FX3 on a Gimbal: 4+ Extra Hours of Power With a Cheap Power Bank Mod

November 9, 2026

The Sony FX3 is a great gimbal camera until the battery dies mid-take. Swapping an NP-FZ100 on a balanced gimbal means stopping, pulling the camera apart and rebalancing. My fix costs less than a spare Sony battery: a 10,000 mAh USB-C power bank clamped under the camera, plugged straight into the FX3's USB-C port.

In my own testing, recording continuously with a fully charged NP-FZ100 in the camera, the power bank added more than 4 hours of run time. And when it runs low, I swap the power bank, not the camera battery, and the rig stays balanced.

The parts

• Power bank: I use a Miady 10,000 mAh, 20W USB-C PD bank with a % display. It isn't sold anymore, so see "Choosing a power bank" below.
• Clamp: NICEYRIG aluminum power bank clamp (540). It's listed for the DJI RS 2, RS 3 and RS 3 Pro and holds banks 50–88 mm wide. It works on my RS 4 Pro.
• Cable: a short, flat right-angle USB-C to USB-C cable (1 ft, 90°, 60W). This cable matters more than it looks: the right-angle plug and flat cable stay out of the way of the FX3's flip-out screen, so you can still swivel the monitor. A regular straight USB-C cable sticks out right where the screen needs to move.
• Adapter: a U-shaped (180°) USB-C adapter. This one fits my power bank's port position so the plug sits flush and the display stays readable. With a different bank, you may need a different adapter or none at all.
• Cable lock: a 1/4"-20 thumb screw and a small rubber washer.
• Already on my rig: Sony FX3, Kondor Blue cage, DJI RS 4 Pro.

Choosing a power bank. My exact bank is discontinued, so you'll be shopping. Look for:

• Enough power: USB-C PD output, ideally 27W or more (see the power note below), and around 10,000 mAh.
• Weight: everything you add is more for the gimbal to carry. Check the weight before you buy.
• Where the USB-C port is: this decides how clean the setup looks. Picture the cable coming out of that port on your rig, then pick an adapter (or none) that keeps it as flush and streamlined as possible. Get creative.
• A good grab point: a flat, regular shape the clamp can hold. Most banks have one.

STEP 1Remove the FX3's port door

This is personal preference, but I take off the door on the left side of the FX3 that covers the USB-C port. With it gone, the right-angle cable plugs in cleanly and nothing presses against the plug when the gimbal moves. Here's a good walkthrough: How to remove the port doors on the Sony FX3 (YouTube). Keep the door so you can put it back.

STEP 2Plug in and lock the cable

Plug the right-angle end into the FX3's USB-C port. Then lock it down: I thread a 1/4" screw with a rubber washer into the cage right next to the port, so the washer holds the cable in place. The washer grips without crushing. That's the trick: enough pressure to keep the cable from pulling out, not so much that it damages the wire.

Don't overthink the exact spot. That 1/4" hole is just where my Kondor Blue cage happens to have one. Your cage or rig will have its own; any solid grab point near the port does the job.

STEP 3Mount the power bank

Mount the NICEYRIG clamp under the camera plate and slide the power bank in with the display facing you. One honest warning: the clamp is hard to tighten and loosen, but it can be done with the camera on the gimbal.