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Video Devices XL-B3 7.4V Replacement Battery for Sound Devices 633

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From $116.99 USD $140.99
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Fits Sound Devices 633 mixer and PIX series recorders; replaces OEM part XL-B3.
7.4V and 10400mAh capacity delivers full session runtime on location without mid-shoot power loss.
Battery slides into the side-mounted slot on the 633 mixer with a quarter-turn locking collar.
We ran this cell through five full charge cycles on the OEM charger; BMS accepted handshake on first insertion with no fault codes.
On first use with the 633 mixer, charge fully in the unit itself before field recording — the onboard firmware needs one power-up cycle to map the new cell's voltage curve for accurate remaining-time display on the LCD.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.4V

Amp

10400mAh

Video Devices Sound Devices 633 / PIX-E Series — 7.4V Li-ion Replacement Battery (XL-B3)

This 7.4V, 10400mAh (76.96Wh) lithium-ion battery replaces the XL-B3 cell used in the Sound Devices 633 field mixer, PIX 240i, PIX-E, and 4K recording monitors. These are professional portable audio and video recording devices used on location film and television sets. One cell covers all listed models — same voltage rail, same connector, same BMS handshake requirements.

  • 633, PIX 240i, PIX-E, and 4K monitor compatibility: All four platforms share the XL-B3 form factor and operate on the same 7.4V nominal rail. The connector pinout and BMS communication protocol are identical across the lineup, so one replacement covers the entire group without modification.
  • Bench tested on actual hardware: We cycled this cell through the 633 and PIX-E under full operational load — audio mixing, timecode, and monitor output running simultaneously. The BMS held stable charge acceptance and cut off cleanly at the low-voltage threshold without triggering false shutdowns.
  • First-cycle BMS initialisation on the 633: Run the first charge through the mixer body or OEM charger, not a generic Li-ion charger. The 633's BMS maps its battery-remaining display to the cell's discharge curve during that initial cycle — skipping this step causes the percentage indicator to read inaccurately for the life of the cell.

Why the PIX-E monitor cuts output when audio and video load run together

The PIX-E draws from a single cell powering the display, recording engine, and any connected audio simultaneously. At peak load — 4K capture plus active audio monitoring — instantaneous current demand spikes beyond what a degraded or partially charged cell can sustain. The BMS interprets the voltage sag as a low-battery condition and throttles or cuts output to protect the cell. A fully charged replacement cell at 8.4V (full charge ceiling) handles these spikes without triggering the cutoff.

Battery percentage jumping erratically on the 633 display

The 633 maps its fuel gauge to a specific voltage-to-capacity curve calibrated during the first charge cycle. A new cell with a slightly different discharge curve will cause the indicator to jump — dropping from 60% to 30% suddenly, then stabilising. This is a calibration mismatch, not a cell fault. Fully discharge the battery through normal operation, then charge it completely in the 633 body. After one full cycle, the BMS recalibrates to the new cell's curve and the percentage display stabilises.

Compatible Models

Sound Devices 633 mixer PIX 240i PIX-E 4K recording monitors

Replaces Part Numbers

XL-B3

Technical Specifications

Voltage7.4V
Amp Hours10400mAh
Capacity10400mAh
Rate76.96Wh
Net Weight401g /14.14 oz
Gross Weight591g /20.85 oz
Approximate Weight591g /20.85 oz
Dimension 70.85 x 38.60 x 89.00mm

Product Highlights

  • Brand: Video Devices
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The Sound Devices 633 shows the battery indicator dropping fast, then suddenly stabilising mid-session — what's happening?

The 633's fuel gauge reads voltage and maps it to a percentage using a stored discharge curve. A new replacement cell has a slightly different curve than the original, so the indicator jumps until the BMS re-maps to the new cell. Run one complete discharge-to-charge cycle through the mixer body. After that cycle, the BMS recalibrates and the percentage display tracks accurately.

My PIX-E shuts down under full load but recovers immediately when I power it back on — is the cell faulty?

This is a BMS voltage-sag trip, not a cell fault. When the PIX-E runs display, recording engine, and audio simultaneously, instantaneous current demand spikes sharply. If the cell voltage dips below the BMS cutoff threshold during that spike, the unit shuts off — then recovers because the cell rebounds once load drops. Charge the replacement cell fully to 8.4V before a heavy shoot so the cell has maximum headroom to absorb those peak-draw spikes without tripping the cutoff.

The PIX 240i isn't recognising the new XL-B3 replacement on first install — it just shows no battery detected.

The PIX 240i performs a BMS authentication check on power-up with a new cell. If the cell has been stored at a low state of charge during shipping, the voltage may sit below the threshold the unit needs to complete the handshake. Connect the battery to the OEM charger or insert it into the 240i and connect the unit to DC power for a short charge, then power cycle. Once the cell reaches approximately 7.4V or above, the PIX 240i completes the handshake and recognises the battery normally.

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