CAME-TV BOLTZEN B-30 Replacement Battery 7.4V 4400mAh

CAME-TV BOLTZEN B-30 Series — 7.4V Li-ion Replacement Battery

This 7.4V 4400mAh (32.56Wh) lithium-ion battery fits the CAME-TV BOLTZEN B-30, BOLTZEN B-30S, and ULTRA SLIM 576B 3200–5800K LED panel lights. These are compact, daylight-balanced fixtures used on film, video, and photography productions where portable power is critical. Same voltage rail, same form factor — slides in where the original battery sat.

• BOLTZEN B-30, B-30S, and ULTRA SLIM 576B compatibility: All three fixtures share the same 7.4V power architecture and battery bay dimensions. The BMS in each unit reads voltage and draw rate — this cell meets both thresholds, so the light powers on and regulates output the same way it does with the original battery.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the B-30 platform. The BMS accepted the cell without fault flags, maintained stable current delivery across the fixture's full brightness range, and protected-cell shutdown occurred correctly at low-voltage threshold — no mid-shoot cutoffs.
• LED panel draw management: At full brightness, the B-30 draws harder than the rated average — especially when driving higher colour temperatures. Keep a second charged cell on set rather than pushing the first cell into deep discharge territory repeatedly. Shallow cycling preserves cell capacity over a longer production run.

Why the BOLTZEN B-30 dims or flickers near end of charge

The B-30's onboard driver regulates LED current, but it depends on the battery holding above a minimum voltage threshold — typically around 6.4V for a 7.4V nominal cell. As the cell drops toward that floor, the driver can no longer maintain full regulated output. The result is visible dimming or a slow flicker that gets worse at high brightness settings. Swap the cell before it reaches that point; running a Li-ion cell below 6.0V repeatedly damages capacity faster than normal use.

Battery reads full on the indicator but the panel cuts out early

The BOLTZEN B-30's LED fuel gauge reads voltage, not true state of charge — a cell that's been deep-discharged multiple times can sit at a surface voltage that looks healthy but collapses quickly under load. This is called voltage rebound, and it fools simple indicator circuits. If your panel cuts out while the indicator still shows partial charge, the old cell has lost usable capacity even if the resting voltage appears normal. A fresh cell at 7.4V nominal will hold stable voltage under the fixture's draw and match the indicator reading to actual runtime.