What the FJ ProMax Adapter Does for Your FJ800
The Westcott FJ ProMax AC/DC Battery and Power Adapter is designed to keep your FJ800 strobe running longer during demanding shoots. It combines a high-capacity 148Wh, 5000mAh battery with AC/DC flexibility, so you can work in the studio or on location without constantly swapping batteries or hunting for a wall outlet.
This adapter is compatible with the FJ800, FJ400 II, and FJ250 strobes from the FJ Wireless system. For FJ800 users, it delivers up to 500+ flashes per charge, which means fewer interruptions and a smoother workflow during events, portraits, or commercial work.
Setting Up the FJ ProMax with Your FJ800
The setup is straightforward and requires no special tools. Follow these steps to get your strobe powered and ready.
- Connect the Power Adapter: Plug the supplied power adapter and cord into the FJ ProMax battery. The adapter converts mains AC power to DC for charging and direct operation.
- Attach the Battery to Your FJ800: Slide the FJ ProMax onto the battery mount of your FJ800 strobe. It locks into place just like a standard battery pack. The compact design (2.2 lbs / 1.0 kg) keeps your setup portable.
- Power On and Verify: Turn on the strobe. The FJ ProMax has LED charge indicators that show remaining battery level at a glance. You can start shooting immediately.
- Use AC/DC Trickle-Charge (Optional): If you have access to mains power, you can plug the adapter into a wall outlet while the battery is attached to the strobe. The built-in trickle-charge feature runs the light and charges the battery simultaneously, so you can keep shooting without draining the pack.
Charging and Runtime Expectations
The FJ ProMax recharges fully in about 3 hours, minimizing downtime between sessions. For an FJ800, you can expect over 500 full-power flashes per charge. The battery is rated for more than 300 charge cycles, so it will last through years of regular use.
LED indicators on the battery let you check remaining power without guesswork. When the pack runs low, a full recharge is quick enough to fit into a lunch break or between setups.
Westcott FJ ProMax at a Glance
- Westcott FJ ProMax AC/DC Battery and Power Adapter for FJ800, FJ400 II, FJ250: High-capacity 148Wh, 5000mAh battery Provides enough power for over 500 flashes on the FJ800, reducing battery swaps during long shoots.
Westcott FJ ProMax AC/DC Battery and Power Adapter for FJ800, FJ400 II, FJ250 - Westcott FJ ProMax AC/DC Battery and Power Adapter for FJ800, FJ400 II, FJ250: AC/DC operation with built-in trickle-charge capability Lets you run the strobe and charge the battery at the same time when connected to mains, ideal for studio work.
- Westcott FJ ProMax AC/DC Battery and Power Adapter for FJ800, FJ400 II, FJ250: Compact and portable at 2.2 lbs (1.0 kg) Light enough to carry in a camera bag without adding significant weight to your kit.
- Westcott FJ ProMax AC/DC Battery and Power Adapter for FJ800, FJ400 II, FJ250: Over 300 charge cycles for long-term reliability The battery is built to last through years of regular use, making it a worthwhile investment for frequent shooters.
What to Keep in Mind
The FJ ProMax is designed specifically for the FJ800, FJ400 II, and FJ250. It won't work with other Westcott strobes or third-party lights. The supplied evidence does not confirm compatibility with any other models, so check your strobe model before purchasing.
While the battery is powerful, it's not a replacement for a dedicated AC power supply if you need unlimited runtime in a studio. The trickle-charge feature helps, but you'll still need access to a wall outlet to keep charging during extended sessions.
If you're shooting on location without mains power, the FJ ProMax is a solid choice for getting through a full day of event or portrait work without swapping batteries.
