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SigmasTek  |  SKU: BW-4903

Best Power BAT-0053 UPS High Performance Replacement Battery

Sale price $92.48 USD Regular price $134.10
Shipping calculated at checkout.

➤ OEM SLA specifications met or exceeded for Best Power BAT-0053

➤ Advanced AGM technology for stable and consistent power

➤ Maintenance-free and spill-proof for hassle-free use

➤ U.L. Recognized and CE Certified for trusted quality

➤ 1 year warranty with full compatibility guaranteed


📦🚀 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 BAT-0053 Replacement Battery — Compatible with Best Power BAT-0053

Designed for seamless compatibility with the Best Power BAT-0053, this replacement UPS battery delivers dependable backup power, proven safety features, and maintenance-free operation. Meeting or exceeding OEM SLA specifications, it is an ideal solution for ensuring uninterrupted operation of network gear, point-of-sale systems, and small server environments. Its AGM construction and high-rate discharge capability make this a high-performance UPS battery suited for demanding power events.

Key Specifications

  • Absorbent Glass Mat (AGM) Technology
  • High Rate Discharge Design
  • Maintenance-Free Design with Spill Proof Construction
  • U.L. Recognized and CE Certified
  • Brand New, Factory Fresh
  • 1 Year Warranty
  • Application: Emergency Power Supply
  • Application: Battery Powered Tools
  • SigmasTek
  • 12 Volts
  • 35 AH
  • Nut & Bolt
  • Best Power
  • Replacement for: Best Power BAT-0053

Benefits

This replacement UPS battery combines rugged reliability with low maintenance needs, offering consistent performance under heavy loads and during emergency events. As a long-lasting battery option, its AGM design prevents leaks, reduces corrosion risk, and simplifies installation. The BAT-0053 replacement is purpose-built to supply steady current with fast response, protecting sensitive electronics from sudden outages and voltage drops.

Its broad applicability extends beyond UPS units to include emergency power supplies and battery-powered tools, making it a flexible choice for both commercial and residential applications. Certifications such as U.L. recognition and CE compliance underscore the commitment to safety and regulatory adherence, while the manufacturer-backed one-year warranty provides additional assurance against defects.

If you’re seeking a reliable, high-performance UPS battery that will restore your Best Power BAT-0053 to optimal protection levels, this replacement is an excellent match. It offers the balance of performance, safety, and value needed to keep mission-critical systems online.

Don’t wait until power interruption costs you time or data — add this Best Power BAT-0053 replacement UPS battery to your order now and ensure continuous protection for your equipment.


Payment & Security

Payment methods

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