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SigmasTek  |  SKU: BW-3951

ONEAC ONM300I-SI UPS High Performance Replacement Battery

Sale price $14.91 USD Regular price $18.84
Shipping calculated at checkout.

➤ OEM SLA specs met for ONEAC ONM300I-SI replacement battery

➤ Advanced AGM technology for long-lasting power

➤ Maintenance-free, spill-proof design for convenience

➤ U.L. and CE certified for trusted safety and quality

➤ Backed by a 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 | 7.5 Ah

Terminal Type

F2

Replacement ONEAC ONM300I-SI UPS Battery — Compatible with ONEAC ONM300I-SI

Replace your failing battery with a reliable replacement UPS battery engineered for the ONEAC ONM300I-SI. This high-performance UPS battery delivers consistent, maintenance-free power and dependable protection for your uninterruptible power supply. Designed to meet or exceed OEM SLA specifications, the SigmasTek 12V 7.5Ah F2 battery provides the compatibility and reliability you need for critical systems, offering a long-lasting battery solution for UPS systems, emergency power, and battery-powered tools.

Key Specifications

  • Compatible Model: ONEAC ONM300I-SI
  • Brand: SigmasTek
  • Voltage: 12 Volts
  • Capacity: 7.5 Ah
  • Terminal Type: F2
  • Battery Technology: Absorbent Glass Mat (AGM) Technology
  • Design: High Rate Discharge Design
  • Maintenance: Maintenance-Free Design with Spill Proof Construction
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year Warranty
  • Applications: Emergency Power Supply, Battery Powered Tools, UPS

Benefits

  • Durability and Safety — Built with AGM technology and spill-proof construction, this replacement UPS battery is sealed and maintenance-free for safe, reliable operation in enclosed UPS cabinets and remote installations. U.L. recognition and CE certification ensure it meets industry safety standards.
  • Long Life Performance — The high rate discharge design provides consistent current delivery under load, helping extend the operational lifetime of the battery in frequent-use scenarios and making it a long-lasting battery option for your ONEAC ONM300I-SI unit.
  • High-Performance UPS Battery — Deliver stable backup power when you need it most. This SigmasTek cell is optimized for UPS applications, providing rapid discharge capacity for short-duration high-power events and superior recharge acceptance.
  • Maintenance-Free Convenience — No topping up or regular service required. The sealed AGM design keeps terminals clean and reduces downtime, making it ideal for emergency power systems, telemetry cabinets, and battery-powered tools.
  • Versatile Applications — Perfect for replacing the OEM battery in ONEAC ONM300I-SI UPS units, this battery is also suitable for emergency power supply systems and battery-operated tools that require a stable 12V 7.5Ah source.
  • Value and Confidence — Brand new, factory-fresh units backed by a 1 year warranty give you peace of mind and protect your investment in mission-critical equipment.

Ready to restore dependable backup power to your ONEAC ONM300I-SI? Order this high-performance, long-lasting replacement UPS battery today and enjoy fast, compatible power protection backed by a 1 year warranty. Click to purchase now and keep your systems running.



Payment & Security

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