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SigmasTek  |  SKU: BW-4855

Best Technologies LI 1.8KVA UPS High Performance Replacement Battery Set

Sale price $165.64 USD Regular price $209.20
Shipping calculated at checkout.

➤ Includes 2 fresh SigmasTek SP12-35 NB batteries (12V, 35AH) for LI 1.8KVA

➤ High rate discharge design for enhanced UPS power output

➤ Valve regulated and spill-proof for safe, hassle-free operation

➤ Low self-discharge and vibration resistance improve reliability

➤ Certified quality with U.L., CE, and 1 year warranty coverage


📦🚀 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 | 35 AH

Terminal Type

Nut & Bolt

SigmasTek SP12-35 NB Replacement Battery Set for Best Technologies LI 1.8KVA UPS

Revitalize your Best Technologies LI 1.8KVA Uninterruptible Power Supply with this compatible replacement UPS battery set. These SigmasTek SP12-35 NB batteries provide reliable, factory-fresh capacity and are engineered to meet the demands of backup power systems. If you want a high-performance UPS battery that delivers predictable runtimes and a long service life, this replacement set is tailored for those needs.

Key Specifications

  • Includes: 2 x SigmasTek SP12-35 NB batteries (battery set of 2)
  • Voltage: 12 Volts
  • Capacity: 35 AH (Amp-hours)
  • Terminal Type: Nut & Bolt
  • Design: High Rate Discharge Design
  • Construction: Valve Regulated Spill Proof Construction
  • Features: Low Self-discharge
  • Durability: High Vibration Resistance
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year Warranty
  • Brand: SigmasTek

Benefits

This replacement battery set combines durability, safety, and dependable power delivery. The high rate discharge design allows the Best Technologies LI 1.8KVA to handle brief periods of elevated power demand, making these batteries suitable for surge protection and short-run emergency loads. Valve regulated, spill-proof construction minimizes maintenance and reduces the risk of leakage, while low self-discharge helps maintain readiness over long storage intervals.

High vibration resistance contributes to a longer operational life in environments with mechanical stress. Certified by U.L. and CE, these batteries meet recognized safety and quality benchmarks and are supplied brand new with a 1-year warranty for peace of mind. Common applications include Uninterruptible Power Supply (UPS) units, Emergency Power Supply backups, and Battery Powered Tools that require reliable bursts of power. As a long-lasting battery option, this set provides consistent performance where continuity counts.

Be sure to reuse all existing cables and hardware from your original setup when installing these replacement batteries into your Best Technologies LI 1.8KVA UPS. For assistance with fitment or installation, our support team is available to help ensure a correct and safe replacement process.

Purchase your SigmasTek SP12-35 NB replacement UPS battery set for the Best Technologies LI 1.8KVA today to secure dependable backup power, competitive pricing, and fast shipping for in-stock items.



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