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SigmasTek  |  SKU: BW-1575

Best Power LI 2.5KVA Compatible Replacement Battery Set

Sale price $274.99 USD Regular price $393.06
Shipping calculated at checkout.

➤ Package contains 3 batteries for Best Power LI 2.5KVA

➤ AGM sealed battery technology for durability and performance

➤ Guaranteed compatibility with original Best Power UPS units

➤ UL certified for safety and quality

➤ 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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Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.
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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

Best Power LI 2.5KVA Replacement UPS Battery (Compatible with Best Power LI 2.5KVA)

Replace the batteries in your Best Power LI 2.5KVA with this reliable replacement UPS battery pack. This purchase includes three 12V 35AH AGM sealed batteries with NB terminals, designed to provide dependable backup power for your Best Power UPS. These UL certified batteries are a high-performance UPS battery option that meets or exceeds original manufacturer specifications for safe, consistent operation.

Key Specifications

  • Package contains: 3 batteries
  • Chemistry: SLA (Sealed Lead Acid)
  • Technology: AGM (Absorption Glass Mat)
  • Compatibility: Guaranteed compatibility with original battery set (Best Power LI 2.5KVA)
  • Warranty: 1-year Warranty
  • Volts: 12 V
  • Amp Hours: 35 AH
  • Weight: 74.1 Lbs (total package weight as listed)
  • Length: 7.72 In
  • Width: 5.14 In
  • Height: 6.14 In
  • Terminal: NB (Nut & Bolt)
  • Certification: UL (Underwriters Laboratories) certified
  • Brand / Spec Sheet: SigmasTek (replacement batteries sourced by ReplaceUPSBattery.com)
  • Shipping: UPS Ground and USPS; we ship in 1 business day for all in-stock items

Benefits

  • Durability: AGM sealed construction reduces maintenance and prevents leakage—built to withstand installation in UPS cabinets and enclosed systems.
  • Long life: These long-lasting battery units are designed to meet or exceed OEM performance, helping extend the usable life of your Best Power LI 2.5KVA and decreasing replacement frequency.
  • High performance: Reliable 12V 35AH output ensures stable backup for servers, networking equipment, and essential electronics during power interruptions.
  • Safety and quality: UL certification verifies adherence to recognized safety standards for stationary UPS applications.
  • Straightforward installation: NB terminal style and matching dimensions let you reuse original cables and hardware and install the batteries in the same configuration.
  • Applications: Ideal as a replacement UPS battery set for Best Power LI 2.5KVA systems and suitable for emergency power, telecom cabinets, data centers, and backup for tools and light equipment.
  • Quick shipping: In-stock items ship within one business day so you can restore backup power promptly.

Ready to secure reliable backup for your Best Power LI 2.5KVA? Order this 3-pack of 12V 35AH AGM replacement UPS batteries now. For assistance or questions, reach our customer service via email, chat, or call toll free at (800) 657-1303.


Payment & Security

Payment methods

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