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SigmasTek  |  SKU: BW-5574

Enersys HX540-12FR High Performance UPS Replacement Battery

Sale price $548.32 USD Regular price $795.06
Shipping calculated at checkout.

➤ Genuine EnerSys HX Series 12HX505 battery with high-rate discharge

➤ Long standby life and deep cycle capability

➤ Absorbent Glass Mat and flame retardant case for safety

➤ Leak-proof design with 3-year warranty included

➤ UL listed and factory fresh for guaranteed quality


📦🚀 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 | 159 Ah

Terminal Type

Internal Thread

Replacement Enersys HX540-12FR Battery — Compatible with Enersys HX540-12FR UPS

This compatible replacement UPS battery for the Enersys HX540-12FR brings high-rate discharge capability and proven sealed lead acid reliability to your critical power system. Engineered to meet demanding UPS requirements, the unit offers robust standby life and stable operation for sensitive electronics and power infrastructure. If you need a dependable, high-performance UPS battery for the HX540-12FR application, this replacement is built to deliver.

Key Specifications

  • High-rate discharge design
  • 539 Watts per cell on 15-min rate at 1.67 Volts
  • Self-discharge rate < 3% per month
  • Expected life up to 10 years in standby use
  • Up to 300 cycles at 100% discharge in cycle service
  • No-leak construction — can be operated in any position
  • Absorbent Glass Mat Technology (AGM)
  • ABS (UL94 V-0) flame retardant case
  • Spill proof construction
  • Brand New, Factory Fresh
  • Superior Performance Guaranteed
  • UL Listed
  • 3 Year Warranty
  • Professionally tested and packaged
  • Manufacturer/Distributor: SigmasTek
  • Voltage: 12 Volts
  • Capacity: 159 Ah
  • Terminal: Internal Thread
  • Compatible Brand/Model: Enersys HX540-12FR

Benefits

  • Robust durability — AGM construction with an ABS UL94 V-0 flame retardant case offers mechanical and thermal protection for stable long-term service.
  • Extended lifespan — Low self-discharge and up to 10 years standby life make this a long-lasting battery choice for maintaining readiness in UPS environments.
  • High-performance capability — The high-rate discharge design and strong watt-per-cell rating ensure reliable power delivery for brief high-load events and UPS transfer periods.
  • Wide applicability — Ideal for UPS applications including Enersys HX540-12FR systems, emergency backup power, and battery-powered equipment needing dependable discharge characteristics.
  • Quality assurance — Professional testing, packaging, UL listing, and a 3 year warranty provide confidence for mission-critical installations.

Restore full backup capacity to your Enersys HX540-12FR UPS with this replacement UPS battery. Order now to get a high-performance, long-lasting battery with reliable shipping and support.


Payment & Security

Payment methods

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