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SigmasTek  |  SKU: BW-4860

Best Power LI 1.8KVA UPS High Performance Replacement Battery Set

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

➤ Replacement set with 2 SigmasTek SP12-35 NB batteries (12V, 35AH)

➤ High rate discharge ideal for Best Power LI 1.8KVA UPS applications

➤ Valve regulated, spill-proof for safe and maintenance-free use

➤ Low self-discharge and vibration resistance enhance durability

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


📦🚀 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

Replacement SigmasTek SP12-35 NB Batteries for Best Power LI 1.8KVA UPS

Maintain dependable backup power for your Best Power LI 1.8KVA Uninterruptible Power Supply with this compatible replacement UPS battery set. This set of two SigmasTek SP12-35 NB batteries is engineered for reliable high-rate discharge performance and consistent service life, making it a practical replacement choice for critical systems that require uninterrupted power during outages.

Key Specifications

  • Quantity: 2 batteries per set
  • Battery Model: SigmasTek SP12-35 NB
  • Voltage: 12 Volts
  • Capacity: 35 AH (Amp-hours)
  • Terminal Type: Nut & Bolt
  • Design: High Rate Discharge Design
  • Construction: Valve Regulated Spill Proof Construction (sealed)
  • Features: Low Self-discharge, High Vibration Resistance, Superior Performance
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year
  • Compatible With: Best Power LI 1.8KVA UPS

Benefits

These SigmasTek batteries offer the durability and performance required for a high-performance UPS battery replacement. The high rate discharge design handles short bursts of high current reliably, while the valve-regulated, spill-proof construction minimizes maintenance and safety concerns. Low self-discharge keeps the batteries ready for service after storage and reduces the need for frequent top-ups. High vibration resistance helps the cells remain stable and reliable in a variety of mounting environments.

Designed as a long-lasting battery alternative, this replacement set is well suited for Uninterruptible Power Supply (UPS) units, emergency power supply systems, and battery-powered tools. It’s an excellent solution for restoring runtime to small server rooms, networking equipment, telecom devices, surveillance systems, medical monitoring gear, and portable power tools where dependable backup is essential. With nut & bolt terminals, installation is straightforward when reusing existing cables and hardware from your original UPS configuration.

All battery sets are factory fresh and tested by knowledgeable technicians to ensure they meet or exceed OEM specifications. U.L. recognition and CE certification add layers of safety and regulatory compliance, and the included one-year warranty gives additional peace of mind.

Ready to replace your old batteries? Order the SigmasTek SP12-35 NB replacement UPS battery set for your Best Power LI 1.8KVA today. For assistance, call our customer support at . Buy now and get fast shipping on in-stock items—protect your equipment with a proven, high-performance UPS battery solution.



Payment & Security

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