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SigmasTek  |  SKU: BW-4859

Best Power LI 2.0KVA UPS High Performance Replacement Battery Set

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

➤ Set of 2 replacement batteries (12V, 35AH) for Best Power LI 2.0KVA UPS

➤ High rate discharge design supports short-term high power output

➤ Valve regulated, spill-proof construction for safe use and no leaks

➤ Low self-discharge and vibration resistant for extended reliability

➤ U.L. recognized, CE certified, and 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 | 35 AH

Terminal Type

Nut & Bolt

Replacement SigmasTek SP12-35 NB Batteries for Best Power LI 2.0KVA UPS

Bring your Best Power LI 2.0KVA Uninterruptible Power Supply back to full capability with this compatible replacement UPS battery set. The two SigmasTek SP12-35 NB batteries included are factory fresh and optimized for high-rate discharge performance, delivering the dependable backup power required by demanding UPS environments. This replacement UPS battery pack is a smart choice for protecting servers, communications gear, and critical systems that depend on continuous power.

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 2.0KVA UPS

Benefits

As a high-performance UPS battery option, this SigmasTek set supports short bursts of elevated power demand, allowing your Best Power LI 2.0KVA UPS to perform reliably during outages and transitional power events. The sealed, valve-regulated construction makes these batteries spill-proof and maintenance-free, while low self-discharge ensures they remain ready when needed. High vibration resistance enhances durability, especially in rack or mobile installations.

These long-lasting battery replacements are suitable for Uninterruptible Power Supply (UPS) units, emergency power supply systems, and battery-powered tools. Typical uses include backup for servers and network devices, emergency lighting, telecom equipment, and portable power applications. Because the set uses nut & bolt terminals, you can reuse the existing cables and hardware from your original configuration for secure and proper installation.

We personally test each replacement battery set to guarantee superior performance that meets or exceeds OEM specifications. With U.L. and CE recognition and a one-year warranty, you get both safety and assurance with every purchase.

Upgrade your Best Power LI 2.0KVA UPS with these SigmasTek SP12-35 NB replacement UPS batteries today. Order now for fast processing and contact our customer service at if you need assistance choosing or installing your new batteries.



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