FirstPower FP645K Compatible Replacement Battery 1.59 lb
— Ready to ship immediately
Check that your old battery model number and device model to match our description. This makes sure they work together.
We ship your order same day if you buy it before 4 PM EST.
FirstPower FP645K Compatible Replacement Battery is backordered and will ship as soon as it is back in stock.
Let customers speak for us
Send Your Battery Photo
Expert Technician Help
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.
POST YOUR BATTERY IMAGE
Product & Solutions Expert
✉ sales@batteryweb.com
Battery Care Tips
Battery Care Tips
🔹 Getting Started
Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.
🔹 Keep It Healthy
Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.
Delivery and Shipping
Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
Disclaimer
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.
Volts & Amps
6 Volts | 4.5 AH
Terminal Type
F1
FirstPower FP645K Replacement Battery — Compatible with FirstPower FP645K
Replace your original battery with a reliable, factory-fresh FirstPower FP645K replacement battery engineered to meet or exceed OEM specifications. This high-performance replacement battery provides the compatibility, consistency, and long-term reliability you need for backup power and everyday applications. With AGM technology and a maintenance-free design, the FP645K replacement is built to perform in demanding environments while remaining safe and easy to use.
Key Specifications
- Model Compatibility: FirstPower FP645K
- Brand: SigmasTek
- Voltage: 6 Volts
- Capacity: 4.5 AH
- Technology: Absorbent Glass Mat (AGM) Technology
- Design: Maintenance-Free with Spill Proof Construction
- Certifications: U.L. Recognized and CE Certified
- Condition: Brand New, Factory Fresh
- Warranty: 1 Year Warranty
Benefits
This replacement battery is designed for longevity and dependable operation. AGM construction enhances charge acceptance and resistance to vibration, contributing to a long-lasting battery life and reliable performance under repeated cycling. The maintenance-free design and spill-proof housing minimize upkeep and provide safe operation for indoor and portable applications. As a high-performance battery, the FP645K replacement maintains consistent power delivery for sensitive equipment and critical backup tasks.
Common uses include UPS backup systems, emergency lighting, alarm and security equipment, medical devices, and small portable tools—wherever a dependable 6V supply is required. Safety certifications like U.L. Recognition and CE conformity ensure this unit meets quality and safety expectations. Being brand new and factory fresh with a 1 year warranty, the battery offers value and peace of mind over cheaper, uncertified alternatives.
If you need a replacement battery that balances affordability with reliable performance for your FirstPower FP645K, this unit is an ideal match. It provides consistent output, fast recovery after discharge, and dependable support for essential systems.
Ready to replace your worn battery? Purchase this FirstPower FP645K replacement battery now and secure reliable, long-lasting power for your equipment.
Technical Specifications
Product Highlights
- Brand Replacement : FirstPower FP645K Battery
- Manufacturer: SigmasTek
- Product Type: SLA Batteries
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
