Merits Pioneer 3 S135 U1 High-Performance Replacement Battery Set
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🔹 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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Battery Care Guide
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
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
⚠️ 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 | 35 AH
Terminal Type
Nut & Bolt
Merits Pioneer 3 S135 U1 Replacement Battery (12V 35AH NB) - 2-Pack
Keep your Merits Pioneer 3 S135 U1 wheelchair powered and dependable with this OEM-compatible 2-pack replacement battery set. Designed specifically for the Merits Pioneer 3 S135 U1, these 12V 35AH batteries deliver reliable performance, strong discharge capability, and a wide operating temperature range. If you need a trusted replacement battery that meets or exceeds original specifications, this high-performance battery set offers durability and consistent power for daily use.
Key Specifications
- Package contains: 2 batteries
- Volts: 12
- Amps (AH): 35
- Weight: 49.4Lbs
- Length: 7.72
- Width: 5.14
- Height: 6.14
- Terminal: NB (Nut & Bolt)
- Maintenance-free
- Spill Proof
- SLA Chemistry
- AGM Technology
- Guaranteed compatibility with original batteries
- 1-year Warranty
- Brand: SigmasTek
- Shipping Methods: UPS Ground and USPS
- We ship in 1 business day for all in-stock items
Benefits
These Merits Pioneer 3 S135 U1 replacement batteries are engineered to deliver a long-lasting battery life and steady power output that keep your wheelchair running smoothly. The AGM and SLA chemistry provide a maintenance-free, spill-proof design that is safer and more convenient than flooded lead-acid cells. With a high discharge design and wide operating temperature tolerance, this high-performance battery performs reliably under varied conditions, minimizing downtime and keeping mobility devices ready when needed.
Durability is built into every cell: robust construction and proven chemistry extend cycle life so you get consistent capacity over months and years. Typical applications include wheelchair power systems, mobility scooters, and other medical mobility devices where dependable reserve capacity and safe, leak-resistant operation are essential. These batteries are also suitable for emergency backup, light UPS systems, and portable power needs associated with mobility equipment.
Installation is straightforward — replace the batteries in the original configuration and reuse your existing cables. Be sure to verify dimensions against your current batteries prior to ordering, as manufacturer specifications can change.
Ready to restore full mobility? Order this Merits Pioneer 3 S135 U1 replacement battery 2-pack today for a reliable, high-performance battery solution with a 1-year warranty and fast shipping.
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