12V 500mA Automatic Float Charger for SLA Batteries, 2.5mm x 5.5mm Center Positive | FC-1250B
12V 500mA Floating-Smart Battery Charger | FC-1250B
The FC-1250B is a fully automatic 12V DC 500mA (0.5A) floating-smart charger engineered exclusively for 12-Volt Sealed Lead-Acid (SLA) batteries. Once your battery reaches full capacity, the FC-1250B automatically transitions from fast charge to a safe, continuous float (trickle) maintenance mode — so you can leave it connected indefinitely without risk of overcharging. It's the set-it-and-forget-it solution for backup power systems, alarm panels, UPS units, and mobility scooters.
Key Features & Specifications
- Output: 12V DC @ 500mA (0.5A max); no-load voltage ~13.75VDC
- Input: 100–240V AC, 50/60Hz (20W) — universal input, works worldwide
- Connector: 2.5mm x 5.5mm barrel plug, center positive (+)
- Charging Mode: Automatic fast charge → float (trickle) maintenance
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LED Indicator: Dual-color intelligent status display
- RED: Fast Charge mode (>25% of max charge rate)
- GREEN: Float/Ready mode (<25% rate — battery full)
- Safety & Compliance: CuL Approved, RoHS compliant
- Battery Compatibility: Sealed Lead-Acid (SLA) / VRLA only
Common Use Cases & Compatible Applications
- Backup power systems and UPS battery maintenance
- Home and commercial security alarm panel batteries
- Emergency lighting and exit sign battery packs
- Mobility scooters and electric wheelchairs (12V SLA)
- Marine and RV auxiliary battery maintenance
- Any 12V SLA battery requiring long-term float maintenance charging
Accessory: Need Alligator Clips?
Pair the FC-1250B with our DC Barrel Plug Adapter to Alligator Clips (Part RC-Y2C) to connect directly to battery terminals without soldering.
Frequently Asked Questions
Q: Can I use this charger with Lithium, NiMH, or NiCd batteries?
A: No. The FC-1250B is designed exclusively for 12V Sealed Lead-Acid (SLA/VRLA) batteries. Using it with other battery chemistries can cause damage or safety hazards.
Q: Is it safe to leave connected long-term?
A: Yes. Once the battery is fully charged, the charger automatically switches to float maintenance mode, which is safe for indefinite connection.
Q: What does the no-load voltage of ~13.75VDC mean?
A: This is the open-circuit voltage when no battery is connected. Under load (charging a battery), the voltage will settle to the rated 12V output.
Q: What connector size does this use?
A: 2.5mm x 5.5mm center-positive barrel plug. Verify your battery charger port or adapter matches this size before ordering.
