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SigmasTek  |  SKU: BW-3963

ONEAC ON900I-SN UPS High Performance Replacement Battery

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

➤ Advanced AGM technology for enhanced battery life

➤ Designed for high rate discharge in critical power applications

➤ Maintenance-free and spill-proof for worry-free operation

➤ U.L. recognized and CE certified for safety assurance

➤ Backed by 1 year warranty, fully compatible with ONEAC ON900I-SN


📦🚀 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 ON900I-SN Uninterruptible Power Supply (UPS) Battery

Specifically engineered for the ONEAC ON900I-SN, this replacement UPS battery restores dependable runtime and robust performance. The SigmasTek replacement matches or surpasses OEM SLA specifications, offering a maintenance-free, spill-proof solution that keeps your ONEAC ON900I-SN UPS ready for outages. With reliable construction and certified safety, this battery is a trusted choice for critical backup power applications.

Key Specifications

  • Compatible Model: ONEAC ON900I-SN
  • Brand: SigmasTek
  • Voltage: 12 Volts
  • Capacity: 7.5 Ah
  • Terminal Type: F2
  • Battery Type: SLA (Sealed Lead Acid)
  • Technology: Absorbent Glass Mat (AGM)
  • Design: High Rate Discharge Design
  • Maintenance: Maintenance-Free, Spill Proof Construction
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year Warranty
  • Typical Applications: Emergency Power Supply; Battery Powered Tools

Benefits

  • Built for Reliability: The AGM construction and sealed, spill-proof housing make this replacement UPS battery a rugged, dependable option for ONEAC ON900I-SN units in varied environments.
  • Long-Lasting Power: As a long-lasting battery with maintenance-free operation, it minimizes upkeep while maximizing uptime for your UPS and connected devices.
  • High-Performance Output: The high rate discharge design supports sudden power draws and emergency loads, making it a high-performance UPS battery ideal for protecting essential systems.
  • Safety Assured: U.L. recognition and CE certification provide assurance that this battery meets recognized safety and quality benchmarks.
  • Direct Replacement: Delivered brand new and factory fresh with a 1-year warranty, the SigmasTek 12V 7.5Ah F2 battery is a straightforward, compatible swap for the ONEAC ON900I-SN.
  • Versatile Use Cases: Suitable for UPS backup, emergency power, and battery-powered tools where a reliable, maintenance-free energy source is required.

Ensure your ONEAC ON900I-SN maintains dependable backup power with this replacement UPS battery. Buy the SigmasTek 12V 7.5Ah replacement now to upgrade to a high-performance UPS battery and secure continuous protection for your equipment.



Payment & Security

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