For questions, quotes, or help finding the right battery, feel free to email us at sales@batteryweb.com

New collections added! Learn more

🎉 First Order Special 🎉

First-time shoppers get 5% OFF on batteries & accessories!

WELCOME5
SigmasTek  |  SKU: BW-9208

Merits P3021-MP3RW Deluxe Gemini High Performance Replacement Battery for Wheelchair

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

➤ Factory fresh Merits P3021-MP3RW Deluxe Gemini wheelchair battery for reliable power

➤ 100% compatible with your original Merits P3021-MP3RW Deluxe Gemini unit

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

➤ Deep cycle battery ideal for electric wheelchairs, power chairs, and mobility scooters

➤ Includes 1-year warranty ensuring guaranteed performance and long battery life


📦🚀 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.

📸 Send Your Battery Photo / Unsure? Expert Help

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.
POST YOUR IMAGE

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 P3021-MP3RW Deluxe Gemini Replacement Battery — SP12-55 NB

Replace your Merits P3021-MP3RW Deluxe Gemini battery with confidence using this factory-fresh replacement battery. Designed for full compatibility with the Merits P3021-MP3RW Deluxe Gemini, this 12 Volt 55 AH unit offers dependable performance, deep-cycle capability, and the safety features required for daily use. If you want a high-performance battery that restores range and reliability, this replacement battery delivers the long-lasting battery life you need.

Key Specifications

  • Compatible Model: Merits P3021-MP3RW Deluxe Gemini
  • 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: AGM design and valve-regulated construction make this battery robust against vibration, shock, and everyday wear for dependable service in mobility devices.
  • Long Life: Engineered for deep-cycle use, the battery supports extended discharge cycles so you can count on extended runtime between charges.
  • High Performance: High energy density means efficient power delivery in a compact package, ensuring your power chair or scooter maintains performance under load.
  • Certified Safety: U.L. recognition and CE certification confirm this unit meets recognized safety and manufacturing standards.
  • Wide Applications: While tailored for the Merits P3021-MP3RW Deluxe Gemini, this replacement battery is also suitable for electric wheelchairs, power chairs, mobility chairs, mobility scooters, UPS backup, emergency power systems, and compatible portable tools.
  • Plug-and-Play Compatibility: 100% compatible with existing wiring—install using your original cables and hardware for a straightforward swap.
  • Peace of Mind: Brand-new condition plus a 1-year warranty provides protection and value for your investment.

Ready to upgrade or replace your Merits P3021-MP3RW Deluxe Gemini battery? Purchase this high-performance battery now for dependable, long-lasting battery life and swift shipping on in-stock items. Take action today to restore mobility and reliability.


Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.