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SigmasTek  |  SKU: BW-9210

Merits MP3W High Performance Replacement Battery for Wheelchair

Sale price $156.99 USD Regular price $240.13
Shipping calculated at checkout.

➤ Factory fresh Merits MP3W wheelchair battery with high-quality construction

➤ 100% compatible replacement for Merits MP3W units using SP12-55 NB (12V 55AH)

➤ Absorbent Glass Mat (AGM) technology ensures deep cycle performance and durability

➤ Valve regulated, spill-proof design for safe and reliable use in mobility devices

➤ Comes with a 1-year warranty and guaranteed performance for long-lasting power


📦🚀 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 | 55 AH

Terminal Type

Nut & Bolt

Merits MP3W Replacement Battery — SP12-55 NB

Restore power to your Merits MP3W wheelchair with this brand-new replacement battery designed for perfect compatibility. This SP12-55 NB unit provides 12 Volts and 55 AH of deep-cycle energy in an AGM, valve-regulated package, making it a dependable, high-performance battery option. Ideal for daily mobility needs, this replacement battery offers the long-lasting battery life and safety certifications necessary for worry-free operation.

Key Specifications

  • Compatible Model: Merits MP3W
  • Part Number: SP12-55 NB
  • Voltage: 12 Volts
  • Capacity: 55 AH
  • Technology: Absorbent Glass Mat (AGM) Technology
  • Usage Type: Designed For Deep Cycle Usage
  • Construction: Valve Regulated Spill Proof Construction
  • Energy Density: Power/Volume Ratio Yielding Unrivaled Energy Density
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year Warranty
  • Brand: SigmasTek
  • Terminal Type: Nut & Bolt

Benefits

  • Durability: The AGM, sealed design provides vibration resistance and spill-proof operation for reliable use in mobility equipment.
  • Long Life: Specifically designed for deep-cycle applications, this battery provides extended service life and consistent capacity through many cycles.
  • High Performance: High energy density and efficient construction make this a high-performance battery that supports sustained operation and responsive power delivery.
  • Certified & Safe: U.L. recognition and CE certification ensure compliance with quality and safety standards.
  • Multiple Uses: While matched to the Merits MP3W, this battery is also well suited for electric wheelchairs, power chairs, mobility scooters, UPS backups, emergency power deployments, and compatible tool systems.
  • Hassle-Free Swap: Replace using your existing cables and hardware for a straightforward installation that gets you back on the move quickly.
  • Warranty Protection: Backed by a 1-year warranty and delivered brand-new, this replacement battery gives reliable value and support.

Ready to upgrade your Merits MP3W with a dependable replacement battery? Purchase this long-lasting battery today for a high-performance solution with quick shipping on in-stock inventory. Order now and restore the power and reliability your mobility device depends on.


Payment & Security

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