Product Information
Ultimate Power for Your Creative Vision
Transform your photography experience with the Westcott FJ ProMax AC/DC Battery & Power Adapter, a powerhouse designed to keep your FJ400 II and FJ800 strobes performing at their peak. With the ability to deliver over 1,000 full-power flashes per charge for the FJ400 II and 500+ for the FJ800, this high-capacity battery ensures you stay ready to capture every perfect moment, from vibrant studio portraits to sprawling outdoor group shots.

Engineered for Endurance
Built to handle the demands of long and intensive shoots, the FJ ProMax Battery boasts an impressive 148Wh, 5000mAh capacity. Its rugged yet portable design, weighing just 2.2 lbs (1.0 kg), strikes the ideal balance between durability and convenience, making it an essential companion for photographers on the move. This battery is your steadfast ally for consistent power, wherever your creativity takes you.
Quick Recharge, Reliable Power
Downtime is minimized with a swift 3-hour recharge time, letting you focus on creating without interruptions. Equipped with LED charge indicators, the FJ ProMax Battery keeps you informed of its status at a glance, ensuring you’re always prepared for the next shot. It's the dependable solution for continuous and efficient power delivery during extended sessions.
Versatile AC/DC Functionality
Designed for flexibility, the FJ ProMax Battery features advanced AC/DC capabilities, including a built-in trickle-charge function. This ensures that your gear remains powered and ready even during prolonged shoots, with optimized performance when the battery is above 25%. It’s the perfect blend of innovation and reliability for professional photographers.
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FJ ProMax AC/DC Battery
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Power Adapter & Cord
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Limited 1-Year Warranty
| Battery | |
|---|---|
| Flashes per Charge | FJ400 II: 1000+ at Full Power FJ800: 500+ at Full Power |
| Battery Type | FJ ProMax AC/DC Li-ion Battery |
| Battery Capacity | 148Wh, 5000mAh |
| Battery Voltage | 29.6V |
| Charge Power | DC 33.6V, 2A |
| Battery Removable | Yes |
| Charge Time | ~3.0 Hours |
| Charge Cycles | 300+ (@80% after 300 cycles) |
| AC Power Requirement | Battery Level ≥ 25% |
| Electrical | |
|---|---|
| Battery Type | AC/DC Lithium-Ion |
| Battery Mount | FJ800 Strobe; FJ400 II Strobe |
| Cable Port | Barrel (Charging) |
| Cooling | Passive |
| Operating Temp. | 32° to 113°F / 0° to 45°C |
| Power Cord | 9.5' / 2.9m |
| Power Region | Type B (US) |
| Power Supply | 100-240 VAC, 50/60 Hz 1.5A Max |
| Certifications | FJ Pro Battery: CE, RoHS AC Adapter: CE, cETLus, RoHS |
| General | |
|---|---|
| Compatibility | FJ800 Strobe; FJ400 II Strobe |
| Dimensions | 4.2 × 3.9 × 3.5" / 10.7 × 9.9 × 8.9 cm |
| Weight | 2.2 lbs / 1.0 kg |
| Materials | Nylon, Plastic, Aluminum, Rubber, Electrical Components |




