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Enersys  |  SKU: BW-1903

FIAMM FLX500 UPS High Performance Replacement Battery

Sale price $533.32 USD Regular price $755.53
Shipping calculated at checkout.

➤ Designed for high-rate discharge in UPS applications

➤ Minimal self-discharge extends standby life up to 10 years

➤ Operates leak-free in any position with spill-proof technology

➤ Constructed with durable ABS flame retardant case

➤ Tested, UL listed, and backed by a 3-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 | 145 Ah

Terminal Type

Internal Thread

Replacement FIAMM FLX500 - Compatible with FIAMM FLX500 UPS

When you need dependable backup power with proven longevity, the replacement FIAMM FLX500 is a robust, maintenance-free option. This replacement UPS battery is engineered for high-rate discharge performance and reliable standby operation, making it an excellent choice for UPS systems, emergency power, and other critical power backups. The FIAMM FLX500 delivers consistent output and construction designed to minimize leaks and maintenance while maximizing operational life.

Key Specifications

  • Model: FIAMM FLX500
  • 491 Watts per cell on 15-min rate at 1.67 Volts
  • Self-discharge: Less than 3% per month
  • Expected life: Up to 10 years in standby use
  • Cycle life: Up to 300 cycles at 100% discharge (cycle service)
  • Construction: No-leak construction; can be operated in any position
  • Technology: Absorbent Glass Mat (AGM) Technology
  • Case: ABS (UL94 V-0) flame retardant case
  • Condition: Brand New, Factory Fresh
  • Spill Proof Construction
  • Warranty: 3 Year Warranty
  • Safety Listing: UL Listed
  • Packaging: Professionally tested and packaged
  • Shipping: Orders for in-stock items typically shipped within 24 hours
  • Additional text from product: Enersys
  • Voltage/Ah text from product: 12 Volts 145 Ah
  • Terminal: Internal Thread
  • Brand text from product: FIAMM FLX500

Benefits

  • Durability: AGM design and an ABS UL94 V-0 flame retardant case deliver reliable mechanical protection and safe operation in commercial and industrial environments.
  • Long life: Very low self-discharge and up to 10 years standby expectancy mean fewer replacements and dependable readiness—true long-lasting battery performance.
  • High performance: The high-rate discharge construction and 491 W per cell rating (15-min @ 1.67 V) ensure steady power under heavy loads—ideal as a high-performance UPS battery.
  • Low maintenance: Sealed, spill-proof design and the ability to operate in any position reduce installation constraints and ongoing maintenance needs.
  • Broad application: Perfect for UPS backup, emergency power systems, telecom, security, and other equipment requiring reliable battery backup.
  • Quality assurance: Brand new condition, UL listing, 3-year warranty, and professional testing and packaging give you confidence in every replacement UPS battery purchase.

Protect your critical systems with the replacement FIAMM FLX500 high-performance UPS battery—order now to secure reliable, long-lasting battery backup for your UPS and emergency power needs.


Payment & Security

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