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SigmasTek  |  SKU: BW-5135

APC SU48XLBP UPS Compatible Replacement Battery Set

Sale price $155.20 USD Regular price $225.03
Shipping calculated at checkout.

➤ Set of 4 new SigmasTek SP12-18HR batteries (12V 18AH)

➤ High rate discharge design supports short bursts of power

➤ Valve regulated and spill-proof for leak-free performance

➤ Low self-discharge enhances shelf life and reliability

➤ Tested to exceed OEM specs, includes 1 year warranty


📦🚀 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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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 | 18 Ah

Terminal Type

Nut & Bolt

Replacement Battery Set for APC SU48XLBP — SigmasTek SP12-18HR (4-Pack)

Keep your APC SU48XLBP running at peak performance with this replacement UPS battery set featuring four SigmasTek SP12-18HR batteries (12 Volts, 18 AH). Specially selected and factory tested for UPS applications, these brand new batteries provide the steadiness and low-maintenance reliability required to maintain emergency power readiness across a wide range of installations.

Key Specifications

  • Brand: SigmasTek
  • Model: SP12-18HR
  • Quantity: 4 batteries (set)
  • Voltage: 12 Volts
  • Capacity: 18 AH (Amp-hours)
  • Terminal Type: Nut & Bolt
  • Design: High Rate Discharge Design
  • Construction: Valve Regulated Spill Proof
  • Self-discharge: Low Self-discharge
  • Vibration Resistance: High Vibration Resistance
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year
  • Compatibility Note: Requires use of all existing cables and hardware from original configuration
  • Intended Use: APC SU48XLBP

Benefits

  • Engineered Durability: Valve regulated, spill-proof construction and high vibration resistance help these batteries endure demanding operational environments typical of UPS installations.
  • Long Service Life: Low self-discharge and quality manufacturing extend the usable life of the pack, making this a reliable long-lasting battery choice for mission-critical backup systems.
  • High Output Capability: The high rate discharge design supplies the short-duration, high-current output needed during transfer and surge events, classifying this as a high-performance UPS battery for APC SU48XLBP.
  • Compliant & Tested: U.L. recognition and CE certification, plus factory testing by our technical staff, provide assurance that these batteries meet strict performance and safety criteria.
  • Flexible Usage: Ideal for Uninterruptible Power Supplies, emergency power systems, and suitable battery-powered tools with matching specifications.
  • Simple Replacement Process: Supplied as a complete, tested replacement set — installation uses your original cables and hardware for a straightforward swap.

Restore dependable backup power to your APC SU48XLBP with this tested replacement UPS battery set. Order today to secure a long-lasting, high-performance UPS battery solution — and reach out to our support team if you need assistance. In-stock orders typically ship within 24 hours.


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