteryWeb (USA)

We know reliable delivery matters when you need power fast. Here’s how BatteryWeb makes shipping easy across the USA:

🚚 Shipping & Delivery

Most orders ship next business day (some products like sealed lead acid may take a little longer).

Same-day shipping available if you order before 11:59 AM (delivery depends on the carrier).

We ship nationwide using FedEx, UPS, USPS, DHL, and regional ground carriers.

Shipping costs are calculated automatically at checkout based on weight, distance, and carrier.

Transit times shown are estimates only (business days, no weekends/holidays).

🌍 Shipping Restrictions

Lithium batteries cannot be shipped by USPS or air. They must go via FedEx Ground, UPS Ground, or DHL Ground.

PO Box deliveries are only available via USPS.

At this time, we do not ship lithium batteries to Puerto Rico. NiMH, NiCd, and Alkaline can be shipped.

📦 Important Notes

Double-check your shipping address! If an incorrect address is used and the order is returned, re-shipping costs are the buyer’s responsibility.

If a product is temporarily out of stock, we’ll notify you right away with the expected restock date—or issue a refund if you prefer.

💲 Currency & Pricing

All prices are shown in USD.

Orders shipped outside the USA may be subject to local taxes, customs fees, or import duties. These are the buyer’s responsibility.

⚡ At BatteryWeb, we’re committed to getting your batteries delivered quickly, safely, and affordably—so you’ll always have the power you need, when you need it.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

🔹 Our products are generic replacement parts and are not affiliated with, endorsed by, or manufactured by the original equipment manufacturers (OEMs).


Volts & Amps

12 Volts | 40 Ah

Terminal Type

Nut & Bolt

Merits Pioneer 3 S135 Replacement Battery - Compatible with Merits Pioneer 3 S135

Keep your Merits Pioneer 3 S135 running smoothly with a trustworthy replacement battery designed specifically for mobility use. These brand new, factory-fresh replacement batteries are fully compatible with the Merits Pioneer 3 S135 and offer dependable deep cycle performance, safety certifications, and maintenance-free convenience.

Key Specifications

  • Model Compatibility: Merits Pioneer 3 S135
  • Required Quantity: 2 batteries (SP12-40 NB)
  • Voltage: 12 Volts
  • Amp-Hours: 40 Ah
  • Terminal Type: Nut & Bolt
  • Battery Technology: Absorbent Glass Mat (AGM)
  • Designed For: Deep cycle usage
  • Construction: Valve regulated, spill proof
  • Energy Density: High power/volume ratio
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand new, factory fresh
  • Performance: Performance guaranteed
  • Brand: SigmasTek
  • Warranty: 1 Year Warranty

Benefits

This replacement battery is built to provide long-term reliability and consistent output. AGM technology ensures a sealed, vibration-resistant, and maintenance-free battery that minimizes the chance of spills and corrosion. As a high-performance battery intended for deep cycle use, it sustains dependable voltage throughout extended operation and charges efficiently for repeated use.

Expect enhanced durability and a long-lasting battery life that supports daily mobility needs. These batteries are ideal for electric wheelchairs, power chairs, mobility chairs, and mobility scooters, offering steady power for outings and indoor use alike. They are also suitable for backup power in UPS systems, emergency power setups, and certain portable tools where dependable deep cycle performance is required.

Backed by UL and CE certifications and a one-year warranty, the SigmasTek SP12-40 NB (12 V 40 AH) units are performance guaranteed and sold brand new. If your Merits Pioneer 3 S135 requires SP12-40 NB batteries, this is a direct-fit replacement—simply reuse your existing cables and hardware to install.

Ready to replace your old batteries with a long-lasting, high-performance replacement battery for your Merits Pioneer 3 S135? Buy now and keep your mobility device powered and ready.


Payment & Security

Payment methods

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